6005A-T5铝合金搅拌摩擦焊接头组织与疲劳性能

doi:10.11896/cldb.20030110

材料导报

2021, Vol. 35

Issue (2): 2092-2097 https://doi.org/10.11896/cldb.20030110

金属与金属基复合材料

6005A-T5铝合金搅拌摩擦焊接头组织与疲劳性能

刘敬萱^1,2,3, 沈健^1,3, 李锡武^1,2,3, 闫丽珍^1,2,3, 闫宏伟^1,2, 刘宏伟^1,2, 温凯^1,2, 李亚楠^1,2

1 有研科技集团有限公司有色金属材料制备加工国家重点实验室,北京 100088;
2 有研工程技术研究院有限公司,北京 101407;
3 北京有色金属研究总院,北京 100088

Microstructure and Fatigue Properties of Friction Stir Welded 6005A-T5 Aluminum Alloy

LIU Jingxuan^1,2,3, SHEN Jian^1,3, LI Xiwu^1,2,3, YAN Lizhen^1,2,3, YAN Hongwei^1,2, LIU Hongwei^1,2, WEN Kai^1,2,
LI Yanan^1,2

1 State Key Laboratory of Nonferrous Metals and Processes, GRINM Group Co., LTD., Beijing 100088, China;
2 GRIMAT Engineering Institute Co., LTD., Beijing 101407, China;
3 General Research Institute for Nonferrous Metals, Beijing 100088, China

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摘要本工作借助金相(OM)、电子背散射衍射(EBSD)、透射电子显微镜(TEM)、硬度和高周疲劳试验,研究不同焊接参数对6005A-T5铝合金搅拌摩擦焊(FSW)接头的显微组织与疲劳性能的影响。结果表明,焊接过程中焊核区(NZ)发生了动态再结晶,形成了尺寸细小的等轴晶粒,合金中的沉淀相发生回溶,NZ只存在尺寸细小、分布离散的GP区。热影响区(HAZ)晶粒形态和尺寸与母材基本相似,存在两种形态的沉淀相(β′相和Q′相)。搅拌头转速越大或焊接速度越小,均会提高相应的焊接热输入,过高的焊接热输入会降低FSW接头在10⁷循环周次下的疲劳强度。疲劳裂纹均在试样表面萌生,疲劳裂纹扩展初期为沿晶扩展,然后逐渐转变为穿晶扩展,断口形貌呈现解理断裂,最终失稳断裂转变为韧性断裂。

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	刘敬萱
	沈健
	李锡武
	闫丽珍
	闫宏伟
	刘宏伟
	温凯
	李亚楠

关键词: 6005A-T5铝合金搅拌摩擦焊组织显微硬度疲劳

Abstract: The effects of different welding parameters on microstructure and fatigue properties of 6005A-T5 aluminum alloy friction stir welding (FSW) joints were studied by optical microscopy (OM), electron backscattered diffraction (EBSD), transmission electron microscope (TEM), Vickers hardness, and high cycle fatigue tests. The results showed that dynamic recrystallization occurred in the nugget zone (NZ) during the welding process, resulting in the formation of fine equiaxed grains, and the precipitation phases dissolve back into the Al-matrix. The grain morphology and size in the heat affected zone (HAZ) are similar to that of the base material, and there are two kinds of precipitation phases (β′ phase and Q′ phase). The higher the rotating speed or the lower the welding speed of the tool means the higher welding heat input, which will reduce the fatigue strength of FSW joint under 10⁷ cycles. All the fatigue cracks were initiated on the surface of the samples. At the initial stage of fatigue crack propagation, the crack propagates along the grain boundary. As the crack continued to expand, it gradually turned into transgranular expansion, and the fracture morphology showed cleavage fracture, and finally the instability fracture turned into ductile fracture.

Key words: 6005A-T5 aluminum alloy friction stir welding microstructure microhardness fatigue

出版日期: 2021-01-25 发布日期: 2021-01-28

ZTFLH:

TG457.1

基金资助: 国家重点研发计划(2016YFB0300902;2016YFB0300905)

通讯作者: jshen@grinm.com

作者简介: 刘敬萱,2016年6月毕业于江西理工大学,获得工学硕士学位。现为北京有色金属研究总院博士研究生,目前主要从事轨道交通铝合金焊接方面的研究工作。
沈健,博士,北京有色金属研究总院教授,博士研究生导师。主要从事高强钛合金材料制备、新型Al-Li合金材料研制、高强高韧铝合金热轧组织控制与预测、旋压工艺与技术等方面的研究工作。在国内外重点学术刊物和学术会议上发表学术论文近80篇,多篇论文被SCI、EI等收录。获省部级科技进步一等奖1项、二等奖4项、三等奖2项。

引用本文:

刘敬萱, 沈健, 李锡武, 闫丽珍, 闫宏伟, 刘宏伟, 温凯, 李亚楠. 6005A-T5铝合金搅拌摩擦焊接头组织与疲劳性能[J]. 材料导报, 2021, 35(2): 2092-2097.
LIU Jingxuan, SHEN Jian, LI Xiwu, YAN Lizhen, YAN Hongwei, LIU Hongwei, WEN Kai, LI Yanan. Microstructure and Fatigue Properties of Friction Stir Welded 6005A-T5 Aluminum Alloy. Materials Reports, 2021, 35(2): 2092-2097.

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http://www.mater-rep.com/CN/10.11896/cldb.20030110 或 http://www.mater-rep.com/CN/Y2021/V35/I2/2092

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