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首页> 外文期刊>Materials Science and Engineering >Dissimilar friction stir welding between aluminum alloy and magnesium alloy at a low rotational speed
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Dissimilar friction stir welding between aluminum alloy and magnesium alloy at a low rotational speed

机译：低转速下铝合金与镁合金的异种搅拌摩擦焊

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摘要

A sound weld was obtained between 2024-T3 Al alloy and AZ31B-O Mg alloy dissimilar metal plates of 5 mm thickness, at a rotational speed of 300 rev min~(-1) and at a welding speed of 50 mm min~(-1). One of the parameter studied was, the effect of interface offset variation, on the quality and properties of the welded samples and on the thickness of intermetallic layer formed in the welded samples. The intermetallic layer at the midst of the weld volume contains intermetallic compounds Al_(12)Mg_(17) and Al_3Mg_2. Highest tensile strength of 106.86 MPa, corresponding tensile joint efficiency of 44.52% and corresponding elongation 1.33% were obtained for the tensile sample, with interface offset of 0.66 mm from zero interface offset in retreating side and with approximate least intermetallic thickness of 1.2 μm. Dissimilar friction stir welded joint samples had failed completely in brittle fracture mode; the position of tensile fracture was located at the midst of intermetallic layer, which had maximum hardness and minimum ductility. The nano hardness values fluctuate in the weld nugget owing to dynamic recrystallization of alloy materials and formation of brittle intermetallic compounds of alloy materials in the weld nugget; maximum hardness of 10.74 GPa occurred for the sample with least intermetallic thickness of 1.2 μm.
机译：在2024-T3铝合金和厚度为5 mm的AZ31B-O Mg合金异种金属板之间，以300 rev min〜（-1）的旋转速度和50 mm min〜（-的焊接速度）之间进行了良好的焊接1）。研究的参数之一是界面偏移变化对焊接样品的质量和性能以及在焊接样品中形成的金属间层厚度的影响。焊缝中间的金属间层包含金属间化合物Al_（12）Mg_（17）和Al_3Mg_2。拉伸样品的最高拉伸强度为106.86 MPa，相应的拉伸接头效率为44.52％，相应的伸长率为1.33％，从后退侧的界面偏移量为零到界面偏移量为0.66 mm，金属间厚度最小约为1.2μm。不同的搅拌摩擦焊接接头样品在脆性断裂模式下完全失效。拉伸断裂的位置位于金属间层的中间，具有最大的硬度和最小的延展性。由于合金材料的动态再结晶和在焊核中合金材料的脆性金属间化合物的形成，纳米硬度值在焊核中会发生波动。金属间厚度最小为1.2μm的样品的最大硬度为10.74 GPa。

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