Fine scale alpha precipitation in Ti-19at.%v in the absence of influence from omega precipitates
Fine scale alpha precipitation in Ti-19at.%v in the absence of influence from omega precipitates
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DOI：
10.1016/j.scriptamat.2021.113766
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发表时间：
2021-04
影响因子：
6
通讯作者：
A. Sharma;V. Soni;S. Dasari;S. Mantri;Y. Zheng;H. Fraser;R. Banerjee
中科院分区：
文献类型：
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作者：
A. Sharma;V. Soni;S. Dasari;S. Mantri;Y. Zheng;H. Fraser;R. Banerjee
虽然在包括Ti-19at%V（Ti-20wt%V）在内的几种钛合金中已经充分证明了均匀分布的细尺度α沉淀的等温ω辅助机制，但本文报道了在没有ω沉淀的任何直接或间接影响的情况下可能发生类似类型的α沉淀。β固溶处理和淬火的Ti-19 at.%的快速加热将V合金加热到500 °C导致全等非热Ω沉淀物的不稳定，随后在等温保持期间以富Ti或贫V袋的形式发展组成波动，如原子探针断层扫描所揭示的。这些袋可能是由β相分离产生的，并且随后可以充当均匀分布的α成核位点。
While the isothermal omega-assisted mechanism of homogeneously distributed fine scale alpha precipitation has been well-documented in several titanium alloys, including Ti-19at%V (Ti-20wt%V), this paper reports that a similar type of alpha precipitation may occur in the absence of any direct or indirect influence of omega precipitates. Rapid heating of a beta solution-treated and quenched Ti-19at.%V alloy to 500 °C results in destabilization of the congruent athermal omega precipitates, followed by the development of compositional fluctuations in the form of Ti-rich or V-depleted pockets during isothermal holding, as revealed by atom probe tomography. These pockets possibly result from beta phase separation and may subsequently act as homogeneously distributed alpha nucleation sites.