Effects of FSP on Working Hardening Rate and Mechanical Properties of AZ31 Magnesium Alloy Extrusion Profile

Yang Xiaomin; Dong Feng; Liu Shoufa

doi:10.15980/j.tzzz.2017.08.028

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Effects of FSP on Working Hardening Rate and Mechanical Properties of AZ31 Magnesium Alloy Extrusion Profile
Vol. 37, Issue 8, Pages: 911-913(2017)
Published： 2017 ，
DOI： 10.15980/j.tzzz.2017.08.028

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[1]杨晓敏,董锋,刘守法.FSP对AZ31合金型材加工硬化率及力学性能的影响[J].特种铸造及有色合金,2017,37(08):911-913.

Yang Xiaomin, Dong Feng, Liu Shoufa. Effects of FSP on Working Hardening Rate and Mechanical Properties of AZ31 Magnesium Alloy Extrusion Profile. [J]. Special Casting & Nonferrous Alloys 37(8):911-913(2017)
[1]杨晓敏,董锋,刘守法.FSP对AZ31合金型材加工硬化率及力学性能的影响[J].特种铸造及有色合金,2017,37(08):911-913. DOI： 10.15980/j.tzzz.2017.08.028.

Yang Xiaomin, Dong Feng, Liu Shoufa. Effects of FSP on Working Hardening Rate and Mechanical Properties of AZ31 Magnesium Alloy Extrusion Profile. [J]. Special Casting & Nonferrous Alloys 37(8):911-913(2017) DOI： 10.15980/j.tzzz.2017.08.028.

摘要

对AZ31镁合金挤压型材实施了搅拌摩擦加工（Friction Stir Processing·FSP）

利用光学显微镜和拉伸试验机研究了搅拌摩擦加工对试样加工硬化率及力学性能的影响。结果表明

AZ31镁合金经搅拌摩擦加工后

晶粒得到细化

均匀伸长率和总伸长率相近

室温伸长率达22%;拉伸应变超过0.03时

搅拌区材料的加工硬化率超过母材

此时搅拌区和母材的显微组织中均出现变形孪晶

不同的是搅拌区材料的变形孪晶整体呈带状分布

且加工硬化率也较高。

Abstract

The friction stir processing（FSP）experiment was carried out on AZ31 magnesium alloy extrusion profile.The effects of FSP on the working hardening rate and mechanical properties of the samples were investigated by means of optical microscope and sample stretching equipment.The results reveal that the grain of AZ31 magnesium alloy is refined by frictional stirring processing.The uniform elongation and the total elongation are similar（about 22%）.When the tensile strain is more than 0.03

the working hardening rate of the alloy in the stirring zone is more than the base material

and the deformed twin crystals can be observed both in the stirring zone and base metal.The deformed twin crystals in the stirring zone exhibit a ribbon distribution

leading to the higher working hardening rate.