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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Effect of spray forming on evolution of microstructure and
mechanical behavior of Mg-9Al-1Zn alloy
YU Hong-yan(余红燕)1, HUANG Jin-feng(黄进峰)1, LI Yong-bing(李永兵)1,
 CUI Hua(崔  华)2, HE Jian-ping(何建平)1, ZHANG Ji-shan(张

1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing,
Beijing 100083, China;
2. School of Materials Science and Engineering, University of Science and Technology Beijing,
Beijing 100083, China

Abstract:The cylindrical billet of Mg-9Al-1Zn alloy was produced by spray forming and hot extruded at 698−723 K with an extrusion ratio of 22׃1. The microstructural evolution was investigated systematically. The mechanisms of grain refinement, solubility extension of Al and Zn elements in Mg matrix, and the precipitation of the second phase β-Mg17Al12 as well as their effect on the mechanical properties of the Mg-9Al-1Zn alloy were analyzed and discussed. The results show that the spray formed Mg-9Al-1Zn alloy has homogeneous equiaxed fine grains with the average grain size of 17 μm, of which the average grain size is refined further to 5 μm due to dynamic recrystallization during hot extrusion process. The evolution of size, proportion and distribution of β-Mg17Al12 phase was also observed and analyzed. The mechanical properties for the extruded rods are improved remarkably at ambient temperature.

 

Key words: Mg-9Al-1Zn alloy; magnesium alloy; spray forming; microstructure; mechanical property

ISSN 1672-7029
CN 43-1423/U

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