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Abstract
In non-equilibrium conditions, the coring phenomena may occur in the α-Mg solid solution and γ-Mg17Al12 phase forms in the microstructure of AZ magnesium alloy series. This eutectic phase may introduce detrimental effect on workability of wrought alloys. In the present work, the dissolution characteristics of γ phase have been investigated in AZ31 wrought magnesium alloy. Considering the eutectic temperature of AZ31 alloy, the homogenization treatment was executed in temperature range of 300-437 ºC (i.e., somewhat below eutectic melting temperature of γ precipitate) and 437-500 ºC (i.e., higher eutectic melting temperature of γ precipitate) for different durations. A thorough microstructural investigation and also thermodynamic calculations were executed. The results indicated that the dissolution rate of γ phase is very low even at temperatures just below the eutectic point of the alloy, whereas it dramatically increases at temperatures higher than eutectic point. Moreover, it is suggested that partial melting of γ phase due to eutectic melting reaction (α+γ→L) may lead to reduced formability.
Highlights
IntroductionAs the lightest structural metallic material, magnesium alloys hold low density (almost two-thirds of aluminum), and possess high specific strength, excellent damping and good ecology properties (easy to recycle and abundant in resources)
As the lightest structural metallic material, magnesium alloys hold low density, and possess high specific strength, excellent damping and good ecology properties
Energy dispersive spectroscopy (EDS) results indicate that the second phases (i.e., γ-Mg17Al12 as well as few particles of Al-Mn compounds) are distributed either in grain interiors or along grain boundaries (Figure 1b and c)
Summary
As the lightest structural metallic material, magnesium alloys hold low density (almost two-thirds of aluminum), and possess high specific strength, excellent damping and good ecology properties (easy to recycle and abundant in resources). Owing to these desirable properties, magnesium alloys are attractive in electronic, aeronautical and transportation industries[1,2,3]. A thorough investigation of high temperature plastic deformation behavior of magnesium alloys is highly necessitated. This may assist enhancing the alloy workability which in turn plays an essential role in the industrialization of component fabrication. The important thermomechanical parameters such as temperature, strain rate and deformation ratio were considered, and yet less attention has been paid to the effects of second phase particles in initial microstructure
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