利用5kW CO2横流激光器对铸造铝合金表面先后预置不同成分粉末进行两次激光辐照扫描,成功地制备了Ni/WC和Cr/WC表面改性梯度层,并运用XRD、EDXS和SEM方法对激光表面改性梯度层的组织结构进行观察分析.发现经第二次激光扫描过程后在激光改性梯度层中因合金元素之间的反应,产生了大量的金属间化合物,激光改性梯度层的组织除a-Al、Si和WC外,在Ni/WC激光改性梯度层中,金属间化合物主要为Al3Ni2和Ni3Al,Cr/WC激光改性梯度层的金属间化合物为Al9Cr4和Cr.Al17.另外,显微硬度测试表明,自基体至改性层表面激光改性梯度层内显微硬度呈现连续变化趋势,而单次激光表面合金化层在与基体的交界处存在硬度突变.
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