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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    No. 5    October 2007

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Influences of melt treatment on grain sizes and morphographies of AZ91D alloy
QI Xiang-chao(齐祥超)1, TANG Jing-lin(唐靖林)1, 2, LI Shuang-shou(李双寿)1, 2, ZENG Da-ben(曾大本)1

1. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China; 2. Key Laboratory for Advanced Materials Processing Technology,Ministry of Education, Tsinghua University, Beijing 100084, China

Abstract:Influences of the three melt treatment processes (namely, refinement with carbon inoculation, electromagnetic stirring and “refinement & electromagnetic stirring” processing) on the microstructures of AZ91D alloy were explored experimentally. The results indicate that the micron carbon powders inoculation processing with 0.1% (mass fraction) addition level makes the grain size of the primary phase (α-Mg) decrease to approximate 40% that of the initial primary crystal, from about 530 μm to 200 μm around. The electromagnetic stirring processing not only decreases the grain sizes sharply, but also transfers the grain shape of α-Mg from coarse dendritic to nearly spheralitic with the shape factor from about 0.1 to approximate 0.8. And the “refinement & electromagnetic stirring” processing improves grain shape of α-Mg further and refines grain size to about 72 μm, less than 15% that of the initial primary crystal.

 

Key words: melt treatment; electromagnetic stirring; grain size; grain morphology; AZ91D alloy

ISSN 1672-7029
CN 43-1423/U

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