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Mechanical Properties,Damage and Fracture Mechanisms of Bulk Metallic Glass Materials

Journal of Materials Science & Technology 2007年第6期23卷 I0003-I0006,747-767页

作者： Zhefeng ZHANG Fufa WU Guo HE Eckert Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China School of Materials Science and Engineering Shanghai Jiaotong University Shanghai 200030 China IFW Dresden Institute for Complex Materials P.O. Box 270116 D-01171 Dresden Germany TU Dresden Institute for Materials Science D-01062 Dresden Germany

The deformation, damage, fracture, plasticity and melting phenomenon induced by shear fracture were investigated and summarized for Zr-, Cu-, Ti- and Mg-based bulk metallic glasses （BMGs） and their composites. The shear fracture angles of these BMG materials often display obvious differences under compression and tension, and follow either the Mohr-Coulomb criterion or the unified tensile fracture criterion. The compressive plasticity of the composites is always higher than the tensile plasticity, leading to a significant inconsistency. The enhanced plasticity of BMG composites containing ductile dendrites compared to monolithic glasses strongly depends on the details of the microstructure of the composites. A deformation and damage mechanism of pseudo-plasticity, related to local cracking, is proposed to explain the inconsistency of plastic deformation under tension and compression. Besides, significant melting on the shear fracture surfaces was observed. It is suggested that melting is a common phenomenon in these materials with high strength and high elastic energy, as it is typical for BMGs and their composites failing under shear fracture. The melting mechanism can be explained by a combined effect of a significant temperature rise in the shear bands and the instantaneous release of the large amount of elastic energy stored in the material.

关键词： Bulk metallic glasses (BMGs) criterion Plastic deformation Mechanical properties Shear fracture failure melting phenomenon

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