Microstructure and Mechanical Properties Investigation of AZ31 Thick Plate Magnesium Alloy Double-Shield Friction Stir Welding Joint

CHEN Yuhua; ZHONG Yu; XIE Jilin; ZHANG Timing; WANG Shanlin; GE Junwei

doi:10.16080/j.issn1671-833x.2022.21.038

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Microstructure and Mechanical Properties Investigation of AZ31 Thick Plate Magnesium Alloy Double-Shield Friction Stir Welding Joint

更新时间：2025-10-30

- Microstructure and Mechanical Properties Investigation of AZ31 Thick Plate Magnesium Alloy Double-Shield Friction Stir Welding Joint
- Aeronautical Manufacturing Technology Vol. 65, Issue 21, Pages: 38-44(2022)
- 作者机构：
  
  1. 南昌航空大学江西省航空构件成形与连接重点实验室,南昌,330063
  2. 贵州航天天马机电科技有限公司,遵义,563000
- 作者简介：
- 基金信息：
- DOI：10.16080/j.issn1671-833x.2022.21.038
  CLC：
- Published：2022
- 稿件说明：
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陈玉华，钟宇，谢吉林，张体明，王善林，戈军委. AZ31 厚板镁合金双面搅拌摩擦焊接头组织及性能研究[J]. 航空制造技术, 2022, 65(21): 38-44,53.

CHEN Yuhua, ZHONG Yu, XIE Jilin, ZHANG Timing, WANG Shanlin, GE Junwei. Microstructure and Mechanical Properties Investigation of AZ31 Thick Plate Magnesium Alloy Double-Shield Friction Stir Welding Joint[J]. Aeronautical Manufacturing Technology, 2022, 65(21): 38-44,53.
陈玉华，钟宇，谢吉林，张体明，王善林，戈军委. AZ31 厚板镁合金双面搅拌摩擦焊接头组织及性能研究[J]. 航空制造技术, 2022, 65(21): 38-44,53. DOI： 10.16080/j.issn1671-833x.2022.21.038.

CHEN Yuhua, ZHONG Yu, XIE Jilin, ZHANG Timing, WANG Shanlin, GE Junwei. Microstructure and Mechanical Properties Investigation of AZ31 Thick Plate Magnesium Alloy Double-Shield Friction Stir Welding Joint[J]. Aeronautical Manufacturing Technology, 2022, 65(21): 38-44,53. DOI： 10.16080/j.issn1671-833x.2022.21.038.

摘要

采用单轴肩搅拌摩擦焊实现了40 mm 厚的AZ31 镁合金双面对接焊接，对接头组织及力学性能进行了分析研究。结果表明，双面搅拌摩擦焊（Ds–FSW）接头光滑整洁，无缺陷。接头可划分为母材（BM）区、热影响区（HAZ）、热力影响区（TMAZ）、焊核区（NZ）和重叠区（OZ）5 个区域，其中OZ 是Ds–FSW 接头所独有的。OZ 中存在的超细晶粒和弥散分布的沉淀相Al

，显著提高了此区域的极限抗拉强度（UTS）和断后伸长率（EI），分别为217.7 MPa 和14.65%，从而使其获得较高的接头强度系数，约为母材的85.81%。接头主要断裂在前进侧NZ 和TMAZ 交界处，其断裂机制为韧性断裂和准解离断裂的混合断裂机制。

Abstract

Single shoulder friction stir welding was used to achieve a 40 mm thick AZ31 magnesium alloy doublesided butt welding

the microstructure and mechanical properties of the joint were analyzed. The joint can be divided into five zones: base material (BM) zone

heat affected zone (HAZ)

thermal-mechanical affected zone (TMAZ)

nugget zone (NZ) and overlapped zone (OZ)

of which the OZ is unique to Ds–FSW joints. The existence of ultra-fine grains and diffusely distributed precipitated phase Al

in the OZ significantly increases the ultimate tensile strength (UTS) and elongation (EI) in this zone

respectively 217.7 MPa and 14.65%

resulting in a high joint efficiency ratio of about 85

.81% of the base material. The joints are mainly fractured at the junction of NZ and TMAZ on the advancing side

and their fracture mechanism is a mixture of ductile fracture and quasi-cleavage fracture.

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