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研究了名义成分为Ti-44Al-4Nb-2(Mo,Cr,B,Y)(原子分数%)的TiAl基铸态合金,将其在共析转变温度附近保温后淬火,分析了在共析转变温度附近,保温温度与时间对合金显微组织以及硬度的影响。研究结果表明:通过DSC试验得到合金的共析转变温度为1 179.23℃;合金在共析转变(α2+γα)温度附近进行保温时,发生层片结构消溶,γ、α和B2相晶粒长大的现象;对铸态合金在1 200℃下固溶1h后进行时效还发现,当时效时间为15min时,合金出现了析出强化,从而使合金具有较高硬度。
TiAl-based as-cast alloys with Ti-44Al-4Nb-2 (Mo, Cr, B, Y) as the nominal component were investigated and quenched near the eutectoid transformation temperature. Change the temperature near the holding temperature and time on the alloy microstructure and hardness. The results show that the eutectoid transformation temperature of the alloy is 1 179.23 ℃ by DSC test. When the alloy is incubated near the eutectoid transformation (α2 + γα) temperature, the lamellar structure dissolves, the γ, α and B2 phase crystals Grain growth phenomenon; the cast alloy at 1 200 ℃ solution after 1h aging also found that when the aging time of 15min, the alloy precipitation hardening, so that the alloy has a higher hardness.