Improving Joint Morphologies and Tensile Strength of Al/Mg Dissimilar Alloys Friction Stir Lap Welding by Changing Zn Interlayer Thickness
Improving Joint Morphologies and Tensile Strength of Al/Mg Dissimilar Alloys Friction Stir Lap Welding by Changing Zn Interlayer Thickness
复制标题
改变Zn层厚度改善Al/Mg异种合金搅拌摩擦搭接焊接头形貌和拉伸强度
DOI：
10.1007/s40195-019-00937-9
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Lv Zan
中科院分区：
文献类型：
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作者：
Liu Jinglin;Niu Shiyu;Ren Rong;Ji Shude;Wang Lei;Lv Zan
为提高7075-T6 Al与AZ31B Mg异种合金搅拌摩擦搭接接头的质量，选用不同厚度（0.02、0.05、0.1、0.2、0.3 mm）的纯Zn箔作为夹层。分析了层间厚度对接头形成、组织和抗拉强度的影响。结果表明：添加0.05 mm厚度的Zn中间层可获得下板搅拌区与热机械影响区边界的最大长度；Mg-Zn金属间化合物（IMCs）在SZ中呈不连续分布，取代了连续的Al-Mg金属间化合物。随着锌层厚度的增加，Mg-Zn IMCs的尺寸增大。添加0.05 mm锌箔后，接头的最大抗拉剪切强度为276 N mm~(-1)，比未添加锌箔时提高了45.6%。
The pure Zn foils with diff erent thicknesses (0.02,0.05,0.1,0.2 and 0.3 mm) were selected as interlayers to improve the quality of friction stir lap welding joint of 7075-T6 Al and AZ31B Mg dissimilar alloys.The eff ects of the interlayer thickness on joint formation,microstructure and tensile strength were analyzed.The results displayed that the maximum length of the boundary between stir zone (SZ) and thermo-mechanically aff ected zone in lower plate was obtained by the addition of the Zn interlayer with 0.05 mm thickness.The Mg–Zn intermetallic compounds (IMCs) were discontinuously distributed in the SZ,replacing the continuous Al–Mg IMCs.The size of Mg–Zn IMCs increased with the increase in the thickness of the Zn interlayer.The maximum tensile shear strength of 276 N mm~(–1) was obtained by the addition of 0.05 mm Zn foil,which increased by 45.6% of that of the joint without the Zn foil addition.