Phase Transformation Kinetics of High Nb-TiAl Alloy during Continuous Heating

Phase Transformation Kinetics of High Nb-TiAl Alloy during Continuous Heating
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高铌钛铝合金连续加热过程中的相变动力学

DOI:
10.1088/1742-6596/2133/1/012029
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发表时间:
2021-11
期刊:
Journal of Physics: Conference Series
影响因子:
--
通讯作者:
Jianxiu Liu
Jianxiu Liu
中科院分区:
其他
文献类型:
--
作者:
Ying Li;Lian Zhou;Junpin Lin;Hui Chang;Jianglei Fan;Yang Cao;Yan Wang;Yongbiao Wang;Jianxiu Liu

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抽象。本文利用透射电镜和光学显微镜研究了Ti-45 Al-8.5 Nb-(W,B,Y)合金在连续加热过程中的相变行为。结果表明,高Nb-TiAl合金在连续加热过程中的相变过程包括有序α2 →无序α和四角γ →六角α两个阶段。显微组织分析表明,在加热过程中,原始α2/γ层状组织转变为块状γ相和α相(以α2形式保留)。α2 → α和γ → α反应的活化能分别为989.65kJ/mol和995.30kJ/mol。此外,升温速率越低,相变达到平衡状态的速度越快。
Abstract. In this work, the phase transformation behavior of Ti-45Al-8.5Nb-(W, B, Y) alloy during continuous heating was investigated using dilatometer and optical microscopy. Results indicated that the phase transformation process of high Nb-TiAl alloy during continuous heating included two stages: ordered α2 → disorder α and tetragonal γ → hexagonal α. According to the microstructure analysis, the initial α2/γ lamellar structure transformed into the massive γ phase and α phase (retained as α2) during the heating process. The activation energy of α2 → α and γ → α was 989.65 kJ/mol and 995.30 kJ/mol, respectively. Moreover, the lower the heating rate was, the faster the phase transformation reached the equilibrium state.
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