应力幅对退火态Mg-3Al-2Sc合金疲劳行为的影响

在不同应力幅下对退火处理后的Mg-3Al-2Sc合金进行应力控制的疲劳实验,研究应力幅对合金的裂纹扩展行为和断裂机制的影响。结果表明：在12～75MPa应力范围内,当控制应力比为0.2,随着应力幅增加,裂纹扩展速率增加,Mg-3Al-2Sc合金的疲劳断裂寿命降低。在裂纹萌生区合金主要表现为解理断裂机制,进入裂纹稳定扩展阶段的疲劳断裂主要为准解理断裂。而在瞬断区,低应力幅时主要表现为准解理断裂,高应力幅时主要表现为微孔聚合断裂。...

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Bibliographic Details
Published in材料工程 no. 12; pp. 24 - 28
Main Author 沙桂英 韩玉 刘腾 李朝华 王杰
Format Journal Article
LanguageChinese
Published 韦恩州立大学机械工程系,密歇根州底特律48202 2012
沈阳航空航天大学材料科学与工程学院,沈阳,110136%沈阳航空航天大学材料科学与工程学院,沈阳110136
Subjects
Mg-Al-Sc合金
应力幅
断裂机制
疲劳
裂纹扩展
裂纹扩展
Mg-Al-Sc合金
应力幅
断裂机制
疲劳
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ISSN1001-4381
1001-4381

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Summary:在不同应力幅下对退火处理后的Mg-3Al-2Sc合金进行应力控制的疲劳实验,研究应力幅对合金的裂纹扩展行为和断裂机制的影响。结果表明：在12～75MPa应力范围内,当控制应力比为0.2,随着应力幅增加,裂纹扩展速率增加,Mg-3Al-2Sc合金的疲劳断裂寿命降低。在裂纹萌生区合金主要表现为解理断裂机制,进入裂纹稳定扩展阶段的疲劳断裂主要为准解理断裂。而在瞬断区,低应力幅时主要表现为准解理断裂,高应力幅时主要表现为微孔聚合断裂。
Bibliography:11-1800/TB
Mg-A1-Sc alloy; stress amplitude; fatigue ; crack propagation; fracture mechanism
The stress-controlled fatigue tests for ried out under different stress amplitudes. The crack propagation and fracture mechanism was the Mg-3AI-2Sc alloy after effect of stress amplitude anneal treatment were caron the behavior of fatigue investigated. The results showed that, in the stress range of 12-75MPa and at the stress ratio of 0.2, fatigue fracture life of the Mg-3A1-2Sc alloy decrea- ses and the fatigue crack growth rate increases with the increasing stress amplitude. The cleavage fracture is the main mechanism in the crack initiation stage of the alloy. In the crack propagation stage, the predominant fracture mode is the quasi-cleavage fracture. However, for the final fracture stage, the main fracture mode is quasi-cleavage fracture at lower stress amplitude, but the fracture mode is mainly micro-voids aggregation fracture at higher stress amplitude.
SHA Gui-ying , HAN Yu , LIU Teng , LI Zhao-hua , WANG Jie （1
ISSN:1001-4381
1001-4381