Effects of Heat Treatment on Microstructure and Mechanical Properties of Extruded Mg-5.5Zn-1.7Nf-0.7Cd-0.5Zr Magnesium Alloy

Liu Xianlan1; Liu Chuming1; Zhang Yuwen2; Li Huizhong1; Zeng Sumin1

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Effects of Heat Treatment on Microstructure and Mechanical Properties of Extruded Mg-5.5Zn-1.7Nf-0.7Cd-0.5Zr Magnesium Alloy
Vol. 30, Issue 12, Pages: 1099-1101(2010)
Published： 2010 ，
DOI：

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[1]刘先兰,刘楚明,张文玉,李慧中,曾苏民.热处理对挤压Mg-5.5Zn-1.7Nd-0.7Cd-0.5Zr镁合金组织和性能的影响[J].特种铸造及有色合金,2010,30(12):1099-1101+1072.

Liu Xianlan1, Liu Chuming1, Zhang Yuwen2, et al. Effects of Heat Treatment on Microstructure and Mechanical Properties of Extruded Mg-5.5Zn-1.7Nf-0.7Cd-0.5Zr Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys 30(12):1099-1101(2010)
[1]刘先兰,刘楚明,张文玉,李慧中,曾苏民.热处理对挤压Mg-5.5Zn-1.7Nd-0.7Cd-0.5Zr镁合金组织和性能的影响[J].特种铸造及有色合金,2010,30(12):1099-1101+1072. DOI：

Liu Xianlan1, Liu Chuming1, Zhang Yuwen2, et al. Effects of Heat Treatment on Microstructure and Mechanical Properties of Extruded Mg-5.5Zn-1.7Nf-0.7Cd-0.5Zr Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys 30(12):1099-1101(2010) DOI：

摘要

采用光学显微镜及透射电镜研究了挤压变形Mg-5.5Zn-1.7Nd-0.7Cd-0.5Zr镁合金在不同热处理条件下的组织和性能。结果表明

经T6（固溶420℃×20h+时效200℃×20h）处理后

合金的抗拉强度和屈服强度低于挤压态

而经过T5（时效120℃×15h）处理后

高于挤压态;在T5工艺条件下

合金具有较好的力学性能

其抗拉强度σb=349MPa

屈服强度σ0.2=315MPa

伸长率δ=13%。

Abstract

Effects of different heat treatment conditions on microstructure and mechanical properties of extruded Mg-5.5Zn-1.7Nf-0.7Cd-0.5Zr magnesium alloy were investigated by OM （optical microscope） and TEM （transmission electron microscope）. The results indicate that ultimate tensile strength and yield strength of as-extruded alloy are superior to those of T6 treated ones （solid solution at 420℃ for 20 hours and aging at 200℃ for 20 hours）

while it is lower than those of T5 treated ones （aging at 120℃ for 15 hours）. Desirable mechanical properties of the T5 treated alloy can be observed

where tensile strength and yield strength as well as elongation reach 349MPa

315MPa and 13%

respectively.