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1	Ultra-fine grain two-phase aluminum alloys produced by friction stir processing Hsu, Chih-jing 22 January 2007 (has links) Friction stir processing (FSP) is applied to produce particulate-reinforced aluminum matrix composites with ultrafine grained structure from elemental powder mixtures of Al-Cu, Al-Ti and Al-Si. The microstructures of the composites were characterized by the use of XRD, SEM and TEM. Microhardness, tensile and compressive tests were performed to evaluate the mechanical properties of these composites. The mechanisms of microstructure evolution in FSP and the strengthening mechanisms in these composites are discussed. In the Al-Si system, the Si particles were broken and uniformly distributed in the stir zone by the application of multiples-pass FSP. The average size of Si particles and Al grains were refined to below ~2 Friction stir processing ultrafine grained structure Intermetallic compound
2	強ひずみ加工法による銅合金の結晶粒微細化機構に関する研究 / キョウヒズミカコウホウニヨルドウゴウキンノケッショウリュウビサイカキコウニカンスルケンキュウ浅野真由, Mayu Asano 18 September 2021 (has links) FCC組織を有する純金属と合金において強ひずみ加工法の1つである側方押出し加工（ECAP）法を用いて超微細結晶材を作製し，ECAPの各段階における力学特性と微細組織を調査した．微細組織形成過程におけるセル壁の形成から結晶粒界の形成に着目し，積層欠陥エネルギーと固溶原子による固溶強化の効果の観点から，強ひずみ加工における加工硬化ステージの推移と微細組織形成の関係を議論した. / 博士(工学) / Doctor of Philosophy in Engineering / 同志社大学 / Doshisha University 強ひずみ加工積層欠陥エネルギー固溶原子超微細組織転位セル側方押出し加工加工硬化 severe plastic deformation stacking fault energy solute atom ultrafine grained structure dislocation cell equal-channel angular pressing work hardening

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