原位生成TiC对快凝Al-Fe-V-Si合金中“块状相”生成的影响

EFFECT OF IN SITU TiC PARTICLES ON THE FORMATION OF CLUMP-LIKE PHASES IN RAPIDLY SOLIDIFIED Al-Fe-V-Si ALLOYS

对含有原位生成ＴｉＣ粒子的快凝Ａｌ－Ｆｅ－Ｖ－Ｓｉ合金中的显微结构进行了电镜观察．结果表明：在Ａｌ６Ｆｅ相形成的温度范围内，ＴｉＣ粒子消除了初生Ａ１６Ｆｅ块状相，诱发了初生ａｌｍＦｅ相，ＡｌｍＦｅ相以包裹ＴｉＣ粒子的形式生长成类球状形貌，消除了边角效应，并用连续冷却方式下的形核理论对ＴｉＣ粒子的原位生成对合金中各相的形核动力学影响进行了分析与计算，与试验结果有较好的吻合．

The microstructure of rapidly solidified(RS) Al-Fe-V-Si alloys containing in situ TiC particles was observed by TEM. The formation of Al6Fe clump-like phase was avoided due to in situ TiC in the temperature range forming Al6Fe clump-like phase in the RS alloy ribbons, and an Al,Fe phase eveloping TiC particles and having a sphere-like morphology formed instead of the clump-like phase. And the kinetics of nucleation of the alloys was simulated using the competing nucleation theory under continuous undercooling. The simulation results agree with the experimental results.