Effect of extrusion temperature on the microstructure and thermal conductivity of Mg-2.0Zn-1.0Mn-0.2Ce alloys

被引：52
作者：
Peng, Jian [1 ,2 ,5 ]
Zhong, Liping [1 ]
Wang, Yongjian [1 ]
Lu, Yun [3 ,4 ]
Pan, Fusheng [2 ,5 ]
机构：
[1] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China
[2] Chongqing Univ, Natl Engn Res Ctr Magnesium Alloys, Chongqing 400045, Peoples R China
[3] Chiba Univ, Grad Sch, Chiba 2638522, Japan
[4] Chiba Univ, Fac Engn, Chiba 2638522, Japan
[5] Chongqing Acad Sci & Technol, Chongqing 401123, Peoples R China
来源：
MATERIALS & DESIGN | 2015年 / 87卷
关键词：
Mg-2.0Zn-1.0Mn-0.2Ce alloys; Extrusion temperature; Thermal conductivity; Microstructure; Micro-hardness; BINARY MG-AL; MECHANICAL-PROPERTIES; AS-CAST; ELECTRICAL-CONDUCTIVITY; RARE-EARTH; DIFFUSIVITY; PARAMETERS; RESISTIVITY; STRENGTH; TEXTURE;
D O I：
10.1016/j.matdes.2015.08.043
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This study investigated the effect of extrusion temperature on the microstructure and thermal conductivity of Mg-2.0Zn-1.0Mn-0.2Ce. The thermal conductivity of the alloy was measured using the flash method at room temperature. Results indicated that the volume fraction of un-recrystallized grains decreased and the average grain size of recrystallized grains gradually increased with increasing extrusion temperature. The thermal conductivity of Mg-2.0Zn-1.0Mn-0.2Ce alloys initially increased, reached the maximum value of 131 W/(m.K) when the extrusion temperature increased from 340 degrees C to 400 degrees C, and then decreased to 125 W/(m.K) when the extrusion temperature further increased to 430 degrees C. The obtained maximum thermal conductivity meets the requirement for Mg alloy radiating module of LED lights. A micro-hardness of approximately 59 HV is maintained at extrusion temperature lower than 400 degrees C, while it sharply increases up to 74.0 HV when the alloy is extruded at 430 degrees C. The extrusion temperature changes the microstructure and solid solution of elements, which comprehensively affect the thermal conductivity of as-extruded alloys. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：914 / 919
页数：6
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