压铸镁合金AZ91D高周疲劳性能研究

杨友; 刘勇兵; 杨晓红

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压铸镁合金AZ91D高周疲劳性能研究
High Cycle Fatigue Properties of AZ91D Die Cast Magnesium Alloy
2006年第2期页码：105-107
纸质出版日期： 2006 ，
DOI：

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[1]杨友,刘勇兵,杨晓红.压铸镁合金AZ91D高周疲劳性能研究[J].特种铸造及有色合金,2006(02):105-107+63.

Yang You~ 1, 2, Liu Yongbing~1. High Cycle Fatigue Properties of AZ91D Die Cast Magnesium Alloy[J]. Special Casting & Nonferrous Alloys, 2006,(2):105-107.
[1]杨友,刘勇兵,杨晓红.压铸镁合金AZ91D高周疲劳性能研究[J].特种铸造及有色合金,2006(02):105-107+63. DOI：

Yang You~ 1, 2, Liu Yongbing~1. High Cycle Fatigue Properties of AZ91D Die Cast Magnesium Alloy[J]. Special Casting & Nonferrous Alloys, 2006,(2):105-107. DOI：

摘要

研究了压铸镁合金AZ91D在应力比R=0.1条件下的高周疲劳性能。结果表明:AZ91D压铸镁合金的室温条件疲劳强度在应力比R=0.1时大约相当于其抗拉强度的44%;AZ91D合金内部的一些缺陷如夹杂等

容易引起应力集中

从而导致裂纹的萌生;AZ91D合金的疲劳断口可以观察到3个典型区域:疲劳源区、疲劳裂纹扩展区和瞬断区。疲劳裂纹扩展区的疲劳裂纹不明显

疲劳断口呈现出准解理断口的形貌。

Abstract

The high cycle fatigue properties of AZ91D die cast magnesium alloy were investigated under the condition of stress ratio R=0.1.Fatigue strength of AZ91D magnesium alloy at ambient temperature is about 44% of tensile strength.Some defects in AZ91D Mg alloy

such as inclusion

can induce the formation of fatigue crack due to stress collection.Observation from AZ91D Mg alloy fracture morphology indicates that it is composed of fatigue source zone

fatigue crack propagation zone and fatigue fracture zone

where the fatigue lines is not evident and fatigue fracture morphology is quasi-cleavage fracture.