Negative Stacking Fault Energy in Metastable Face-centered Cubic Alloys

主講人 : Song Lu 研究員

Stacking fault energy (SFE) plays an important role in deformation mechanisms and mechanical properties of face-centered cubic (fcc)  ls and alloys. Since early 60s, experimental methods for determining the SFE have been developed.  Nowadays, ab initio methods  d on the density functional theory (DFT) calculations and Calphad method are used for SFE calculations too. Interestingly, deviations between the results obtained by the different methods are frequently observed in some alloy systems like steels and high-entropy alloys. I will discuss the details about the methods and explore the possible reasons. I will also discuss the correlation between the negative SFE and the deformation mechanisms (twinning and martensitic transformation) and show cases that we design novel transformation-induced plasticity (TRIP) and twinning-induced plasticity (TWIP) alloys using the calculated SFEs.

主講人簡介：

Song Lu，芬蘭國家技術研究中心首席科學家、瑞典皇家理工學院研究員、博士生導師。先后獲中科院金屬所碩士學位，瑞典皇家理工學院博士學位。曾任Thermo-Calc公司研究員、瑞典皇家理工學院、芬蘭圖爾庫大學研究員。主要研究領域為第一性原理計算，材料缺陷與力學性能。已在國際學術刊物上發表了100余篇研究論文，包括Acta Mater(13篇)、PNAS、PRB（9篇）等，負責歐盟戰略規劃局、瑞典鋼鐵協會項目5項，擔任瑞典戰略基金評審委員會委員。