Formation Mechanism of Twins in AZ61 Magnesium Alloy during Aging

Shi Huiying; Chen Zishan; Zhang Jumei; Jiang Bailing

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Formation Mechanism of Twins in AZ61 Magnesium Alloy during Aging
Vol. 29, Issue 9, Pages: 867-869(2009)
Published： 2009 ，
DOI：

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[1]时惠英,陈梓山,张菊梅,蒋百灵.时效处理AZ61铸造镁合金中孪晶的形成机理[J].特种铸造及有色合金,2009,29(09):867-869+783.

Shi Huiying, Chen Zishan, Zhang Jumei, et al. Formation Mechanism of Twins in AZ61 Magnesium Alloy during Aging. [J]. Special Casting & Nonferrous Alloys 29(9):867-869(2009)
[1]时惠英,陈梓山,张菊梅,蒋百灵.时效处理AZ61铸造镁合金中孪晶的形成机理[J].特种铸造及有色合金,2009,29(09):867-869+783. DOI：

Shi Huiying, Chen Zishan, Zhang Jumei, et al. Formation Mechanism of Twins in AZ61 Magnesium Alloy during Aging. [J]. Special Casting & Nonferrous Alloys 29(9):867-869(2009) DOI：

摘要

研究了AZ61铸造镁合金时效处理后组织中大量楔形孪晶的形成机理

并分析了时效处理对合金力学性能的影响。结果表明

时效处理前合金中存在大量的板条状亚结构和晶粒内部适当的Al的摩尔浓度梯度是导致孪晶形成的主要因素

时效处理后合金的屈服强度和抗拉强度分别由铸态的88.79MPa和189.73MPa上升至109.18MPa和250.03MPa

伸长率由6.93%上升至9.40%

合金的强度和韧性均得到改善。

Abstract

Formation mechanism of wedge twins in AZ61 magnesium alloy during aging was investigated by OM （optical microscope）

TEM （transmission electron microscope） and EDS （energy dispersive spectrometer）

and effects of aging treatment on mechanical properties of the alloy were described. It is found that formation of wedge twins is attributed to the existence of large amounts of plate-like substructure in the alloy and proper Al atom concentration gradient in the grain. The yield strength

tensile strength and elongation of the alloy are increased from 88.79 MPa

189.73MPa

6.93%

in as-cast state respectively

to 109.18MPa

250.03MPa

9.40%

in aged state

respectively

greatly improving the strength and ductility.