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| Effects of Process Conditions on the Microstructure of Mg--3Sn--Mn Alloy During Continuous Rheo--forming Process |
| ZHAO Zhanyong, GUAN Renguo, CAO Furong, CUI Tong, HUANG Hongqian |
| School of Materials and Metallurgy, Northeastern University, Shenyang 110004 |
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Cite this article:
ZHAO Zhanyong GUAN Renguo CAO Furong CUI Tong HUANG Hongqian. Effects of Process Conditions on the Microstructure of Mg--3Sn--Mn Alloy During Continuous Rheo--forming Process. Chin J Mater Res, 2010, 24(5): 513-454.
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Abstract Mg–3Sn–Mn alloy profiles have been successfully manufactured by the continuous rheo–forming equipment self–designed, and the effects of process conditions on the microstructures of the products were investigated. The results show that when the roll is at a certain speed and the casting temperature varies from 690oC to 750oC with the decrease of casting temperature, the composition supercooling in front of solid–liquid interface and the solid fraction in the center increase, so, the width of columnar grain zone near the edge of the product increases, the equiaxed grain zone in the central position decreases, and the average diameter of grains in the equiaxed grain zone decreases. When casting temperature is kept constant and roll speed varies from 0.052 m·s−1 to 0.087 m·s−1, with the decrease of roll speed, the solid–liquid interface tends to be stable and the melt is subjected to the shear in the roller–shoe cavity for a long time, so, the width of columnar grain zone near the edge of the product decreases and the width of equiaxed grain zone in the central position increases. When the casting temperature is 690oC and roll speed is 0.052 m·s−1, magnesium alloy profiles with cross–section of 5 mm×50 mm have been obtained, the surface and microstructure of the products are excellent, and the average grain size of
the product is 27 μm.
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Received: 21 June 2010
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| Fund: Supported by National Natural Science Foundation of China Nos.50974038 and 51034002, the Basic Scientific Research Operation of Center University No.N090502003, National High Technology Research and Development Program of China No.2007AA03Z111, and the Program for New Century Excellent Talents in University No.NCET080097. |
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