Magnesium sheet for automotive applications is very attractive due to its light weight. The poor formability of magnesium and its alloys at room temperature, however, has limited the applications of these alloys. For this reason, at present, magnesium must be formed at elevated temperatures. This study investigates the hot deformation and fracture characteristics of Mg-1wt% Zn alloys containing a range of Al and Mn levels. Hot-rolled specimens were tensile tested over a range of strain rates and temperatures. Strain rate versus flow stress diagrams plotted on log-log scales revealed a transition in deformation mechanisms as a change in slope (the 'stress exponent'). Specifically, non-uniform deformation (i.e. necking) is observed at high strain rates, while uniform deformation is observed at low rates. This transition is accompanied by a change in fracture mechanism from dimpled rupture at high strain rates to cavitation and cavity interlinkage at low strain rates. Specimens which had a stress exponent of ∼2 and which failed through uniform deformation showing interlinked cavities have been associated with the grain boundary sliding (GBS) deformation mechanism. Specimens which had a stress exponent of ~5 and which failed through necking showing a dimpled fracture surface have been associated with the dislocation creep deformation mechanism. Increasing aluminum appears to somewhat favour the GBS regime as indicated by a slightly decreasing stress exponent. Manganese also appears to favor the GBS regime, since the onset of cavitation appears at higher strain rates compared to alloys without Mn.

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This thesis describes the origins of the Scottish architectural iron founding industry. It also investigates the underpinning reasons for the proliferation of the Scottish industry in terms of the technological context and the complex inter–relationships of the key figures and firms involved. The founding of Carron in 1759, combined with the discovery of blackband ironstone and the means to smelt it, prompted the rapid growth of the iron founding industry at the start of the 19th century. The influence of Carron in propagating a broader industry and the evolution of the early architectural specialists are discussed. Accounts are given of the key Scottish firms and projects and structures are considered in detail. The Saracen Foundry of Walter Macfarlane and Co is identified as a firm of international importance. The comparative outputs of the key firms in relation to known structures are considered as well as the decline of the industry towards the end of the 20th century. Significant works of innovation are identified which have not previously been appreciated in early iron façade construction at Perth Waterworks, and possibly the earliest iron glasshouse at Fairfield House in Dalkeith.

Thesis (Ph.D.) -- McMaster University, 1998. / Includes bibliographical references (leaves 117-126). Also available via World Wide Web.

Thesis (M.F.A.)--Rochester Institute of Technology, 1995. / Typescript. Includes bibliographical references (leaves 36-39).

Thesis (M.S.)--Rochester Institute of Technology, 1988. / Typescript. Includes bibliographical references (leaves 74-76).

Thesis (M.F.A.)--Rochester Institute of Technology, 1990. / Typescript. Includes bibliographical references (leaves 24-29).

Univ., Habil.-Schr.--Frankfurt a.M., 2000.

Thèse (M.Eng.) -- Université du Québec à Chicoutimi, 2008. / La p. de t. porte en outre: Mémoire présenté à l'Université du Québec à Chicoutimi comme exigence partielle de la maîtrise en ingénierie. CaQQUQ Bibliogr.: f. [147]-152. Document électronique également accessible en format PDF. CaQQUQ

Thesis (M.S.)--University of Wisconsin--Madison, 1970. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.