高应变速率挤压下AZ31B合金的压缩断裂机制

王长义

doi:10.15980/j.tzzz.2012.09.015

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高应变速率挤压下AZ31B合金的压缩断裂机制
Compressive Fracture Mechanism of Extruded AZ31B Magnesium Alloy with High Strain Rates
2012年32卷第9期页码：799-801
纸质出版日期： 2012 ，
DOI： 10.15980/j.tzzz.2012.09.015

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[1]王长义.高应变速率挤压下AZ31B合金的压缩断裂机制[J].特种铸造及有色合金,2012,32(09):799-801.

Wang Changyi. Compressive Fracture Mechanism of Extruded AZ31B Magnesium Alloy with High Strain Rates[J]. Special Casting & Nonferrous Alloys, 2012,32(9):799-801.
[1]王长义.高应变速率挤压下AZ31B合金的压缩断裂机制[J].特种铸造及有色合金,2012,32(09):799-801. DOI： 10.15980/j.tzzz.2012.09.015.

Wang Changyi. Compressive Fracture Mechanism of Extruded AZ31B Magnesium Alloy with High Strain Rates[J]. Special Casting & Nonferrous Alloys, 2012,32(9):799-801. DOI： 10.15980/j.tzzz.2012.09.015.

摘要

采用分离式Hopkinson压杆装置测试研究了挤压态AZ31B镁合金的动态压缩断裂行为

用光学显微镜和扫描电镜观察分析了AZ31B镁合金的动态压缩断口形貌。结果表明

AZ31B镁合金沿挤压方向压缩时

断口形貌呈韧-脆混合的断裂特征

裂纹经多级萌生和扩展

最终导致断裂

宏观断裂面与压缩方向成45°角

为典型的剪切破坏。

Abstract

Dynamic compressive fracture behavior of extruded AZ31B magnesium alloy was tested using the Split Hopkinson Pressure Bar apparatus.Dynamic compressive fracture morphology of AZ31B magnesium alloy was observed by optical microscope（OM） and SEM（scanning electron microscope）.The results show that the fracture morphology of AZ31B magnesium alloy is characterized by toughness-brittleness mixed model when the alloy is compressed along extruded direction.Through multi-level initiation and propagation

cracks are evolved into fracture in the end.Macro-fracture surface is located at extruding direction with the angle of 45°

exhibiting typical shearing failure.