快速凝固TiAl基合金微晶的显微组织

MICROSTRUCTURE OF RAPIDLY SOLIDIFIED TiAI ALLOY POWDER

用气体雾化方法制备了Ti-34Al-2Mn合金的微晶粉末,粉末典型粒度为27μm。X射线衍射结果表明,快冷态的粉末主要由α_2相和少量γ相组成。金相组织显示出等轴块状晶粒和树枝状结晶两种形态。经900℃,2h真空退火后,大部分α_2相转变成γ相,使原来的组织更加细化。

The rapidly solidified powder of Ti-34Al-2Mn alloy was produced by gas atomization. The typical value of the size of RS powder is 27μm. X-ray diffraction results show that the microstructure of RS powder consists of major α_2-phase and minor γ-phase. On the optical micrograph there are equiaxed and dendritic grains. After annealing at 900℃, 2 h in vacuum, most of α_2-phase transformed into γ-phase and the microstructure becomes finer.