Microstructural Refinement of a Ti-40Al-8Nb-0.5B Alloy by Hot Deformation Within (α+β) Phase Field and Subsequent Tempering
Microstructural Refinement of a Ti-40Al-8Nb-0.5B Alloy by Hot Deformation Within (α+β) Phase Field and Subsequent Tempering
复制标题
通过（α+β）相场内的热变形和后续回火来细化 Ti-40Al-8Nb-0.5B 合金的微观结构
DOI：
10.1002/adem.201900239
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发表时间：
2019
影响因子：
3.6
通讯作者：
Hongchao Kou
中科院分区：
文献类型：
--
作者：
Pujian Tian;Guang Yang;Zhenghao Ge;Yifei Wang;Liang Cheng;Yanhui Liu;Hongchao Kou
本工作对Ti-40Al-8Nb-0.5B合金(at%)在(α + β)相区进行热变形，然后在800 °C回火，获得了细化的组织。结果表明，在热变形过程中，α相发生了动态再结晶，使晶粒细化到56~18 µm，同时在变形后的α相中引入了高密度的层错。在80 0 °C回火5 h后，有序的γ2相按照Blackburn取向关系析出超薄的α片层。平均片层间距约为10 nm。片层间距的细化主要归因于热变形引起的γ相的大量形核。此外，在残留的B2相中形成了细小的γ和ω0颗粒，导致了细小的近层片状组织的形成。
In this work, a refined microstructure is obtained in a Ti‐40Al‐8Nb‐0.5B alloy (at%) by hot deformation in the (α + β) phase region and subsequent tempering at 800 °C. The results show that the dynamic recrystallization of α phase occurred during the hot deformation, which resulted in the grain refinement from 56 to 18 µm. Meanwhile, high‐density stacking faults are introduced into the deformed α phase. After tempering at 800 °C for 5 h, ultra‐thin γ lamellar precipitated from the ordered α2phase by following the Blackburn orientation relationships. The average lamellar spacing is about 10 nm. The refinement of lamellar spacing is mainly attributed to the numerous nucleation sites of γ phase caused by the hot deformation. In addition, fine γ and ω0particles formed in the retained B2 phase, leading to the formation of a refined near‐lamellar microstructure.