王秋林,朱金波,李昂,门正兴,赵龙志

• 1:成都航空职业技术学院
• 2:中航成飞民用飞机有限责任公司
• 3:华东交通大学材料科学与工程学院

摘要(Abstract)：

采用激光熔注技术在7075铝合金表面制备了Al-Cr/7075Al梯度复合涂层。采用扫描电镜(SEM)、能谱仪(EDS)和X-射线衍射(XRD)和显微硬度计等研究了复合涂层的微观结构、物相及显微硬度。结果表明:Al-Cr/7075Al梯度复合涂层与基板结合良好,无裂纹、孔隙等明显缺陷;复合涂层的表面硬度为324.2 HV0.2,是7075铝合金基体的2.28倍,涂层的硬度分布沿熔池深度方向逐渐递减,呈梯度分布;复合涂层中的增强体是由Al_(0.983)Cr_(0.017)、Al_(86)Cr_(14)、AlCr_2、和Cr等混合组成,受熔池温度、熔液黏度等影响,增强体含量沿熔池深度方向逐渐减少,也呈梯度分布;Al、Cr之间的反应机理为液-固反应、固-固反应2种;复合涂层的强化机制主要是增强体承载、界面传载和位错强化。

关键词(KeyWords)： 激光熔注;梯度复合涂层;微观结构;反应机理;显微硬度

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51761012);; 四川省教育厅资助项目(18ZB0058);; 成都航空职业技术学院重点科研项目(061623Y,061902)

作者(Author): 王秋林,朱金波,李昂,门正兴,赵龙志

DOI: 10.13289/j.issn.1009-6264.2019-0413

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