Effect of ball milling time on microstructures and mechanical properties ofmechanically-alloyed iron-based materials

来源期刊：中国有色金属学报(英文版)2010年第5期

论文作者：刘东华 刘咏 赵大鹏 王岩 方京华 温玉仁 刘祖铭

文章页码：831 - 838

Key words：iron-based alloy powder; mechanical alloying; microstructure; elongated particles; equiaxed grain; residual strain

Abstract: The microstructures and mechanical properties of an iron-based alloy (Fe-13Cr-3W-0.4Ti-0.25Y-0.30O) prepared by mechanical alloying were investigated with scanning electron microscope, optical microscope, X-ray diffractometer and hardness tester. The results show that the particle size does not decrease with milling time because serious welding occurs at 144 h. The density of the alloy sintered at 1 523 K is affected by the particle size of the powder. Finer particles lead to a high sintered density, while the bulk density by using particles milled for 144 h is as low as 70%. In the microstructures of the annealed alloy, large elongated particles and fine equiaxed grains can be detected. The elongated particle zone has a higher microhardness than the equiaxed grain area in the annealed alloys due to the larger residual strain and higher density of the precipitated phase.

基金信息：supported by the National Natural Science Foundation of China
supported by the Creative Research Group of National Natural Science Foundation of China