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Abstract
Simple estimates of the theoretical strength of materials can be made by reference to the strength of their chemical bonding and some idealised defect free materials approach these strength levels. However for the majority of engineering materials we need to consider strengthening and the associated increase in internal energy in terms of the accumulation of defects such as dislocations and ways in which the motion of dislocations can be inhibited.
In this talk I will consider the limits to dislocation accumulation and the role of a variety of features such as solute atoms twin interfaces and martensitic reactions in providing strengthening mechanisms.
The talk will explore both the limits of conventional strengthening mechanisms and the value of considering in homogenous and Architectured materials to provide useful combinations of strength and ductility at strength levels close to the theoretical strength.
Brief C.V.
David Embury is an Emeritus Professor at McMaster University in Canada. He continues his teaching and research career at UBC in Vancouver at INPG in France and in association with SJTU and IMR in China.
He was educated at the universities of Manchester and Cambridge in the UK where he worked on the study of precipitation hardening in Al alloys using TEM methods. After his doctoral studies he worked at US Steel Laboratories on the drawing of high strength pearlitic steels before taking up an academic position at McMaster University in Canada. During his career at McMaster he has made contributions in the areas of strengthening mechanisms , basic studies of fracture and more recently in the development of ultra-high strength steels and Architectured Materials He has received a number of awards and is a Fellow of the Royal Society of Canada and of The National Academy in the USA.
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