CAREER: Evolution of Dislocation Microstructures

9702234 Selinger这是一项CAREER奖，颁发给将计算/理论材料科学研究项目与影响本科生和研究生的教学项目相结合的新教员。该奖项的教育部分包括与一个多学科团队合作，修改非科学专业的科学课程（特别强调基础教育专业）；参加一个将先进计算机引入高中课堂的项目；并且，将原始的基于计算机的练习和积极的小组学习纳入标准的本科和研究生课程。研究部分涉及到一种以前未知的形态不稳定性的研究，通过这种不稳定性，在应力梯度的影响下，韧性材料中的位错可以自发地发展成无序结构。三维fcc金属晶体中位错的分子动力学模拟将被用作理论分析中参数定量估计的理想手段，特别是在物理上可实现的应力梯度下的最小不稳定波长的大小。还需要研究的是温度在位错环的非均匀形核中的作用，例如，在外部施加应力的弗兰克-里德源。这是一项职业生涯奖，授予将计算/理论材料科学研究项目与影响本科生和研究生的教学项目相结合的新教员。%%%该奖项的教育部分包括与一个多学科团队合作，修改非科学专业的科学课程（特别强调基础教育专业）；参加一个将先进计算机引入高中课堂的项目；并且，将原始的基于计算机的练习和积极的小组学习纳入标准的本科和研究生课程。研究部分包括对金属中影响其机械性能的缺陷的形成和结构的理论和计算研究。这些研究不仅将产生对这些重要影响的基本理解，而且将实际应用于结构金属的破坏过程。＊＊＊

9702234 Selinger This is a CAREER award to a new faculty member which combines a research program of computational/theoretical materials science with a teaching program affecting both undergraduate and graduate students. The educational component of this award includes working on a multidisciplinary team to revise the science curriculum for non-science majors (with a particular emphasis on elementary education majors); participating in a project to bring advanced computing into the high school classroom; and, developing original computer-based exercises and active group learning into the standard undergraduate and graduate curriculum. The research component invmlves the study of a previously unknown morphological instability through which dislocations in ductile materials can spontaneously develop disordered structure under the influence of a stress gradient. Molecular dynamics simulations of dislocations in three- dimensional fcc metal crystals will be used as an ideal means of finding quantitative estimates of the parameters in the theoretical analysis, particularly the magnitude of the minimum unstable wavelength under a physically realizable stress gradient. Also to be studied is the role of temperature in the inhomogeneous nucleation of dislocation loops, e.g., at a Frank-Read source, under an externally applied stress. %%% This is a CAREER award to a new faculty member which combines a research program of computational/theoretical materials science with a teaching program affecting both undergraduate and graduate students. The educational component of this award includes working on a multidisciplinary team to revise the science curriculum for non-science majors (with a particular emphasis on elementary education majors); participating in a project to bring advanced computing into the high school classroom; and, developing original computer-based exercises and active group learning into the standard undergraduate and graduate curriculum. The research component involves both theoretical and computational research on the formation and structure of defects in metals which affect their mechanical properties. These studies will not only produce a fundamental understanding of these important effects, but will also practical applications to failure processes in structural metals. ***