Abstract
In this paper, microstructure and mechanical properties of welded plates of VW75 magnesium alloy under different heat treatment conditions were studied. The results show that the eutectic microstructure along grain boundaries of weld zone all could decompose when the welded plates of VW75 magnesium alloy were heat treated at 480°C, 500°C and 520°C conditions. With increasing of solution temperature and solution time prolonging, the eutectic microstructure along grain boundaries of weld zone were dissolved more fully. When the welded plates of VW75 magnesium alloy were treated at mentioned above temperatures, the grain size of base metal all increased dramatically during the initial solution treatment. The average grain size of base metal increased from 13um to 50 ∼ 60um just for half hour. With increasing of solution temperature and solution time prolonging, the average grain size of base metal was continuously increased obviously to 80um. Compared with the process of aging treatment after solution, directly aging treatment at 220° for 10h was more benefit to maintaining the strength of the welded plates of VW75 magnesium alloy.
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