Casting, Solidification, Aluminum, Physical Metallurgy, Mechanical Metallurgy, Strengthening Model, Aluminum Wrought Alloys, Aluminum 7xxx Series, Al-Zn-Mg-Cu / Over the past decades, researchers in casting fields, especially in semi-solid metal state, have endeavored to find new ways to enable the Al wrought alloys of casting using the conventional casting processes; mainly in order to improve the product properties and decrease the product cost. The thixoforming and rheocasting processes have been presented as ways by which the microstructure of Al-base wrought alloys can be changed into non-dendritic, which in turn can lead to improvement to the mechanical properties. This can be because the effect of the non-dendritic microstructure on the mechanical properties of the material. Unfortunately, these processes have proved to be cost prohibitive and be a bit complicated for commercial applications. Further, conventional casting of Al-base wrought alloys along with their superior properties and performance have been a challenge for foundry industry due to the main disadvantage of hot tearing or hot cracking during solidification process. This can render the cast component ineffective. To overcome the disadvantages of thixoforming and rheocasting processes, Controlled Diffusion Solidification (CDS) process was innovated mainly to enable casting of aluminum wrought alloys with a non-dendritic morphology of the primary Al phase in the resultant cast microstructure and thus alleviating the problem of hot tearing and obtaining a cost effective product with improved mechanical properties. The CDS is a simple process involving mixing of two precursor alloys of different thermal masses (temperature and solute) and subsequently casting the resultant mixture of the desired solute composition and temperature as a near net shaped cast product. The process can easily be commercialized with a marginal capital cost required for set up such as the addition of an extra holding furnace. Further, the CDS process would prove itself to be unique in its ability to cast Al-based wrought alloys into near net shaped components without additional processes and cost. The originality of this study is to present a viable casting process for the Al-7xxx wrought alloys (Al-Zn-Mg-Cu); by which the Al-7xxx family alloys are presented in cast condition to have an acceptable uniaxial property range that is comparable with their wrought counterparts. This study presents the process and alloy parameters necessary for the casting of Al-7xxx wrought alloys (Al-Zn-Mg-Cu), by using the CDS process coupling with tilt pour gravity casting (TPGC) machine. The uniaxial tensile mechanical properties of several Al-7xxx CDS castings under various heat treatment conditions, namely, solutionizing (T4), peak aged (T6) and annealing (O), necessary for development of an ageing process on the material were investigated and presented. The tilt pour gravity casting process coupled with the CDS technology was employed to demonstrate the ability to cast Al-7xxx wrought alloys into high integrity components with high strength and ductility. The microstructure characterization was carried out by Electron Microscopy (TEM, SEM and EDS) and DSC test experiments for all the as cast (F), T4, T6 and anneals (O) conditions of the CDS cast components. Also, the predictive capabilities for the yield strength of Al 7xxx alloys CDS cast components was investigated using structural-properties modeling for the various strengthening effects that are recently proposed specifically for the Al-7xxx wrought counterparts. The study has successfully led to a more in-depth understanding of the innovative CDS casting process by applying it to several compositions of Al-7xxx wrought alloys in an industrial scale CDS casting experiments, using tilt pour gravity casting (TPGC) machine. This will hopefully lead us to a clearer path towards commercializing the CDS process and obtaining a viable casting process for Al-base wrought alloys into near net shape components without much change to economics of the casting process. / Dissertation / Doctor of Philosophy (PhD) / Casting, Solidification, Aluminum, Physical Metallurgy, Mechanical Metallurgy, Strengthening Model, Aluminum Wrought Alloys, Aluminum 7xxx Series, Al-Zn-Mg-Cu

京都大学 / 新制・課程博士 / 博士(工学) / 甲第24231号 / 工博第5059号 / 新制||工||1790(附属図書館) / 京都大学大学院工学研究科材料工学専攻 / (主査)教授 乾 晴行, 教授 田中 功, 教授 安田 秀幸 / 学位規則第4条第1項該当 / Doctor of Philosophy (Engineering) / Kyoto University / DFAM

The current work investigates how the interactions among constituent elements in high entropy alloys or complex concentrated alloys (HEA/CCAs) can lead to lattice instability and local chemical ordering which in turn affects the microstructure and properties of these alloys. Using binary enthalpies of mixing, the degree of ordering in concentrated multi-component solid solutions was successfully tailored by introducing Cr, Al and Ti in a CoFeNi HEA/CCA. CoFeNi was selected as the base alloy to achieve a close to random solid solution as indicated by the near-zero binary enthalpies in CoFeNi alloy system. The room temperature tensile properties of these alloys with varied degree of ordering follow a consistent trend where yield stress increased with degree of ordering. This novel approach provides a new alloy design strategy to obtain controlled ordering tendencies and consequently targeted mechanical properties. Further studies on specific alloys have been conducted to utilize this ordering tendency in attaining precipitation strengthening. For this purpose, Al, Ti and Ni were selected to promote ordering and Co, Fe, and Cr were chosen to strengthen the solid solution matrix. In Al0.25CoFeNi HEA/CCA, the ordering tendency between Al and Ni results in a competition between two long-range ordered phases, L12 and B2. While homogenous L12 precipitation takes place at an annealing temperature of 500oC, heterogeneous B2 precipitation occurs at 700oC. At 600oC, this competition between L12 and B2 phases results in a novel nano-lamellar microstructure. The alternating lamellae are mainly FCC and BCC based whose morphology is similar to pearlite in steels. However, the FCC lamella is made up of FCC and L12 phases and the BCC lamella is made up of BCC and B2 phases. A different thermomechanical processing route can be used to obtain the same phase composition but distributed in a nano-grained fashion. This nano-grained microstructure exhibits the best strength-ductility combination in this alloy. Thermomechanical processing can also be used to engineer the transformation pathway of L12 from homogenous to discontinuous precipitation. The homogenous and discontinuous L12 precipitation has been investigated in two different alloys namely, Al0.2Ti0.3Co1.5CrFeNi1.5 and Al0.3Ti0.2Co0.7CrFeNi1.7. While discontinuous precipitation (DP) is generally considered deleterious to mechanical properties, the results from this study suggests that microstructures with DP perform better compared to homogenous L12 up to 500oC. However, beyond 500oC, microstructures with homogenous L12 appears to perform better than discontinuously precipitated FCC+L12 microstructure.

Parkour är i grunden en konstform som kan utövas i olika miljöer oavsett om det är på enparkouranläggning eller på offentliga platser. Att utföra parkour är konsten att hitta och använda föremålsom hinder eller hjälpmedel för träning och för att utveckla rörelser. Aktiviteten går ut på ta sig frånpunkt A till punkt B på det snabbaste, smidigaste och effektivaste sättet. Bortsett från att parkour idaganses som en laglig idrottslig aktivitet anses den fortfarande som en typ av vandalism. Vad kan det beropå? Det beror främst på att en del parkourister väljer att utföra parkour på offentliga platser istället förspecifikt anpassade platser. Vad är anledningen att välja offentliga platser? Problemet att utföra parkour på specifikt anpassade platser är att de antingen inte är anpassade till enstörre målgrupp eller så är de ensidiga och saknar variation. Med det sagt begränsas aktiviteten till attendast enstaka förmågor kan testas. Projektering av en tvåplans parkourbyggnad i betong med öppningi bjälklaget är ytterligare ett sätt att testa en förmåga inom aktiviteten. Att utföra en sådan byggnad medrätt redskap, utformning och konstruktionslösningar krävde därför vägledning från en arkitekt och enkonstruktör. I rapporten redovisas olika typer av stomplan och studier bakom förstärkningsåtgärder vid öppning ibjälklag, för att besvara frågan: hur kan en öppning förstärkas om den saknar stöd i närheten? Val avstomplan och förstärkningsmetod har tagit hänsyn till dimensionering för böjande moment, men ävenatt projektet handlar om nyproduktion och estetiska aspekter som examensarbetet grundar sig på. Äventekniska och ekonomiska synpunkter är avgörande faktorer för valet. Tre stomplaner analyserades, men endast en stomplan valdes ut för vidare undersökning. Underarbetsgången behandlas olika förstärkningsmetoder som förstärkning med krage i form av armering ochförstärkning för fri kant. Förutom studie av förstärkningsmetoder dimensionerades betongplattan i olikatjocklekar med hänsyn till armeringsbehov. Rapporten grundades på ett finita elementprogram, FEM-Design 3D Structure, som användes förframtagning av moment och tvärkraft för olika modeller. För att underlätta arbetet gjordes ett flertalförenklingar som raka väggar vid hörn, hålet betraktas som rektangulärt, hinder/väggar på plattantolkades som laster m.m. Målet med förenklingar var att minska felmarginal som uppkommer i finitaelementmodell som sedan påverkar resultatet. Den slutsats som kan dras från resultat i FEM-Design, var att öppningen sänkte moment i plattan. Detberodde på att med en projekterad öppning kunde plattan delas upp i två mindre spännvidder. Vidareeftersträvades en förstärkningsåtgärd som inriktas till att förstyva plattan vid de kritiska områden ochsamtidigt uppfylla kraven som examensarbetet grundar sig på. Resultatet visade att det går åt mindrearmering för att öka momentkapacitet än för att minska på dimensionerande moment. Det betyder attdet blir mer ekonomiskt att åstadkomma en högre bärförmåga genom att höja momentkapaciteten än attminska dimensionerande moment med olika förstärkningsmetoder. Det som uppvisade bäst resultat var“stomplan 2” och användning av finita elementstorlek 0,15 m. Med analys av armering m.h.t. plattansolika tjocklekar kunde tjockleken 325 mm säkerställas och valet av 300 mm med förstärkning för frikant kunde visas som det bästa alternativet av de undersökta plattorna. / In general parkour is a form of art that can be performed in many different locations such as parkourparks or public places. The art of parkour is to find and use different objects as obstacles or as asupplement for training and development of different moves. Despite the fact that parkour is a legalactivity, it is still considered to be a type of vandalism. What is the reason for that? It is due to the factthat practitioners of parkour prefer to exercise in public places rather than limiting themselves inspecifically designed ones. Why do practitioners opt for exercising in public places? Firstly, the problem with those places is that they are not adapted for adults or they are ill-equipped andlack variation. Therefore, an activity gets limited because only a few abilities can be worked on.Designing a two-story concrete building intended for parkour with a floor opening is another way totest ability to parkour. In order to design that kind of building with the right appliance, shape andconstructive solutions, assistance from an architect and a constructor is required. This report shows different types of frameworks and studies behind strengthening solutions for a flooropening to find an answer for the following question: how can a floor opening be strengthened withouthaving the support for it in close proximity? Decisions of the framework and strengthening method areprimarily considered by bending moment, but also new productions and aesthetics of the building, whatthis dissertation is based on. The technical and economical aspects are also important for this decision. Three frameworks are analyzed, however only one of them will be chosen for further analysis. Theworking process shows various strengthening methods, for example strengthening by reinforcing theshape of the collar and strengthening the free edges. In addition to the study of strengthening methodsfor the floor opening, the concrete slab is analyzed in different thicknesses by considering the need ofthe reinforcements. The design is based on a finite element software FEM-Design 3D Structure that was used for calculationof moment and shear forces. Some simplifications were made to lighten the work. For example, straightwalls in the corners, floor opening was considered as a square, obstacles/walls on the slab wereinterpreted as a load, and many more. The aim of the simplifications is to reduce the room for errors inthe finite element model which has a potential to affect the results later on. The conclusion on the outcome of the models in FEM-design was that the opening reduces moment inthe slab. As a result of a projected opening, the slab was separated into two smaller spans. It furtherrequired a strengthening method to increase stiffness in the critical area and at the same time archivethe criterium for this dissertation. The results have shown that it requires less reinforcement byincreasing moment of resistance than reducing dimensioning moment on slab. That means that it ismore economical to increase the moment of resistance than to increase stiffness around opening withdifferent strengthening methods. Framework No.2 and usage of mesh size 0,15 m have shown the bestresults in this report. Analysis of reinforcement based on slab thickness gave a result of 325 mm whichled to a choice of slab 300 mm with reinforcement for free edges as the best alternative.

京都大学 / 新制・課程博士 / 博士(工学) / 甲第23508号 / 工博第4920号 / 新制||工||1768(附属図書館) / 京都大学大学院工学研究科材料工学専攻 / (主査)教授 乾 晴行, 教授 安田 秀幸, 教授 辻 伸泰 / 学位規則第4条第1項該当 / Doctor of Philosophy (Engineering) / Kyoto University / DFAM

yes / This paper reports the testing of 11 reinforced concrete (RC) two-span beams strengthened in flexure with externally bonded carbon fiber-reinforced polymer (CFRP) sheets. The beams were classified into two groups according to the arrangement of the internal steel reinforcement. Each group included one unstrengthened control beam. The main parameters studied were the position, length, and number of CFRP layers. External strengthening using CFRP sheets was found to increase the beam load capacity. All strengthened beams exhibited less ductility compared with the unstrengthened control beams, however, and showed undesirable sudden failure modes. There was an optimum number of CFRP layers beyond which there was no further enhancement in the beam capacity. Extending the CFRP sheet length to cover the entire hogging or sagging zones did not prevent peeling failure of the CFRP sheets, which was the dominant failure mode of beams tested.

Detta arbete fokuserar på att förbättra en av ingångarna till Lindängeskolan i Malmö, detta i samarbete med Allaktivitetshusen. Allaktivitetshusen är en kommunal förening som erbjuder gratis aktiviteter för barn, ungdomar och vuxna för att bidra till ett mer aktivt liv i området. Förbättringen av skolans södra ingång ska bidra till att Allaktivitetshusen samt andra föreningar ska få en bättre upplevelse av platsen, då de använder ingången allra mest. Efter ett inspirerande studiebesök hos Allaktivitetshusen insåg jag betydelsen av deras arbete med att skapa en inkluderande och aktiv gemenskap för människor i alla åldrar. Utöver att bidra till hälsa och välbefinnande, tror jag att Allaktivitetshusens arbete kan fungera som en plattform för att skapa nya relationer och underlätta integration för personer med annan bakgrund. Under studiebesöket förklarades behovet av att förbättra ingången, som för nuläget är svår att lokalisera samt inte tillräckligt tydlig. Syftet med mitt examensarbete är att skapa ett välgenomtänkt gestaltningsförslag för att förbättra entrén, med hänsyn till föreningens och skolans behov och önskemål. Genom att integrera både teoretiska perspektiv och praktiska, strävar arbetet efter att skapa en mer välkomnande, tillgänglig och identifierbar ingång som speglar alla föreningars värderingar och bidrar till gemenskap och delaktighet för alla användare. / This work focuses on improving one of the entrances to Lindängeskolan in Malmö, this in collaboration with Allaktivitetshusen. Allaktivitetshusen is a municipal association that offers free activities for children, young people and adults to contribute to a more active life in the area. The improvement of the school’s southern entrance should contribute to Allaktivitetshusen and other associations getting a better experience of the place, as they use the entrance the most. After an inspiring study visit to Allaktivitetshusen, I realized the importance of their work in creating an inclusive and active community for people of all ages. In addition to contributing to health and well-being, I believe that Allaktivitetshusen’s work can serve as a platform for creating new relationships and facilitating integration for people with different backgrounds. During the study visit, the need to improve the entrance, which is currently difficult to locate and not clear enough, was explained. The purpose of my thesis is to create a well-thought-out design proposal to improve the entrance, taking into account the needs and wishes of the organization and the school. By integrating both theoretical perspectives and practical ones, the work strives to create a more welcoming, accessible and identifiable entrance that reflects the values of all associations and contributes to community and participation for all users.

Among the commercial aluminum alloys, aluminum 319 (Al-7wt%Si-4wt%Cu) type alloys are popularly used in automobile engine parts. These alloys have good casting characteristics and excellent mechanical properties resulting from a suitable heat treatment. To get a high strength in the 319 type alloys, grain refining, reducing the porosity, solid solution hardening, and precipitation hardening are preferred. All experimental variables such as solidification condition, composition, and heat treatment are influence on the precipitation behavior; however, precipitation hardening is the most significant because excess alloying elements from supersaturated solid solution form fine particles which act as obstacles to dislocation movement. The challenges of the 319 type alloys arise due to small size of precipitate and complex aging response caused by multi components. It is important to determine the chemical composition, crystal structure, and orientation relationship as well as precipitate morphology in order to understand the precipitation behavior and strengthening mechanism. In this study, the mechanical properties and microstructure were investigated using transmission electron microscopy and three dimensional atom probe tomography. The Mn and Mg effects on the microstructure and mechanical properties are discussed with crystallographic study on the iron intermetallic phases. The microstructural evolution and nucleation study on the precipitates in the low-Si 319 type aluminum alloys are also presented with sample preparation and analysis condition of TEM and 3DAP tomography.

Ni electrodeposition is a suitable process for producing thick deposits and thick metallic microstructures, especially for producing relatively deep micromoulds in Microsystems industry. Ni-P deposits, due to their better properties compared to Ni deposits – particularly high mechanical properties (hardness, wear resistivity), corrosion resistance, magnetic properties, a higher fatigue limit and lower macroscopic deformation – can be a very good alternative for producing Microsystems, especially for MEMS or Microengines. According to few limited literature and our primary investigations, dispersion coating and adding particle into the electrolyte can be considered as an approach in order to decrease the stress and ease the deposition of Ni-P galvanically. Although in the last decades the influence of particles embedment in the matrix by electroplating techniques have attracted the scientific interest, there are still contradictions among the research community concerning the influence of codeposited particles on the microstructure and strengthening properties of Ni-based composites coatings. In many cases, it is believed that the enhanced mechanical performance of the coatings is mainly caused by a change in the microstructure of the metal matrix and not so much by the presence of the particles themselves. In other words, the role of particle characteristics - like their nature, size and concentration - on the layer features and strengthening mechanism of electrodeposited Ni-based composite coating with different matrix is not cleared well. Furthermore, the incorporation of particles into the deposit is mainly considered as a key factor for determining the composite coatings properties. Despite of existing models of ECD, the mechanism of particle incorporation into the film under influence of different particle characteristics has not been well understood yet. Therefore, the main aim of this study is to shed light on the effect of particle characteristics (size, concentration, type) on the codeposition process, microstructure and strengthening mechanisms in Ni and Ni-P electrodeposited composite coatings.

[pt] Neste trabalho realizou-se uma investigação experimental sobre os efeitos de forças de impacto sobre a resistência de aderência entre compósitos de fibras de carbono e o concreto. O programa experimental consistiu de ensaios de flexão de corpos-de-prova constituídos de dois blocos de concreto unidos por uma rótula na região superior (comprimida) e por tiras de compósito de fibras de carbono coladas nas faces inferiores dos blocos. Foram ensaiados 23 corpos-deprova, com resistências à compressão do concreto variando de 25 MPa a 35 MPa. A principal variável foi a taxa de carregamento ( expressa em termos de tensão de aderência), variou entre 6,06 MPa/s (estático) a 3.690.485 MPa/s (dinâmico). Os resultados mostraram que a resistência de aderência aumenta com o aumento da taxa de carregamento. / [en] An experimental investigation on the effects of impact loads on the bond strength between carbon fiber composite and concrete is described in this work. The objective was to investigate the influence of loading rate on the bond strength. Concrete-fiber specimens were tested under loading rates varying from a minimum of 6,06 MPa/s (static) to a maximum of 3.690.485 MPa/s. In addition, twenty tree concrete prisms were tested under different loading rates in order to investigate the effects of the loading rate on the tensile strength of concrete and carbon fiber separately. The results show that the bond strength increase with the increase of the loading rates.