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| INFLUENCE OF HEAT TREATMENT ON MICROSTRUCTURES AND PROPERTIES OF WELDED JOINTS FOR Al-Mg-Sc ALLOY SHEETS |
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| 中南大学材料科学与工程学院 |
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Cite this article:
. INFLUENCE OF HEAT TREATMENT ON MICROSTRUCTURES AND PROPERTIES OF WELDED JOINTS FOR Al-Mg-Sc ALLOY SHEETS. Acta Metall Sin, 2008, 44(10): 1277-1280 .
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Abstract In this research, Al-Mg-Sc alloy sheets were welded by manual TIG(tungsten inert gas) welding method with Al-Mg-Sc-Zr welding wire as filling material, and the welded joints were processed heat treatment after welding under 350℃for 1h. Mechanical properties and microstructures of welded joints without and with heat treatment were studied comparatively using tensile test, micro-hardness measurement, SEM and TEM analysis methods. The results show that：as the result of 350℃/1h heat treatment, tensile strength and elongation percentage of welded joints increased to 410Mpa and 14.4%from 332 MPa and 5.6% correspondingly, which were that of without heat treatment, and welded joint coefficient reached to 0.98. After heat treatment, micro-hardness of welded zone was raised greatly, and failure position was fusion zone instead of welded zone. On the process of heat treatment, large amounts of Al3(Sc, Zr) particles, which are coherent with matrix, precipitated and deposited uniformly in the welded zone, leading to great improvement of hardness, tensile strength and yield strength of welded zone.
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Received: 05 March 2008
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