α phase growth and branching in titanium alloys

α phase growth and branching in titanium alloys
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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
Banerjee, Dipankar
中科院分区:
材料科学3区
文献类型:
--
作者:
Shi, Rongpei;Choudhuri, Deep;Kashiwar, Ankush;Dasari, Sriswaroop;Wang, Yunzhi;Banerjee, Rajarshi;Banerjee, Dipankar

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采用组合方法,将 α (α) 沉淀物的形态和空间分布绘制为 Ti-Mo 二元合金中 Mo 含量的函数。对使用快速吞吐量激光工程净形状 (LENS) 工艺处理的成分分级 Ti-xMo 样品进行热处理。在 β 固溶处理后,在 750°C、650°C 和 600°C 下时效时,成分空间涵盖 1.5 at% 至 6 at% Mo。观察到三种不同的 α 形态和分布。这些是源自晶界 α 同种异体、晶内 α 板条束和均匀分布的单个细尺度 α 板条的集落主导的微观结构。在所有这些域中都观察到 α 沉淀物的分支,其方式让人想起固态枝晶生长。这种现象在 α 体积分数较低时尤其明显。类似的特征存在于多种合金成分中。已经分析了这种分支结构的3维特征。通过结合 α/β 界面能量和弹性各向异性的相场方法模拟分支过程表明,分支过程可以在 α 板条宽面处存在的生长凸缘处开始,由这些步骤中扩散通量的增强驱动。支化对各种参数(例如过饱和度和扩散率)以及微观结构特征(例如凸缘高度和分布以及相邻 α 变体的存在)的依赖性已经进行了评估。
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.
DOI: --
发表时间: 2004
期刊:
影响因子: --
作者:
A. N. Khan;I. Salam;A. Tauqir
通讯作者: A. Tauqir
DOI: --
发表时间: 2016
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DOI: 10.1007/s11661-999-0089-6
发表时间: 1999-06-01
影响因子: 2.8
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Husain, SW;Ahmed, MS;Qamar, I
通讯作者: Qamar, I
DOI: 10.1016/j.actamat.2018.03.003
发表时间: 2018-05
期刊: Acta Materialia
影响因子: 9.4
作者:
Yufeng Zheng;Robert E. A. Williams;G. Viswanathan;W. Clark;H. Fraser
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
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影响因子: --
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