Ultrasonic excitation induced nanocrystallization and toughening of Zr46.75Cu46.75Al6.5 bulk metallic glass
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第10期
论文作者：W.Zhai L.H.Nie X.D.Hui Y.Xiao T.Wang B.Wei
文章页码：157 - 161
摘 要：Intensive power ultrasound is introduced to Zr46.75Cu46.75Al6.5bulk metallic glass（BMG）as an easy-procurable,non-destructive physical method to modulate its atomic rearrangement and shear deformation behavior.The microstructure after ultrasonic excitation with amplitude about 15μm in 20 k Hz for 2 h is characterized by large amount of Cu10Zr7 nanocrystals with size of 20–50 nm embedded in the glass matrix.This leads to a sharp increase in the critical stress for the first pop-in event of shear banding,and thus simultaneously improves both compressive plasticity and yield strength.Our findings provide a novel approach for overcoming the strength-ductility trade-off dilemma.
W.Zhai1，L.H.Nie1，X.D.Hui2，Y.Xiao1，T.Wang2，B.Wei1
1. School of Physical Science and Technology, Northwestern Polytechnical University2. State Key Laboratory for Advanced Metals and Materials, University of Science & Technology Beijing
摘 要：Intensive power ultrasound is introduced to Zr46.75Cu46.75Al6.5bulk metallic glass（BMG）as an easy-procurable,non-destructive physical method to modulate its atomic rearrangement and shear deformation behavior.The microstructure after ultrasonic excitation with amplitude about 15μm in 20 k Hz for 2 h is characterized by large amount of Cu10Zr7 nanocrystals with size of 20–50 nm embedded in the glass matrix.This leads to a sharp increase in the critical stress for the first pop-in event of shear banding,and thus simultaneously improves both compressive plasticity and yield strength.Our findings provide a novel approach for overcoming the strength-ductility trade-off dilemma.
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