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针对名义成分为Ti-46Al-3.8(V,Cr,Ni)(at%)的挤压TiAl合金,研究了热处理工艺对高温时β相含量、形貌的影响,利用高温时β相对α相晶粒的钉扎作用获得了层片团尺寸均匀、细小的全层片组织,测试了具有该组织合金的拉伸性能。结果表明,在1320～1370℃范围内,随保温温度的升高,β相含量逐渐增加,使得合金的晶粒尺寸逐渐减小。实验合金经1340℃/5min/AC热处理后可以获得层片团(尺寸平均为65μm),B2相弥散分布的全层片组织。该组织的室温及高温拉伸性能均较好。少量B2相对合金的室温塑性无不利影响,对合金的高温强度可能有一定贡献。
The effect of heat treatment process on the content and morphology of β phase at high temperature was studied for the extruded TiAl alloy with Ti-46Al-3.8 (V, Cr, Ni) (at% The pinning effect of the particles obtained a uniform and fine ply of whole ply tissue, and tested the tensile properties of the alloy with the microstructure. The results show that the β phase content gradually increases with the increase of the holding temperature in the range of 1320 ~ 1370 ℃, and the grain size of the alloy decreases gradually. After 1340 ℃ / 5min / AC heat treatment, the experimental alloy can be obtained as a full-thickness lamellar structure with delaminated distribution (average size of 65μm) and B2 phase. Tissue at room temperature and high temperature tensile properties are better. A small amount of B2 relative to the room temperature plastic does not adversely affect the high temperature strength of the alloy may have contributed.