期刊
ACTA MATERIALIA
卷 82, 期 -, 页码 123-136出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2014.09.009
关键词
Mechanical alloying; Non-equilibrium solid solutions; Powder processing; Kinetic Monte Carlo; Alloy design
资金
- US Defense Threat Reduction Agency [HDTRA1-11-1-0062]
- Department of Defense through the NDSEG fellowship program
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.
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