热处理对TiAl基铸造合金组织形态的影响

The Effect of Heat Treatment on Microstructure of a Cast TiAl Alloy

研究了不同热处理制度对 Ti- 4 7Al- 2 Nb- 2 Cr- 0 .2 Si(原子分数 ,%)铸造合金组织形态的影响。研究表明 Ti- 4 7Al-2 Nb- 2 Cr- 0 .2 Si铸造合金快速冷却的铸造组织是单相γ的层片状组织 ;通过热处理可以有效控制合金的相组成 ,并且可以细化组织。经适当热处理 ,合金的晶粒尺寸可以达到 4 0～ 5 0

The effect of heat treatments on microstructure of a cast Ti 47Al 2Nb 2Cr 0 2Si(atom fraction,%) alloy was investigated The results show that the microstructure of the rapidly cooled cast alloy is single γ lamellae structure The phase constitution and grain size of the cast alloy can be adjusted through various heat treatments After a suitable heat treatment, the grain size reaches 40 50μm