Dynamic restoration and deformation heterogeneity during hot deformation of a duplex-structure TC21 titanium alloy
Dynamic restoration and deformation heterogeneity during hot deformation of a duplex-structure TC21 titanium alloy
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双相组织TC21钛合金热变形过程中的动态恢复和变形不均匀性
DOI：
10.1016/j.msea.2017.11.127
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发表时间：
2018-01
期刊：
影响因子：
6.4
通讯作者：
Liu Qing
中科院分区：
文献类型：
--
作者：
Wang Ke;Wu Mingyu;Yan Zhibing;Li Dongrong;Xin Renlong;Liu Qing
双相结构α/β钛合金中等轴α相、片状α相和β相的共存不仅有利于强度和塑性的平衡，而且在热变形过程中引起复杂的组织演化。本文的研究目的首先是研究双相结构TC21钛合金热变形过程中α相和β相的动态恢复机制，包括动态回复（DRC）和动态再结晶（DRX）。结果表明，变形后，片状α、β相的几何形貌变化较等轴α相更为明显。通过对取向差角分布和频率的分析，发现等轴α相、片状α相和β相均发生DRC和连续DRX(CDRX)，且变形温度的升高抑制了CDRX的发生。综合而言，几何形态学和动态恢复之间的相关性已经确立。同时，DRX的不均匀程度表明等轴晶和层状α之间以及β相不同局部区域之间存在形态依赖的变形不均匀性，这与等轴晶和层状α的分布密切相关。进一步的讨论表明，形态依赖的变形不均匀性从根本上归因于β相和等轴/层状α之间不同的取向关系（OR）。这一新发现丰富了人们对过去几十年钛合金变形不均匀性的认识，钛合金变形不均匀性主要归因于晶体取向的差异。
The coexistence of equiaxed α, lamellar α and β phase in a duplex-structure α/β titanium alloy not only benefits the balance between strength and ductility, but also arouses a complicated microstructure evolution during hot deformation. The research objective herein is first to investigate the dynamic restoration mechanism, including dynamic recovery (DRC) and dynamic recrystallization (DRX), of both α and β phases during hot deformation of a duplex-structure TC21 titanium alloy. The results show that, after deformation, the geometric morphologies of lamellar α and β phase change more apparently than equiaxed α. Based on the analysis on the distribution and frequency of misorientation angle, it reveals that DRC and continuous DRX (CDRX) occur in all of equiaxed α, lamellar α and β phase, and the increasing deformation temperature restrains the occurrence of CDRX. Synthetically, the correlation between geometric morphology and dynamic restoration is well established. Meanwhile, the heterogeneous degree of DRX indicates a morphology dependent deformation heterogeneity between equiaxed and lamellar α, and between different local regions in β phase which is closely related to the distribution of equiaxed and lamellar α. The further discussion reveals that the morphology dependent deformation heterogeneity is fundamentally attributed to the different orientation relationship (OR) between β phase and equiaxed/lamellar α. This new find enriches the understanding on the deformation heterogeneity of titanium alloy, which was mainly attributed to the difference in crystallographic orientations in past decades.
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影响因子：
9.4
作者：
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