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(jiǎn)介：

Song Lu，芬蘭國(guó)家技術(shù)研究中心首席科學(xué)家、瑞典皇家理工學(xué)院研究員、博士生導(dǎo)師。先后獲中科院金屬所碩士學(xué)位，瑞典皇家理工學(xué)院博士學(xué)位。曾任Thermo-Calc公司研究員、瑞典皇家理工學(xué)院、芬蘭圖爾庫(kù)大學(xué)研究員。主要研究領(lǐng)域?yàn)榈谝恍栽碛?jì)算，材料缺陷與力學(xué)性能。已在國(guó)際學(xué)術(shù)刊物上發(fā)表了100余篇研究論文，包括Acta Mater(13篇)、PNAS、PRB（9篇）等，負(fù)責(zé)歐盟戰(zhàn)略規(guī)劃局、瑞典鋼鐵協(xié)會(huì)項(xiàng)目5項(xiàng)，擔(dān)任瑞典戰(zhàn)略基金評(píng)審委員會(huì)委員。