铝锂合金无针搅拌摩擦点焊接头组织演变与强化机制研究

doi:10.3901/JME.2024.02.150

机械工程学报 ›› 2024, Vol. 60 ›› Issue (2): 150-158.doi: 10.3901/JME.2024.02.150

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铝锂合金无针搅拌摩擦点焊接头组织演变与强化机制研究

褚强^1,2, 杨夏炜¹, 李文亚¹, 范文龙¹, 邹阳帆¹, 郝思洁¹

1. 西北工业大学材料学院西安 710072;
2. 西安航天发动机有限公司西安 710100

收稿日期:2023-03-01 修回日期:2023-08-25 出版日期:2024-01-20 发布日期:2024-04-09
作者简介:褚强，男，1991年出生，博士。主要研究方向为液体火箭发动机焊接技术。E-mail：chuqiang413@163.com
杨夏炜，男，1982年出生，博士，副教授，博士研究生导师。主要研究方向为高温合金、钛合金线性摩擦焊等。E-mail：yangxiawei@nwpu.edu.cn
基金资助:
西北工业大学重点实验室开放课题(SKLSP202216)、国家自然科学基金(52105402)和陕西省自然科学基金(2021JQ-102)资助项目。

Microstructure Evolution and Strengthening Mechanism of the Probeless Friction Stir Spot Welding of a Al-Li Alloy

CHU Qiang^1,2, YANG Xiawei¹, LI Wenya¹, FAN Wenlong¹, ZOU Yangfan¹, HAO Sijie¹

1. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072;
2. Xi’an Aerospace Engine Co., Ltd., Xi’an 710100

Received:2023-03-01 Revised:2023-08-25 Online:2024-01-20 Published:2024-04-09

摘要/Abstract

摘要： 将2198铝锂合金无针搅拌摩擦点焊作为研究对象，围绕点焊接头微观组织与强化机制开展研究。结果表明，组织细化受连续动态再结晶、应变的几何效应和非连续动态再结晶的共同作用。其中，连续动态再结晶是主要的再结晶机制，同时伴随着剪切织构AA/({111}<110>)，B/({112}<110>)，A1*/A2*({111}<112>)。焊接过程中析出相同样发生了显著变化，与母材晶体结构呈现半共格/非共格特征的T1相受焊接热循环影响发生粗化或固溶，搅拌区析出相几乎完全固溶，仅观察到少量弥散的与母材晶体共格的β'相，其强化效应明显减弱。无针搅拌摩擦点焊(Probeless friction stir spot welding，P-FSSW)接头非均匀组织特征导致其强化机制由析出强化和形变强化逐渐转变为细晶强化和固溶强化。

关键词: 铝锂合金, 搅拌摩擦点焊, 微观组织, 强化机制

Abstract: The microstructure evolution and strengthening mechanism of probeless friction stir spot welded (P-FSSW) joints of 2198 Al-Li alloy are studied. The results show that the stir zone (SZ) is characterized by equiaxed grains, which is dominated by the continuous dynamic recrystallization, but the geometrical effect of imposed strain and limited discontinuous recrystallization are also involved. It is accompanied by shear textures, like A/({111}<110>), B/({112}<110>), A1*/A2*({111}<112>), which is attributed to the plastic flow induced by shear action. In addition, the primary strengthening phase of T1(Al₂CuLi), which is semi-coherent/incoherent with the crystal structure of the base metal, is completely dissolved in the stir zone (SZ), but only a few of dispersed β' phases are observed. The combined effect of extensive dissolution of the strengthening phases and reduction of dislocation density due to thermal cycle significantly decrease the hardness in the joint, while grain refinement and solution strengthening are considered as main factors affecting the SZ.

Key words: aluminum-lithium alloy, friction stir spot welding, microstructure, strengthening mechanism

中图分类号:

TG453

褚强, 杨夏炜, 李文亚, 范文龙, 邹阳帆, 郝思洁. 铝锂合金无针搅拌摩擦点焊接头组织演变与强化机制研究[J]. 机械工程学报, 2024, 60(2): 150-158.

CHU Qiang, YANG Xiawei, LI Wenya, FAN Wenlong, ZOU Yangfan, HAO Sijie. Microstructure Evolution and Strengthening Mechanism of the Probeless Friction Stir Spot Welding of a Al-Li Alloy[J]. Journal of Mechanical Engineering, 2024, 60(2): 150-158.

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铝锂合金无针搅拌摩擦点焊接头组织演变与强化机制研究

Microstructure Evolution and Strengthening Mechanism of the Probeless Friction Stir Spot Welding of a Al-Li Alloy

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