方锳泽,周小平,徐峰

• 1:湖北工业大学机械工程学院绿色轻工材料湖北省重点实验室

摘要(Abstract)：

磨擦加工技术(FSP)细化铝合金表面涂层组织及增强结合强度的机制采用无针搅拌头对7075铝合金表面热喷涂铝基Al_2O_3-TiB_2涂层进行搅拌摩擦加工。通过SEM分析了搅拌摩擦加工前后涂层的组织,粘结拉伸法测试了涂层搅拌摩擦加工前后的结合强度。应用ABAQUS有限元软件模拟分析搅拌摩擦加工过程中的温度场和应力场。结果表明,搅拌摩擦加工过程,涂层加工区域的温度达到500℃以上,应力超过330 MPa,涂层发生了剧烈的热机械变形,产生动态再结晶,使原始组织中孔洞、间隙和裂纹等缺陷消失,形成细小的新晶粒。涂层和基体间由于剧烈的热机械变形产生固相焊合,结合强度由5.2 MPa提高到48.6 MPa。

关键词(KeyWords)： 搅拌摩擦加工;热机械变形;热喷涂涂层;结合强度;铝合金

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51171062)

作者(Author): 方锳泽,周小平,徐峰

DOI: 10.13289/j.issn.1009-6264.2016.07.026

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