Influence of extrusion temperature on microstructure and mechanical properties of Mg-4Y-4Sm-0.5Zr alloy

The solution-treated Mg-4Y-4Sm-0.5Zr alloy was extruded at temperatures from 325 ℃ to 500 ℃. Dynamic recrystallization （DRX） completely occurs when the alloy is extruded at 350℃ and above. The grains of the extruded alloy are obviously refined by the occurrence of DRX. The average grain size of the...

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Published in:Transactions of Nonferrous Metals Society of China 2010-07, Vol.20 (7), p.1311-1315
Main Author: 李大全 王渠东 丁文江 J. J. BLANDIN M. SUERY
Format: Article
Language:English
Subjects:
ageing
Chemical Sciences
China
Dynamic recrystallization
Elongation
Extrusion
Grain size
heat treatment
Magnesium base alloys
Material chemistry
mechanical properties
Mg-Y-Sm-Zr alloy
Precipitation
Yield strength
力学性能
动态再结晶
平均晶粒尺寸
挤压温度
晶粒细化
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description The solution-treated Mg-4Y-4Sm-0.5Zr alloy was extruded at temperatures from 325 ℃ to 500 ℃. Dynamic recrystallization （DRX） completely occurs when the alloy is extruded at 350℃ and above. The grains of the extruded alloy are obviously refined by the occurrence of DRX. The average grain size of the extruded alloy increases with increasing the extrusion temperature, leading to a slight decrease of the ultimate tensile strength （UTS） and the yield strength （YS）. On the contrary, the UTS and YS of the extruded and aged alloy increase with increasing the extrusion temperature. Values of UTS of 400 MPa, YS larger than 300 MPa and elongation （EL） of 7% are achieved after extrusion at 400 ℃ and ageing at 200℃ for 16 h. Both grain refinement and precipitation are efficient strengthening mechanisms for the Mg-4Y-4Sm-0.5Zr alloy.
doi_str_mv 10.1016/S1003-6326(09)60296-X
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subjects ageing
Chemical Sciences
China
Dynamic recrystallization
Elongation
Extrusion
Grain size
heat treatment
Magnesium base alloys
Material chemistry
mechanical properties
Mg-Y-Sm-Zr alloy
Precipitation
Yield strength
力学性能
动态再结晶
平均晶粒尺寸
挤压温度
晶粒细化
title Influence of extrusion temperature on microstructure and mechanical properties of Mg-4Y-4Sm-0.5Zr alloy
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