王进春,孔德军

• 1:常州大学机械工程学院
• 2:江苏省材料表面科学与技术重点实验室常州大学

摘要(Abstract)：

利用阳极氧化对7475铝合金进行表面改性处理,通过拉伸疲劳试验,用罗卡提法求出阳极氧化前后7475铝合金的疲劳极限。采用SEM、XRD等手段对阳极氧化前后7475铝合金的断口形貌和组成物相进行了分析,并对阳极氧化前后7475铝合金疲劳断裂机理进行了探讨。结果表明,阳极氧化膜主要是由γ-Al2O3和α-Al2O3组成,膜层越厚,α-Al2O3相含量越多;氧化膜降低了铝合金的疲劳性能,与原始试样相比,膜层厚度为6、8和10μm的试样疲劳极限分别下降了3.2%、3.9%和4.5%;氧化膜在基体原位生长,在界面处基体中产生的残留拉应力促进了疲劳源的萌生,使铝合金的疲劳性能有所降低。

关键词(KeyWords)： 阳极氧化;7475铝合金;疲劳性能;断口形貌

Abstract:

Keywords:

基金项目(Foundation): 江苏省科协首席专家(工程师)项目(2013-216)

作者(Author): 王进春,孔德军

DOI: 10.13289/j.issn.1009-6264.2015.11.021

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