報(bào)告題目：Search BCC Refractory Multicomponent alloys with enhanced strength-ductility synergies
報(bào)告時(shí)間：6月9日上午9:00
報(bào)告地點(diǎn)：線上騰訊會議:342841476; 會議密碼：093872
報(bào)告人：齊亮 副教授
主持人：楊洋 教授
報(bào)告人簡介：
2003年于清華大學(xué)材料學(xué)院獲學(xué)士學(xué)位;
2007年于美國俄亥俄州立大學(xué)(OSU,U.S.A)獲碩士學(xué)位;
2009年于美國賓夕法尼亞大學(xué)(UPenn,U.S.A)獲材料科學(xué)與工程博士學(xué)位;
2009年至2012年期間,分別在美國賓夕法尼亞大學(xué)(UPenn,U.S.A)和麻省理工學(xué)院(MIT,U.S.A)從事博士后研究工作；
2012年至2015年期間,在加州大學(xué)伯克利分校(UC Berkeley,U.S.A)擔(dān)任科研項(xiàng)目助理；
2015年-2020年，在美國密歇根大學(xué)安娜堡分校材料工程系擔(dān)任助理教授；
2021年開始，在美國密歇根大學(xué)安娜堡分校材料工程系擔(dān)任副教授。
他的主要研究方向是利用理論和模擬計(jì)算的方法來研究材料的力學(xué)和化學(xué)性質(zhì)，包括第一性原理計(jì)算、原子模擬、多尺度建模和機(jī)器學(xué)習(xí)等。曾在2019年獲得NSF（U.S.A）職業(yè)獎(jiǎng)與2021年獲得了TMS材料加工與制造部（MPMD，U.S.A）青年領(lǐng)袖職業(yè)發(fā)展獎(jiǎng)。
報(bào)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.