Effects of Low Temperature Pre-aging on Microstructure and Properties of ZM6 Magnesium Alloy

Li Yinan; Jiang Wenyong; Xin Beiping; Zhao Sicong; Shang Jizhang

doi:10.15980/j.tzzz.2015.10.027

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Effects of Low Temperature Pre-aging on Microstructure and Properties of ZM6 Magnesium Alloy
Vol. 35, Issue 10, Pages: 1097-1100(2015)
Published： 2015 ，
DOI： 10.15980/j.tzzz.2015.10.027

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[1]李轶楠,姜文勇,辛北平,赵思聪,商继章.低温预时效对ZM6镁合金组织和性能的影响[J].特种铸造及有色合金,2015,35(10):1097-1100.

Li Yinan, Jiang Wenyong, Xin Beiping, et al. Effects of Low Temperature Pre-aging on Microstructure and Properties of ZM6 Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys 35(10):1097-1100(2015)
[1]李轶楠,姜文勇,辛北平,赵思聪,商继章.低温预时效对ZM6镁合金组织和性能的影响[J].特种铸造及有色合金,2015,35(10):1097-1100. DOI： 10.15980/j.tzzz.2015.10.027.

Li Yinan, Jiang Wenyong, Xin Beiping, et al. Effects of Low Temperature Pre-aging on Microstructure and Properties of ZM6 Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys 35(10):1097-1100(2015) DOI： 10.15980/j.tzzz.2015.10.027.

摘要

通过金相显微镜、万能拉伸试验机、布氏硬度计、扫描电镜

研究了低温预时效对ZM6镁合金组织和性能的影响。结果显示

随着预时效温度的升高

ZM6镁合金光学显微组织没有明显变化

平均晶粒尺寸在39.88

1.67μm之间;合金的布氏硬度和抗拉强度整体上呈现先增加后下降的趋势。ZM6镁合金在100℃×4h+200℃×8h的双级时效后

综合力学性能最佳

其中硬度HBS为80.7

抗拉强度为260 MPa。合金断口比较平坦

断裂方式多为沿晶断裂并伴随有部分穿晶断裂

以解理断裂为主。

Abstract

Influences of different low temperature pre-aging on microstructure and mechanical properties of the ZM6 magnesium alloy were analyzed by optical microscopy

universal tensile testing machine

electronic brinell hardness tester

scanning electron microscopy.The results reveal that with the increase of pre-aging temperature

microstructure of the alloy has absent change

and the average gain size is in range from 39.88μm to 41.67μm.The brinell hardness and tensile strength of alloy are increased firstly and then decreased.The ZM6 magnesium exhibits the desirable comprehensive mechanical properties after two-stage aging of 100 ℃×4h+200 ℃×8h

where the hardness and the tensile strength reach（HBS）80.7and 260 MPa

respectively.The fracture morphology of alloy is flat

and fracture mechanism is characterized by intergranular fracture companied with transgranular fracture partly.Cleavage fracture is dominant with different between size and depth cleavage step.