不同冷却速度下A1-5Fe、A1-5Fe-3Y合金组织和相组成

Microstructure and Phase Constitution of Al-5Fe and Al-5Fe-3Y Alloys at Different Cooling Speed

分别采用熔炼、吸铸和单辊甩带法制备了铸态、亚快速凝固和快速凝固下的A1-5Fe合金和A1-5Fe-3Y合金,探讨了冷却速度的提高和稀土Y的添加对A1-5Fe合金的组织和相组成的影响。结果表明,稀土Y可以使A1-5Fe合金中Al3Fe相由针状转变为团球状并使快速凝固合金中出现了二次析出相。冷却速度的提高使合金的组织得到进一步细化,并使Al-5Fe和A1-5Fe-3Y合金中分别出现了亚稳相A16Fe和金属间化合物A110Fe2Y相。

Casting,sub-rapid solidified and rapidly solidified A1-5Fe alloy and A1-5Fe-3Y alloy were respectively prepared by vacuum melting furnace,suction casting and melt spinning furnace.The influence of increasing cooling rate and adding rare earth Y on microstructure and phase composition was analyzed.The results show that the acicular Al3Fe phase transfers to spherical phase and dispersed secondary precipitations are also found when Y is added in the Al-5Fe alloy.Meanwhile,the microstructure apparently refines by increasing cooling rate,the metastable phase A16Fe and intermetallic compound A110Fe2Y phase respectively appears in Al-5Fe alloy and A1-5Fe-3Y alloy.