Topic: Metastable high-entropy alloys: design, structure and properties 

Speaker: Prof. Zhiming Li（李志明） 

　　　　Materials Science and Engineering (MSE) discipline, Central South University 

Time: 10:00-11:00, Thursday, April 25, 2019 

Venue: Room 249, Lee Hsun Building 

Welcome to attend! 

Abstract： 

The concept of high-entropy alloys (HEAs) has drawn great attention as it opens a new realm of compositional opportunities for designing novel materials with exceptional mechanical, physical and chemical properties. HEAs were originally proposed to contain multiple principal elements in near-equimolar ratios to stabilize single-phase solid solutions through maximizing configurational entropy. By overturning this original concept which targets for the formation of single-phase solid solution, we recently developed a novel class of HEAs with multiple compositionally equivalent high-entropy phases and transformation-induced plasticity. In this talk, I will first introduce this type of metastable HEAs by shedding light on the corresponding design principles and highlighting their superior strength-ductility combinations compared to the corresponding single-phase HEAs. Then I will introduce the recent new findings on the fundamental mechanisms underlying the transformation behavior in the metastable HEAs. Also, recent work by our research group on microstructural design of the metastable HEAs to further enhance the mechanical properties at various temperatures will be presented. 

Short Biography of Prof. Zhiming Li：

李志明博士，中南大学特聘教授、德国马普学会钢铁研究所高熵合金研究组负责人。于2014年获上海交通大学材料科学与工程专业博士学位，博士就读期间于美国加州大学戴维斯分校联合培养。以第一或通讯作者在Nature、Advanced Materials和Acta Materialia等学术期刊发表论文40余篇；在材料学国际学术会议上应邀主讲20余场学术报告。长期担任10余种学术期刊审稿人。目前主要从事新型多主元高熵合金的设计、加工、结构和性能研究；先后提出亚稳双相高熵合金、间隙高熵合金以及双向相变合金等新思路。