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温道胜,王守仁,单德彬,宗影影.TiAl基合金在置氢退火过程中γ相120o<111>孪晶界形成机制研究[J].稀有金属材料与工程(英文),2019,48(9):2789~2993.[Wen Daosheng,Wang Shouren,Shan Debin and Zong Yingying.Investigation on the formation mechanism of 120o<111> twin boundaries in γ phase of a TiAl based alloy during annealing treatment in hydrogen atmosphere[J].Rare Metal Materials and Engineering,2019,48(9):2789~2993.]
Investigation on the formation mechanism of 120o<111> twin boundaries in γ phase of a TiAl based alloy during annealing treatment in hydrogen atmosphere
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Received:February 03, 2018??Revised:April 04, 2018
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Key words:?TiAl based alloy??Annealing treatment??Hydrogen??Static recrystallization??120o<111> twin boundaries
Foundation item:国家自然科学基金项目(51275132, 51705199, 51372101),山东省自然科学基金项目(ZR2017BEE055),山东省优秀中青年科学家奖励基金(ZR2016EMB01),山东省泰山学者工程专项(2016-2020)
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Wen Daosheng,Wang Shouren,Shan Debin and Zong Yingying??
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Abstract:
??????The effect of hydrogen on 120o<111> twin boundaries in γ phase of an as-cast and as-forged Ti–46Al–2V–1Cr–0.3Ni alloy was investigated by means of annealing treatment in hydrogen atmosphere, and the microstructure was observed by an optical microscopy, a scanning electron microscopy, an electron back scattered diffraction technique, a transmission electron microscopy and a X-ray diffraction apparatus. The results showed that hydrogen could promote γ-phase static recrystallization of the as-cast and as-forged alloy, and the extent of static recrystallization increased with increasing hydrogen content. Many static recrystallization grains possessed 120o<111> twin boundaries. The relationship between the fraction of 120o<111> twin boundaries and hydrogen content was given. Hydrogen-weakened γ-phase elastic anisotropy increased 120o<111> twin boundaries.