Microstructural evolution of mechanically alloyed Mo-Si-B-Zr-Y powders

被引：6

作者：

Yang, Tao ^{[1
]}

Guo, Xiping ^{[1
]}

Luo, Yucheng ^{[1
]}

机构：

[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China

来源：

INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS | 2016年 / 56卷

基金：

中国国家自然科学基金;

关键词：

Mechanical alloying; Molybdenum solid solution; Microstructure; Miedema model; Nanostructured material; NANOSTRUCTURE FORMATION; THERMODYNAMIC ANALYSIS; MOLYBDENUM; ATTRITION; DUCTILITY; MODEL;

D O I：

10.1016/j.ijrmhm.2015.11.012

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Elemental powder mixtures with compositions of Mo-13.8Si, Mo-20B and Mo-12Si-10B-3Zr-0.3Y (at.%) were respectively milled in a high energy planetary ball mill at a speed of 500 rpm. Microstructural evolution of powder particles during milling processes was evaluated. The results show that B can hardly be dissolved into Mo under present milling conditions and the additions of B and Si both accelerate the refining rate of Mo crystallites. For Mo-12Si-1013-3Zr-0.3Y system, the morphology and internal structure of powder particles change significantly with milling time. After 40 h of milling, an almost strain-free super-saturated molybdenum solid solution with a grain size of about 6.5 nm forms. The grain refinement mechanism and dissolution kinetics of solute atoms are highlighted. Both thermodynamic calculation and experimental results reveal that for the present alloy composition it is more favorable to form solid solution than amorphous phase. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：35 / 43

页数：9

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