Microstructures and Mechanical Properties of AZ91 Magnesium Alloy Castings Joint by Friction Stir Welding
Microstructures and Mechanical Properties of AZ91 Magnesium Alloy Castings Joint by Friction Stir Welding
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AZ91镁合金铸件搅拌摩擦焊接头的显微组织与力学性能
DOI：
10.2464/jilm.55.259
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
K. Katoh
中科院分区：
文献类型：
--
作者：
K. Katoh
对5mm厚的AZ91镁合金铸件进行搅拌摩擦焊。研究了搅拌摩擦焊接头的显微组织和力学性能。无论在何种焊接条件下，搅拌区的显微组织均比母材细小。接头的抗拉强度均高于母材。接头的抗拉强度和延伸率与母材相同。所有拉伸试验接头均在母材处断裂。无论在何种焊接条件下，接头的冲击值均高于母材，最大冲击值为母材的295%。搅拌摩擦焊接过程的最高温度为669K，且随着焊接速度的增加而降低。焊接力随焊接速度的增加而增大，随旋转速度的增加而减小。
AZ91 magnesium alloy castings plate with 5 mm thickness was friction stir welded. The microstructures and mechanical properties of FSW joints were investigated. Regardless of the welding conditions, the microstructures of stirred zone showed finer than that of the base metal. Tensile strength of all the joints showed higher value than that of the base metal. The tensile strength and elongation of joints showed as same as base metals. All the tensile tested joints were fractured at the base metal. Regardless of the welding conditions, the impact value of joints showed higher value than that of the base metal, and the maximum impact value of joint was 295% of the base metal. The highest temperature of the friction stir welding process showed 669K, and it decreased with increasing welding speed. The welding force increased with increasing welding speed, and decreased with increasing rotational speed of tool.