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-step reheating process can restrain the coalescence of grains to a certain extent, and thus refine the grain size and promote the grain spheroidization. Key words: semi-solid metal... spheroidization. References [1] FLEMINGS M C. Behavior of metal alloys in the semi-solid state [J]. Metall Trans A, 1991, A22: 957-981. [2] FAN Z. Semisolid metal processing [J]. Int Mater Rev......
exposure provokes spheroidization and coarsening of eutectic Si particles. The ultimate tensile strength of the HPDC alloy after thermal exposure is higher than that of the PMC alloy at room temperature... means that the load bearing capacity of the alloys is decreased after thermal exposure. The spheroidization of the Si particles is believed to be the main mechanism for the high elongation. According......
are composed of fine equiaxed grains. When the billets are remelted at 575 ℃ for 30?60 min, spheroidization of the semisolid billet is perfect. When the mould preheating temperature is 400?450......
of mechanical properties of alloy during solution heat treatment are due to the combined effect of dissolution of the intermetallic phases, uniformity of structure and spheroidization of silicon......
elongation of YL112 alloy, and the heat treatment can further enhance the mechanical properties. The spheroidization process of eutectic silicon in YL112 alloy is already finished after solution......
2.09 ?m to 3.43 ?m, and the further refinement and spheroidization of the recrystallization grains are obtained. The grain size decreases from 12.6 μm to 8.80 μm and the respect ratio decreases from 1.61......
treatment is mainly composed of three stages of initial coarsening, structural separation and spheroidization. The subsequent coarsening of spheroidal grains is not observed. Key words: ZA84 magnesium alloy...-dendritic microstructure evolution of as-cast alloys generally experienced four stages during semi-solid isothermal heat treatment, that is, the initial coarsening, separation, spheroidization and final......
uniformly embedded. Y was not stable and was transformed into Y2O3 during laser cladding. The addition of Y could refine the microstructure of the coating by hastening the spheroidization of primary......
uniformly embedded. Y was not stable and was transformed into Y2O3 during laser cladding. The addition of Y could refine the microstructure of the coating by hastening the spheroidization of primary......
be obtained. The microstructural evolution during partial remelting can be divided into four stages: the initial rapid coarsening, structural separation, spheroidization and final coarsening, which... is the spheroidization of the polygonal particles through the melting of their edges and corners. Fig. 3 Variation of temperature in specimen with heating time Fig. 4 OM images of complex modified......
