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通过激光气相合金化技术在γ TiAl铸态合金表面“原位”制得以高硬度高耐磨氮化物为增强相的金属基复合材料表面改性层。运用SEM ,XRD和TEM对改性层的微观组织转变进行了研究。结果表明 :激光气相氮化改性层内的显微组织由α ,γ ,TiN和Ti2 AlN组成 ,沿层深呈不均匀分布。改性层的显微硬度最高可达 10 0 0kg/mm2 ,约为基体硬度值的两倍。讨论了影响改性层硬度的因素
The surface modification layer of metal matrix composite with high hardness and high wear-resistant nitride as reinforcing phase was prepared by laser vapor phase alloying on the surface of γ TiAl as-cast alloy. The microstructure changes of the modified layer were studied by SEM, XRD and TEM. The results show that the microstructure in laser vapor phase nitriding modified layer is composed of α, γ, TiN and Ti2 AlN, and the distribution of the microstructure in the layer is inhomogeneous. Modified layer of microhardness up to 10 0 0kg / mm2, about double the hardness of the substrate. The factors affecting the hardness of modified layer are discussed