α phase growth and branching in titanium alloys
α phase growth and branching in titanium alloys
复制标题
钛合金中α相的生长和分枝
DOI:
10.1080/14786435.2021.1998693
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发表时间:
2022
影响因子:
1.6
通讯作者:
Banerjee, Dipankar
中科院分区:
文献类型:
--
作者:
Shi, Rongpei;Choudhuri, Deep;Kashiwar, Ankush;Dasari, Sriswaroop;Wang, Yunzhi;Banerjee, Rajarshi;Banerjee, Dipankar
The morphology and spatial distribution of alpha (α) precipitates have been mapped as a function of Mo content in Ti-Mo binary alloys employing a combinatorial approach. Heat-treatments were carried out on compositionally graded Ti-xMo samples processed using a rapid throughput laser engineered net shape (LENS) process. The composition space spans 1.5 at% to 6 at% Mo with ageing at 750°C, 650°C and 600°C following a β solution treatment. Three distinct regimes of α morphology and distribution were observed. These are colony-dominated microstructures originating from grain boundary α allotriomorphs, bundles of intragranular α laths, and homogeneously distributed individual fine-scale α laths. Branching of the α precipitates was observed in all these domains in a manner reminiscent of solid-state dendritic growth. The phenomenon is particularly apparent at low volume fractions of α. Similar features are present in a wide variety of alloy compositions. 3-dimensional features of such branched structures have been analysed. Simulation of the branching process by phase field methods incorporating anisotropy in the α/β interface energy and elasticity suggests that it can be initiated at growth ledges present at broad faces of the α laths, driven by the enhancement of the diffusion flux at these steps. The dependence of branching on various parameters such as supersaturation and diffusivity, and microstructural features like ledge height and distribution and the presence of adjacent α variants has been evaluated.
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DOI:
--
发表时间:
2004
期刊:
影响因子:
--
作者:
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通讯作者:
A. Tauqir
DOI:
--
发表时间:
2016
期刊:
影响因子:
--
作者:
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通讯作者:
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DOI:
10.1007/s11661-999-0089-6
发表时间:
1999-06-01
影响因子:
2.8
作者:
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通讯作者:
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影响因子:
9.4
作者:
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通讯作者:
Yufeng Zheng;Robert E. A. Williams;G. Viswanathan;W. Clark;H. Fraser
DOI:
10.1016/0001-6160(87)90179-9
发表时间:
1987-03
期刊:
Acta Metallurgica
影响因子:
--
作者:
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通讯作者:
E. Menon;H. Aaronson