Microstructural Evolution of Semi-Solid AZ61 Magnesium Alloy during Reheating Process

Abstract

The microstructural evolution of AZ61 semi-solid magnesium alloy during semi-solid remelting process was studied in this paper. The semi-solid billet was fabricated by strain-induced melt activation (SIMA) method. The results showed that the initial semi-solid grains melt mainly through coalescence. With the prolongation of isothermal holding time, the grains grew up and spheroidized, in which the mean diameter of grain and liquid volume fraction increased. In the meantime, the higher the holding temperature, the faster the grain grew and spheroidized. The suitable reheating temperature of AZ61 semi-solid magnesium alloy was 592. The samples were susceptible to serious deformation beyond 597.

Study on Thixo-Extrusion of Semi-Solid Wrought Magnesium Alloy

“…Where 5 A was constant; n was exponent; m was strain-rate sensitivity; s was exponent for the strain softening influence, negative; Q was activation energy; R was gas constant (8.31kJ/mol).…”

“…The three main procedures in semi-solid metal processing are blank-making [4], reheating [5] and thixoforming [6][7][8][9]. Thixo-forming is the last procedure, which benefits the quality of workpiece.…”

Study on Thixo-Forging of AZ61 Wrought Magnesium Alloy

“…The three main procedures in semi-solid metal processing are blank-making [4], reheating [5] and thixoforming [6]. Thixo-forming is the last procedure, which benefits the quality of workpiece.…”

Microstructural Evolution of SiCp/AZ61 Composites during Partial Remelting

“…With the growing development of semi-solid forming technology, the thixoforming technology of magnesium matrix composites is a new method. It was composed of three processes such as: semi-solid billet fabrication [3], partial remelting [4] and thixoforming [5]. The partial remelting has an important influence on thixoforming.…”