金属加工（热加工）Issue(5)：76-83,8.
6005A-T6铝合金型材静轴肩搅拌摩擦焊接头微观组织与力学性能
Microstructure and mechanical properties of stationary shoulder stir friction welded joints of 6005A-T6 aluminum alloy sections
付宁宁 1郭丹 1丁亚萍 1孙博 2潘书华 2蒲炯2
作者信息
- 1. 中车南京浦镇车辆有限公司 江苏南京 210031
- 2. 航天工程装备(苏州)有限公司 江苏苏州 215104
- 折叠
摘要
Abstract
A 6005A-T6 aluminum alloy sections was subjected to stationary shoulder friction stir welding.The microstructure and mechanical properties of butt-lap joints produced by stationary shoulder friction stir welding were investigated using an optical microscope,microhardness tester,electronic universal testing machine and high-frequency fatigue testing machine.The results demonstrate that the microstructure of the butt-lap joint in the stir zone was occurred dynamic recrystallization,resulting in the formation of fine equiaxed grains with an average size of approximately 5 μm.In contrast,the grain size in the heat affected zone was significantly larger,reaching an average of about 100μm.The results of the hardness test indicate that the hardness of joint exhibits a "W"distribution pattern.The mean yield strength,ultimate tensile strength and elongation of the welded joints were found to be 143MPa,191MPa and 3.53％,respectively.It was observed that all the joint tensile specimens fractured in the heat affected zone.The median fatigue limit of the joint under the condition of 1×107 cycles is 112MPa,while the lower fatigue limit of the joint is 90MPa when the confidence level is 95％ and the probability of failure is 5％.This study provides fundamental theoretical data for the application of stationary shoulder friction stir welding technology in the manufacturing of aluminum alloy car bodies.关键词
静轴肩搅拌摩擦焊/6005A-T6铝合金/微观组织/力学性能Key words
stationary shoulder friction stir welding/6005A-T6 aluminum alloy/microstructure/mechanical properties引用本文复制引用
付宁宁,郭丹,丁亚萍,孙博,潘书华,蒲炯..6005A-T6铝合金型材静轴肩搅拌摩擦焊接头微观组织与力学性能[J].金属加工（热加工）,2025,(5):76-83,8.
