Phase strength effects on chemical mixing in extensively deformed alloys
Phase strength effects on chemical mixing in extensively deformed alloys
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DOI：
10.1016/j.actamat.2014.09.009
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发表时间：
2015-01-01
期刊：
影响因子：
9.4
通讯作者：
Schuh, Christopher A.
中科院分区：
文献类型：
--
作者：
Cordero, Zachary C.;Schuh, Christopher A.
在广泛的拉伸过程中，强制化学混合要求组成相共变形，因此是它们的机械性能，特别是强度的敏感函数。为了定量了解这种相强度对剧烈变形过程中共变形和稳态化学混合物的影响，我们研究了高能球磨机机械合金化过程中几种强度差异较大的钨过渡金属偶对。粉末的显微组织、力学性能和化学混合的变化揭示了两种不同的行为：根据基体合金元素的相对强度，合金要么在化学上均匀化，要么保持双相。力学合金化的动力学蒙特卡罗模拟解释了相强度失配再现了实验观察到的行为，并提供了定量的洞察材料和控制机械混合的工艺参数的组合。
Forced chemical mixing during extensive straining requires that the constituent phases co-deform, and is therefore a sensitive function of their mechanical properties, particularly strength. To develop a quantitative understanding of such phase strength effects on co-deformation and steady-state chemical mixity during severe deformation processing, we studied several tungsten transition metal couples with a range of differences in strength during a process of mechanical alloying in a high-energy ball mill. Changes in the powders' microstructures, mechanical properties and chemical mixing revealed two distinct behaviors: alloys either chemically homogenized or remained dual phase, depending on the relative strengths of the base alloying elements. A kinetic Monte Carlo simulation of mechanical alloying that accounts for a phase strength mismatch reproduced the experimentally observed behaviors, and provides quantitative insight into the combination of material and processing parameters that control mechanical mixing.