Phase and Morphological Transformation of Preformed AZ91D Magnesium Alloys in Remelting

Effects of different processing parameters on the semisolid microstructure of the AZ91D alloy during partial remelting

“…Both above Eqs. (13) and (14) are put into Eq. (12), the corresponding equation will be integrated and expressed as follows: If Eqs.…”

“…The partial remelting heat treatment is the most important aspect affecting the semisolid microstructures during the strain induced melting activation process [14]. So far, many researchers [7,13,15,16] have studied the effect of partial remelting, such as temperature and holding time, on the semisolid microstructure of the magnesium alloy.…”

“…The aim of partial remelting is to produce the slurry with superior thixotropy, which is favorable for the sequent thixoforming. In principle, during partial remelting, the alloy was heated in the semisolid state, namely that within the temperature range where the solid and liquid phases coexist in equilibrium [13]. The partial remelting heat treatment is the most important aspect affecting the semisolid microstructures during the strain induced melting activation process [14].…”

Effect of initial as-cast microstructure on semisolid microstructure of AZ91D alloy during the strain-induced melt activation process

“…It omits the procedure of molten metal treatment and is applicable for both low and high melting point alloys [10]. During the SIMA process, the oxidation and combustion problems of magnesium alloy can be effectively reduced to attain pure alloys and make the semisolid thixocasting/rheocasting easy [14]. SIMA process consists of the following stages [9,13].…”

“…The strain-induced melt activation (SIMA) process, developed by Young [13,14] in the 1980s, as one of the methods of attaining the globular grains in the semisolid microstructure, has been frequently researched in fabricating semisolid aluminum and zinc alloys and widely regarded as an ideal method for semisolid processing. Compared with other initial semisolid material processing methods, such as magneto-hydrodynamic stirring, mechanical stirring, spray stirring and semisolid isothermal heat-treatment [7][8][9]12,15,16], SIMA process has several 0925 advantages.…”