CAREER: Twinning Induced Grain Boundary Engineering In Ultrafine Grain Materials: A Multidisciplinary Approach

职业：“Twining Induced Grain Boundary Engineering In Ultrafine Grain Materials：A Multidisciplinary Approach“Ibrahim Karaman，Department of Mechanical Engineering，Texas A& M University摘要对固体界面含量和结构的控制可以被认为是材料演化中最重要的过程之一。这对于控制超细晶粒材料（UFG）（晶粒尺寸1 mm）的物理和机械性能特别重要，因为界面的体积分数很大。该职业计划旨在开发孪生诱导晶界工程（GBE）的新策略，加深对UFG材料中GBE的理解，并利用综合研究和教育方法，开发由晶界及其内部控制的材料性能的预测和控制能力。研究计划侧重于三个重点领域：1）加工：从粉末前体或块状前体开始，通过剧烈塑性变形加工，然后进行热处理，以改变边界和纹理的结构和分数，制造UFG材料，2）表征：边界特征分布、纹理、利用独特的实验技术，如取向成像显微镜和原位中子衍射，3）建模：开发了一种跨长度尺度的分层结构材料建模方法，以预测材料的力学性能和微观结构演变，UFG材料。特别强调低层错能高强度钢中形变和退火孪晶诱导界面。这项研究计划意义重大，因为尽管控制晶界特性很重要，但从未有过将GBE和大块UFG材料结合起来并研究孪生效应的研究。教育计划是&通过开发严格的金属材料课程，并通过激励和准备学生谁可以作出贡献UFG材料工程在长期的基础上，无论是工程师和研究人员。由于微观材料世界对公众，特别是年轻人来说是一个陌生的世界，尽管它有着令人着迷的发展，但我们将付出巨大的努力来弥合这一差距。将与一所地区高中合作开发一个试点教学单元，为学生提供一个实际的感觉和实际使用材料的经验。

CAREER: "Twinning Induced Grain Boundary Engineering In Ultrafine Grain Materials: A Multidisciplinary Approach"Ibrahim KaramanDepartment of Mechanical Engineering, Texas A&M UniversityAbstractThe manipulation of the interface content and structure of solids can be considered as one of the most important processes in the evolution of materials. This is particularly important for controlling the physical and mechanical properties of ultrafine grain materials (UFG) (grain size 1 mm) because of the large volume fraction of interfaces. This CAREER program aims at developing new strategies for twinning induced grain boundary engineering (GBE), furthering the understanding of GBE in UFG materials, and developing predictive and control capabilities for the materials properties that are governed by grain boundaries and their interiors, utilizing an integrated research and education methodology.The RESEARCH PLAN focuses on three thrust areas: 1) processing: fabrication of UFG materials by severe plastic deformation processing followed by thermal treatments starting either from powder precursors or bulk precursors to vary the structure and fraction of the boundaries and the texture, 2) characterization: microstructural characterization of boundary character distribution, texture, and internal stress distribution utilizing unique experimental techniques such as orientation imaging microscopy and in-situ neutron diffraction, 3) modeling: developing a hierarchically structured materials modeling approach across length scales to predict the mechanical properties and microstructural evolution of UFG materials. Specific emphasis will be given to deformation and annealing twinning induced interfaces in low stacking fault energy, high strength steels. The research plan is SIGNIFICANT because, despite the importance of controlling the grain boundary character, there has never been a study combining GBE and bulk UFG materials and investigating the effect of twinning.The EDUCATION PLAN is to strengthen the faculty of materials engineering at Texas A&M University (TAMU) by developing a rigorous curriculum on metallic materials, and by motivating and preparing students who can contribute to UFG materials engineering on a long-term basis both as engineers and researchers. Since the micro materials world is a stranger to public, particularly the younger ones, in spite of all its fascinating developments, a significant effort will be put to bridge this gap. A pilot instructional unit will be developed, in collaboration with an area high school, to offer students a physical feel and hands-on experience with materials.