Deformation map of metallic glass:Normal stress effect  

金属玻璃的变形图:正应力效应

作　　者：Shaojie Wu Ruitao Qu Zhengwang Zhu Haifeng Zhang Zhefeng Zhang 吴少杰;屈瑞涛;朱正旺;张海峰;张哲峰(Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China [2]School of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026,China

出　　处：《Science China Materials》2020年第12期2620-2626,共7页中国科学（材料科学（英文版）

基　　金：supported by the National Natural Science Foundation of China(51771205);Liaoning Revitalization Talents Program(XLYC1808027)。

摘　　要：Up to now,it remains unclear how normal stress affects the deformation mode transition of metallic glasses(MGs)at high temperatures.Here by constructing the deformation maps under both compression and tension,we show that the tensile normal stress can largely promote the transition from shear localization to homogeneous deformation while the compressive one may slightly suppress it,demonstrating a significant normal stress effect.The present results emphasize the critical role of stress state in high-temperature deformation of MGs,implying that the thermoplastic forming of MGs could be better controlled via adjusting the local stress state.正应力如何影响金属玻璃高温下的变形方式转变目前仍不清楚.本文通过同时构建金属玻璃在压缩和拉伸下的变形图,发现存在显著的正应力效应,即拉伸正应力能极大地促进剪切局域化到均匀变形的转变,而压缩正应力则可能轻微抑制该转变.本研究结果强调了应力状态在金属玻璃高温变形中的关键作用,并预示着可通过调整局部应力状态来更好地控制金属玻璃的热塑性成形.

关 键 词：金属玻璃 变形图 均匀变形 变形方式 高温变形 热塑性成形 应力效应 正应力 

分 类 号：TG139.8[一般工业技术—材料科学与工程]