Weldability of friction stir welding of AZ91D magnesium alloy thixomolded sheet.
Weldability of friction stir welding of AZ91D magnesium alloy thixomolded sheet.
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AZ91D镁合金触变成型板材搅拌摩擦焊的焊接性能
DOI：
10.2464/jilm.51.528
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
M. Ushio
中科院分区：
文献类型：
--
作者：
K. Nakata;Seigo Inoki;Y. Nagano;T. Hashimoto;Shigetoshi Johgan;M. Ushio
通过改变工具转速和试件行进速度等连接参数，评价2 mm厚AZ91D镁合金触变成型板材的搅拌摩擦焊（FSW）焊接性能。采用轴肩直径12 mm、销钉直径3 mm、销钉长度2 mm的工具，在行进速度50 mm/min、工具转速1240~1750 rpm的最佳FSW条件下获得了质量良好的方形对接接头。较高的行进速度或较低的旋转速度会导致接头处缺乏粘合。接头中心部分的搅拌区由平均晶粒尺寸为2∼5μm的非常细小的再结晶组织组成。搅拌区的硬度随着平均晶粒尺寸的减小而略有增加。 FSW接头横向拉伸试验导致母材断裂。搅拌区的抗拉强度为330∼360 MPa，远高于母材的抗拉强度，约为250 MPa。
Weldability of Friction Stir Welding (FSW) of AZ91D magnesium alloy thixomolded sheet with 2 mm in thickness was evaluated by changing joining parameters of tool rotating speed and specimen travel speed. Square butt joint with good quality was obtained at the optimum FSW conditions of 50 mm/min of travel speed with 1240 to 1750 rpm of tool rotating speed by using a tool with 12 mm of shoulder diameter, 3 mm of pin diameter and 2 mm of pin length. Higher travel speed or lower rotating speed made a lack of bonding in the joint. Stir zone in a central part of the joint consisted of very fine recrystallized structure with 2∼5 μm in mean grain size. Hardness of stir zone increased slightly with decreasing mean grain size. Transverse tensile test of FSW joint resulted in the fracture at base metal. The tensile strength of stir zone showed 330∼360 MPa, much higher than that of base metal, about 250 MPa.