），熱影響區(qū)晶粒尺寸較大（約 <img src="/qkimages/jsjr/jsjr202505/jsjr20250509-2-l.jpg" with="40px" style="vertical-align: middle;"> ）。硬度測試結(jié)果顯示，接頭硬度近似呈現(xiàn)“W”形分布。焊接接頭的平均屈服強(qiáng)度、抗拉強(qiáng)度和伸長率分別為<img src="/qkimages/jsjr/jsjr202505/jsjr20250509-3-l.jpg" with="58px" style="vertical-align: middle;"> ， <img src="/qkimages/jsjr/jsjr202505/jsjr20250509-4-l.jpg" with="41px" style="vertical-align: middle;"> 和 3 . 5 3 % ，接頭拉伸試樣均斷裂于熱影響區(qū)。鎖底接頭在 <img src="/qkimages/jsjr/jsjr202505/jsjr20250509-5-l.jpg" with="50px" style="vertical-align: middle;"> 循環(huán)周次條件下的中值疲勞極限為 1 1 2 M P a ；當(dāng)置信度為 9 5 % 和失效概率為 5 % 時(shí)，接頭的疲勞下極限為 <img src="/qkimages/jsjr/jsjr202505/jsjr20250509-6-l.jpg" with="64px" style="vertical-align: middle;"> 。本研究為靜軸肩攪拌摩擦焊接技術(shù)在鋁合金車體制造中的應(yīng)用提供基礎(chǔ)理論數(shù)據(jù)。-龍?jiān)雌诳W(wǎng)" />

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6005A-T6鋁合金型材靜軸肩攪拌摩擦焊接頭微觀組織與力學(xué)性能

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Abstract： A 6Oo5A-T6 aluminum aloy 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 anoptical microscope，microhardness tester，electronicuniversal testing machine and highfrequency fatigue testing machine.The results demonstrate that the microstructure of the but-lap joint in the stir Zone was occurrd dynamic recrystallization，resulting in the formation of fine equiaxed grains with an average size of approximately . In contrast，the grain size in the heat affected zone was significantly larger，reaching an average of about 1 0 0 μ m .The results of the hardness test indicate that the hardness of joint exhibits a“W” distribution patern.Themean yield strength，ultimate tensilestrength and elongation of the welded joints were found to be ，191MPaand 3 . 5 3 % ，respectively. It was observed that all the joint tensile specimens fractured in the heat afected zone.The median fatigue limit of the joint under the condition of cycles is 1 1 2 M P a ，while the lower fatigue limit of the joint is when the confidence level is 9 5 % and theprobabilityof 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.

Keywords： stationary shoulder friction stir welding; 6Oo5A-T6 aluminum alloy; microstructure; mechanical properties

1序言

2 試驗(yàn)材料與方法

攪拌摩擦焊（FrictionStirWelding，F(xiàn)SW）技術(shù)自問世以來，已展現(xiàn)出廣闊的應(yīng)用前景，在工程上也得到了廣泛應(yīng)用[1-3]。（剩余7556字）

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