采用横流CO2激光,在Ni基高温合金表面制备了纳米Al2O3弥散强化(ODS)Ni基合金熔覆层.利用光学显微镜、扫描电镜及EDS附件分析了熔覆层的组织结构.结果表明:界面晶粒的生长方向为垂直于界面的"外延式"生长;加入纳米Al2O3,界面的生长形态发生变化,由细长的柱状树枝晶转变为较短的树枝晶;纳米Al2O3含量增大至1%时整个断面获得等轴枝晶组织;纳米Al2O3作为异质形核的核心,细化了组织.
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