本文采用耦合的欧拉–拉格朗日方法,构建了添加中间金属的铝镁异质合金搅拌摩擦焊的数值分析模型。针对两种不同配置进行了研究:一种是搅拌头轴线与焊缝中心线重合(配置1),另一种是搅拌头轴线向铝合金偏置1 mm (配置2)。研究结果显示,配...本文采用耦合的欧拉–拉格朗日方法,构建了添加中间金属的铝镁异质合金搅拌摩擦焊的数值分析模型。针对两种不同配置进行了研究:一种是搅拌头轴线与焊缝中心线重合(配置1),另一种是搅拌头轴线向铝合金偏置1 mm (配置2)。研究结果显示,配置1的材料流动更为充分。在前进侧,铝合金主要从搅拌头前方水平流动至后退侧;而在后退侧,一部分镁合金从搅拌头后方水平流动至前进侧,另一部分则从搅拌头后方向板厚底部流动,随后在螺纹搅拌针的作用下继续向板厚上方流动。根据材料流动范围,可将接头横截面划分为轴肩影响区和搅拌针影响区。中间金属的流动分为3个区域。配置2在轴肩影响区和搅拌针影响区的铝/镁截面都更为光滑和规则。由于材料流动的不充分,所以配置2在接头内部形成了“隧道”缺陷。展开更多
Joining of dissimilar metals will offer many advantages in transportation sectors such as fuel consumption,weightreduction and emission reduction.However,joining of aluminium(Al)alloys with magnesium(Mg)alloys by fusi...Joining of dissimilar metals will offer many advantages in transportation sectors such as fuel consumption,weightreduction and emission reduction.However,joining of aluminium(Al)alloys with magnesium(Mg)alloys by fusion welding processis very complicated.Friction stir welding(FSW)is a feasible method to join these two dissimilar alloys.Mixing these two metalstogether in stir zone(SZ)leads to poor corrosion resistance.In this investigation,an attempt has been made to understand thecorrosion resistance of SZ of FSWed dissimilar joints of AA6061Al alloy and AZ31B Mg alloy.Potentiodynamic polarization testwas conducted by varying chloride ion concentration,pH value of the NaCl solution and exposure time.The corroded surfaces wereanalyzed using optical microscopy,scanning electron microscopy and XRD techniques.Of these three factors investigated,exposuretime is found to be the most significant factor to influence the corrosion behaviour of SZ of friction stir welded dissimilar joints ofAl/Mg alloys.展开更多
文摘本文采用耦合的欧拉–拉格朗日方法,构建了添加中间金属的铝镁异质合金搅拌摩擦焊的数值分析模型。针对两种不同配置进行了研究:一种是搅拌头轴线与焊缝中心线重合(配置1),另一种是搅拌头轴线向铝合金偏置1 mm (配置2)。研究结果显示,配置1的材料流动更为充分。在前进侧,铝合金主要从搅拌头前方水平流动至后退侧;而在后退侧,一部分镁合金从搅拌头后方水平流动至前进侧,另一部分则从搅拌头后方向板厚底部流动,随后在螺纹搅拌针的作用下继续向板厚上方流动。根据材料流动范围,可将接头横截面划分为轴肩影响区和搅拌针影响区。中间金属的流动分为3个区域。配置2在轴肩影响区和搅拌针影响区的铝/镁截面都更为光滑和规则。由于材料流动的不充分,所以配置2在接头内部形成了“隧道”缺陷。
基金Council of Scientific and Industrial Research (CSIR), New Delhi, India, for the financial support to carry out this investigation through sponsored project No. 22(0615)/13/EMR-II dated 26.02.2013
文摘Joining of dissimilar metals will offer many advantages in transportation sectors such as fuel consumption,weightreduction and emission reduction.However,joining of aluminium(Al)alloys with magnesium(Mg)alloys by fusion welding processis very complicated.Friction stir welding(FSW)is a feasible method to join these two dissimilar alloys.Mixing these two metalstogether in stir zone(SZ)leads to poor corrosion resistance.In this investigation,an attempt has been made to understand thecorrosion resistance of SZ of FSWed dissimilar joints of AA6061Al alloy and AZ31B Mg alloy.Potentiodynamic polarization testwas conducted by varying chloride ion concentration,pH value of the NaCl solution and exposure time.The corroded surfaces wereanalyzed using optical microscopy,scanning electron microscopy and XRD techniques.Of these three factors investigated,exposuretime is found to be the most significant factor to influence the corrosion behaviour of SZ of friction stir welded dissimilar joints ofAl/Mg alloys.
