Topic: Dislocation engineering: a new alloy design strategy 

Speaker: Prof. Mingxin Huang 

　　　　　Department of Mechanical Engineering, The University of Hong Kong 

Time: 10:30-12:00, Thursday, October 10, 2019 

Venue: Room 249, Lee Hsun Building 

Welcome to attend! 

Abstract 

Improving the strength of alloys frequently results in a reduction in ductility, which is known as the strength-ductility trade-off in metallic materials. Current alloy design strategies for improving the ductility of ultrahigh-strength alloys mainly focus on the selection of alloy composition (atomic length scale) or manipulating ultrafine and nano-grained microstructure (grain length scale). The intermediate length scale between atomic and grain scales is the dislocation length scale. A new alloy design concept based on such dislocation length scale, namely alloy desgin by dislocation engineering, is illustrated in the present work. This dislocation engineering concept has been successfully substantiated by the design and fabrication of a deformed and partitioned (D&P) steel with a yield strength of 2.2 GPa and an uniform elongation of 16%. In the D&P steel, high dislocation density can not only increase strength but also improve ductility. 

报告人简介： 

黄明欣博士是香港大学机械工程系副教授（tenured）和副系主任，主要从事金属材料强韧化、固态相变、超高强钢设计等研究工作。研究内容包含实验研究、理论建模和三维模拟，同时兼顾基础研究与应用研究。担任国家自然科学基金汽车联合基金重点项目负责人、香港研究资助局研究影响基金（重点项目）负责人、多项香港研究资助局普通研究项目负责人、香港科技署项目负责人。与美国通用汽车、法国安赛乐米塔尔集团、鞍钢、宝钢等企业紧密合作。 

发表 SCI 期刊论文 100 余篇，包括Science （1篇）、 Acta Materialia （16篇）、Scripta Materialia（15篇）、JMPS（3篇）、International Journal of Plasticity（3篇）。担任Met. Mater. International编辑、MMTA 、MST 、JMST、JOM、MRL期刊编委 。荣获2018年美国TechConnect全球创新奖、2018 香港大学杰出青年学者奖、2018香港大学优秀研究成果奖、2017年中国科技新锐人物、2017年港大工学院卓越知识交流奖、2015、2016、2018 ACTA/Scripta Materialia杂志年度最佳审稿人等。