Study On AZ61 Magnesium Alloy Fabricated By SIMA And Reheating Process

Semi-solid metal forming technology has been developed rapidly since the 1970s, it is regarded as the foreland metal process technology in 21 century. And many of the study reports were used to focus on Al alloy. In present time, with the further development of the research of semi-solid metal process technology, SSF technology has obtained rapidly development and widely application. It has been applied to magnesium alloy.In recent years, the classical method of producing semi-solid ingot are mechanical stirring, electro-magnetic stirring, strain-induced melt activation (SEVIA) and so on .The fabrication of material with SIMIA processing is not above the liquidus. There are easier technology and less expenses of equipment than the others.Therefore, more and more people care about it now. In the paper semi-solid AZ61 ingot was produced by using the method of strain-induced melt activation (SEVIA), and then the ideal, thin and mean semi-solid microstructure were obtained through the strain-induced melt activation method, and the influences of predeformation, the temperature of the isothermal heat-treatment and the holding time on the non-dendritic microstructure were analyzed.In the meantime, reheating experiments were more studied on semi-solid AZ61 magnesium alloy. The evolution of the microstructures during partial re-melting was described and analyzed. The results showed that, the suitable temperature range of AZ61 semi-solid magnesium alloy reheating was near 587℃~592℃. The samples were susceptible to serious deformation above 595°C. The research is instructional significance to thixoforming of AZ61 semi-solid magnesium alloy.A finite element calculation in ABAQUS software has been performed to simulate the upset and extrusion test of AZ61 magnesium alloy. The equivalent strainfield and the equivalent stress field were obtained.Contrasted the upset and extrusion experiment and the simulation result, and found that they fitted well. So the technological parameters have special reference to practical application of AZ61 magnesium alloy.