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| EFEECT OF FRICTION STIR WELDING PARAMETERS ON MICROSTRUCTURES AND MECHANICAL PROPERTIES OF ZK60 MAGNESIUM ALLOY JOINTS |
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| 中国科学院金属研究所 |
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Cite this article:
. EFEECT OF FRICTION STIR WELDING PARAMETERS ON MICROSTRUCTURES AND MECHANICAL PROPERTIES OF ZK60 MAGNESIUM ALLOY JOINTS. Acta Metall Sin, 2008, 44(6): 665-670 .
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Abstract Six millimeters thick ZK60 alloy plates were successfully friction stir welded (FSW). The sound welded joints were achieved under a wide range of welding parameters (rotation rate of 600-800 rpm and traverse speed of 50-200 mm/min). After FSW, the coarse grains in ZK60 alloy were changed to fine equiaxed recrystallized grains at the nugget zone. Furthermore, the coarse MgZn2 particles were broken up and mostly dissolved into the matrix. For this ZK60 magnesium alloy, the precipitation strengthening effect was more dominant than fine-grain strengthening effect. Therefore, hardness values of the nugget zone were lower than those of the PM and the fracture occurred at the nugget zone. At low heat input parameters (≤800 rpm), the grain size of the nugget zone, and the tensile strength and elongation of welded joints at different parameters were similar, but at high heat input parameter (1200 rpm), the grains of the nugget zone became large and the tensile strength of welded joints slightly decreased. After aging treatment, the strength and elongation of welded joints under different parameters increased and their mechanical properties were similar.
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Received: 23 November 2007
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