报告题目：Search BCC Refractory Multicomponent alloys with enhanced strength-ductility synergies

报告时间：6月9日上午9:00

报告地点：线上腾讯会议:342841476; 会议密码：093872

报告人：齐亮 副教授

主持人：杨洋 教授

报告人简介：

2003年于清华大学材料学院获学士学位;

2007年于美国俄亥俄州立大学(OSU,U.S.A)获硕士学位;

2009年于美国宾夕法尼亚大学(UPenn,U.S.A)获材料科学与工程博士学位;

2009年至2012年期间,分别在美国宾夕法尼亚大学(UPenn,U.S.A)和麻省理工学院(MIT,U.S.A)从事博士后研究工作；

2012年至2015年期间,在加州大学伯克利分校(UC Berkeley,U.S.A)担任科研项目助理；

2015年-2020年，在美国密歇根大学安娜堡分校材料工程系担任助理教授；

2021年开始，在美国密歇根大学安娜堡分校材料工程系担任副教授。

他的主要研究方向是利用理论和模拟计算的方法来研究材料的力学和化学性质，包括第一性原理计算、原子模拟、多尺度建模和机器学习等。曾在2019年获得NSF（U.S.A）职业奖与2021年获得了TMS材料加工与制造部（MPMD，U.S.A）青年领袖职业发展奖。

报告摘要：

Body-centered cubic (bcc) refractorymulticomponent alloys are of great interest due to their remarkable strength athigh temperatures. Optimizing the chemical compositions of these alloys toachieve a combination of high strength and room-temperature ductility remainschallenging. We first analyzed the electronic structures of defects in BCCrefractory alloys. A general linear correlation can be found between twodescriptors of local electronic structures at defects in pure metals and thesolute-defect interaction energies in binary alloys of refractory metals withtransition-metal substitutional solutes. This linear correlation plus aresidual-corrected regression model provides quantitative and efficientpredictions on the solute-defect interactions in alloys. In addition, withthese local/global electronic descriptors and a simple bond-counting model, wedeveloped regression models to accurately and efficiently predict the unstablestacking fault energy (γusf) and surface energy (γsurf)for refractory multicomponent alloys. Using the regression models, we performeda systematic screening of γusf, γsurf, and their ratio inthe high-order multicomponent systems to search for alloy candidates that mayhave enhanced strength-ductile synergies. First-principles calculations andreported experimental results also confirmed search results.

Referencesfor the first talk:

1.Hu, YJ., Zhao, G., Zhang, B. et al. Localelectronic descriptors for solute-defect interactions in bcc refractory metals,Nature Communications, 10 (2019) 4484

2.Yong-Jie Hu, Aditya Sundar,Shigenobu Ogata, Liang Qi, Screening of generalized stacking fault energies,surface energies and intrinsic ductile potency of refractory multicomponentalloys, Acta Materialia, 210 (2021) 116800.