Microstructure in Weld Heat Affected Zone of Al-Mg-Si Alloy(MATERIALS METALLURGY AND WELDABILITY)
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An investigation has been made into the microstructure of weld heat affected zone (HAZ) in commercial AI-Mg-Si system 6063-T5 alloy. The precipitation amounts of G.P. zones, β' precipitates, β phase and relatively insoluble compounds respectively in the HAZ can be evaluated quantitatively by means of electrical resistivity measurement of an isochronal annealing technique. The partial or all disolution of G.P. zones and β' precipitates occurs in a narrow band of the HAZ where the temperature has reached above 240℃ during welding. The softening zone remains in these parts of HAZ in spite of natural aging after welding. The softening zone can be considerably improved by means of artificial aging treatment at 180℃ for 8 hours after welding.
- 大阪大学の論文
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