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“Materials Design Based on High Entropy Alloys”

发布者:吴正刚发布时间:2018-09-11浏览量:

湖南大学天马材料研究论坛133

  目:Materials Design Based on High Entropy Alloys

报告人:吴正刚 教授(湖南大学岳麓学者材料学院金属材料及控制工程系教师)

  点: 工程实验大楼244240多媒体报告厅

  间: 2018918日(周二)下午3:45-5:00

主持人: 严红革 教授

邀请人: 材料科学与工程学院

承办人: 材料学院天马材料研究论坛日常工作小组


报告人简介:

吴正刚,19871月出生于湖北省黄冈市。2008年本科毕业于中南大学粉末冶金专业,2014年博士毕业于美国田纳西大学材料科学与工程专业,师从美国工程院院士 George M Pharr 教授。博士毕业后,分别在田纳西大学和美国能源部橡树岭国家实验室从事博士后研究。主要研究方向为传统及先进金属结构材料的设计与开发,结构材料显微组织及力学性能表征,同种/异种金属焊接性能分析与焊接过程优化。


报告摘要:

Recently, solid solution alloys reignited metallurgists’ passion through a novel alloy design paradigm which involves the mixture of more than five elements in an equi- or near-equiatomic composition. This strategy is deviated from conventional ‘base element’ concept that uses one metallic element as the base alloy. Also, such alloys do not obey the tranditional Hume-Rothery rules that increasing the number of alloying elements with varying crystal structures will simultaneously increase the probability for the formation of additional phases. Instead, single phase solid solution alloys have been synthesized in many multicomponent alloys with equiatomic or near equiatomic concentrations. One initially suggested contribution to this single-phase tendency, which is the high configurational entropy of the random mixing of elements, defined this class of alloys as ‘high entropy alloy’ (HEA). In this talk, the microstructural control, mechanical properties, deformation mechanisms and weldability analysis of a family of face-centered cubic single phase HEAs will be presented and discussed.


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