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本研究采用非自耗电弧熔炼制备了以2.0wt%Mn为添加元素,Al/Ti比分别为32/68、33/67、34/66和35/65的四个系列TiAl基合金。探讨了不同条件的热处理和热等静压(HIP)对显微组织结构和室温延性、强度的影响,得出以下结论:(1)随Al/Ti从32/68增加至35/65,合金最终组织中块状单相晶粒含量增多,片层组织减少,Ti_3Al(α_2)相对含量减少。合金的延性、强度值在Al/Ti比为34/66时达到最高值。(2)在高温下,压力对相平衡有显著的影响。当压力为1500atm时,对于合金Ti-34Al-2Mn(wt%),其α/(α+γ)转变温度可降至1150～1200℃之间。(3)具有(γ+α_2)片层结构晶粒和γ单相晶粒组成的双态组织的合金有较高的延性。
In this study, four series of TiAl-based alloys with 2.0wt% Mn as additive elements and Al / Ti ratios of 32/68, 33/67, 34/66 and 35/65 were prepared by non-consumable arc melting. The effects of heat treatment and hot isostatic pressing (HIP) on the microstructure and room temperature ductility and strength were investigated. The following conclusions were drawn: (1) With the increase of Al / Ti from 32/68 to 35/65, In the final microstructure, the content of bulk single phase grain increased, the lamellar structure decreased and the relative content of Ti 3 Al (α 2) decreased. The ductility and strength of the alloy reached the highest values when the Al / Ti ratio was 34/66. (2) At high temperatures, pressure has a significant effect on phase equilibrium. When the pressure is 1500atm, the α / (α + γ) transition temperature of the alloy Ti-34Al-2Mn (wt%) can be reduced to 1150 ~ 1200 ℃. (3) The alloy with dual-phase structure composed of (γ + α_2) lamellar structure grains and γ single-phase grains has higher ductility.