CAREER: Evolution of Dislocation Microstructures

9702234塞林格这是一个职业奖，以一个新的教师，它结合了计算/理论材料科学的研究计划，影响本科生和研究生的教学计划。 该奖项的教育部分包括在一个多学科团队中工作，以修改非科学专业的科学课程（特别强调小学教育专业）;参与一个项目，将先进的计算带入高中课堂;以及，开发原始的基于计算机的练习和积极的小组学习到标准的本科生和研究生课程中。 该研究部分涉及对一种以前未知的形态不稳定性的研究，通过这种形态不稳定性，韧性材料中的位错在应力梯度的影响下可以自发地形成无序结构。 三维面心立方金属晶体中位错的分子动力学模拟将被用作在理论分析中找到参数的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不均匀成核中的作用，例如，在外部施加的应力下，在弗兰克-里德源处。 %这是一个职业奖，以一个新的教师，它结合了计算/理论材料科学的研究计划与影响本科生和研究生的教学计划。 该奖项的教育部分包括在一个多学科团队中工作，以修改非科学专业的科学课程（特别强调小学教育专业）;参与一个项目，将先进的计算带入高中课堂;以及，开发原始的基于计算机的练习和积极的小组学习到标准的本科生和研究生课程。 研究部分涉及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失效过程。 ***

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. ***