梁戈,张亚娟,林敏

• 1:西安理工大学材料学院
• 2:西安交通大学金属材料强度国家重点实验室

摘要(Abstract)：

利用旋转弯曲疲劳试验机研究了三种膜厚(10μm、15μm、20μm)的微弧氧化处理LD10铝合金的疲劳性能;采用SEM观察微弧氧化试样的表面、截面以及断口形貌;利用XRD分析微弧氧化试样的表面相组成和表面残余应力。结果表明:微弧氧化膜层由AlSi0.5O2.5非晶相组成,膜层中的微裂纹起源于放电通道(微孔),终止在通道附近区域;膜层附近基体中存在残余拉应力,促使疲劳裂纹在此形成和扩展,导致10μm、15μm、20μm三种膜厚的微弧氧化处理铝合金的疲劳寿命分别下降了63%、75%和65%,疲劳极限分别下降了9.5%、7.9%和9.9%。

关键词(KeyWords)： 微弧氧化;LD10铝合金;弯曲疲劳;残余应力

Abstract:

Keywords:

基金项目(Foundation): 西安航空制动科技有限公司项目

作者(Author): 梁戈,张亚娟,林敏

DOI: 10.13289/j.issn.1009-6264.2010.02.010

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