冲击载荷下AZ31镁合金的断裂行为

刘筱; 朱必武; 刘文辉; 唐昌平; 彭文俊

doi:10.15980/j.tzzz.2017.02.004

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冲击载荷下AZ31镁合金的断裂行为
Fracture Behavior of AZ31 Magnesium Alloy under Impacting Loading
2017年37卷第2期页码：128-130
纸质出版日期： 2017 ，
DOI： 10.15980/j.tzzz.2017.02.004

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[1]刘筱,朱必武,刘文辉,唐昌平,彭文俊.冲击载荷下AZ31镁合金的断裂行为[J].特种铸造及有色合金,2017,37(02):128-130.

Liu Xiao, Zhu Biwu, Liu Wenhui, et al. Fracture Behavior of AZ31 Magnesium Alloy under Impacting Loading[J]. Special Casting & Nonferrous Alloys, 2017,37(2):128-130.
[1]刘筱,朱必武,刘文辉,唐昌平,彭文俊.冲击载荷下AZ31镁合金的断裂行为[J].特种铸造及有色合金,2017,37(02):128-130. DOI： 10.15980/j.tzzz.2017.02.004.

Liu Xiao, Zhu Biwu, Liu Wenhui, et al. Fracture Behavior of AZ31 Magnesium Alloy under Impacting Loading[J]. Special Casting & Nonferrous Alloys, 2017,37(2):128-130. DOI： 10.15980/j.tzzz.2017.02.004.

摘要

采用霍普金森压杆技术对AZ31镁合金进行室温下应变速率为1 000

000s-1的高速冲击

利用光学显微镜和扫描电镜对断裂试样的微观组织和断口形貌进行分析。结果表明

随着应变速率的增加

材料的断裂趋势增加

材料主要表现为沿晶断裂和穿晶断裂的混合断裂方式

断口形貌具有典型的准解理断裂特征;孪晶和晶粒边界是裂纹扩展源

孪生和裂纹在变形过程中存在竞争关系。

Abstract

The as-extruded AZ31 magnesium alloy was subjected to impact loading at room temperature with different strain rates（1 000

000s-1）using a split Hopkinson pressure bar.The microstructure and facture morphology of the alloy samples were observed by optical microscopy and scanning electrical microscopy.The results show that fracture risk is increased with strain rate increase.The main fracture modes of the alloy are characterized by intergranular fracture and transgranular rupture.The fracture morphology exhibits a typical characterization of the quasi-cleavage fracture.Twinning and grain boundaries are the nucleation position of crack

and the competitive relationship between the twinning nucleation and crack initiation can be obserevd.