Effect Of Ag On Rolling Properties Of GW103K Alloy

Because of a series of advantages,such as low density,specific strength and specific stiffness,good shock absorption,excellent electromagnetic shielding and anti-radiation performance. Magnesium and magnesium alloy become the ideal lightweight material for the automotive industry, and become the current research hotspots. The automotive industry for magnesium alloys, especially high-strength magnesium alloy demand potential is enormous,research and development of high-performance magnesium alloy is the current research and development of magnesium alloy hot and difficult areas. RE magnesium alloys have great potential, the mechanical properties of RE magnesium alloys are very sensitive to the microstructure and texture of the materials, hot extrusion and hot rolling can refine the grains and crush coarse structure.So in this paper, rolling process, microstructural evolution and mechanical properties of GW103K (Mg-10Gd-3Y-0.5Zr) and GW103K+Ag (Mg-10Gd-3Y-0.5Zr-1Ag) alloys were investigated, in order to give an example for the coming industrialization of the RE magnesium alloy sheets in future.The rolling experiment of as-cast GW103K alloy shows that this alloy has good millability under the condition of deformation temperature larger than 250℃. The grain size is decreased with the down of rolling temperature, while increased with the decrease of rolling reduction.Throughing electric heated rollers to solve the problem of cracking in rolling process. Isothermal rolling were performed on as-cast GW103K and GW103K+Ag alloys, the results show that heated roller can improve continues millability and get the better surface quality.The rolling experiment of as-cast GW103K+Ag alloy shows that this alloy has good deformability at high temperature. The grain size is decreased with the down of rolling temperature, while increased with the decrease of rolling reduction. The faster the rolling speed, the higher the mechanical properties of GW103K+Ag alloy sheet.Participates of GW103K and GW103K+Ag alloys at peak-aged condition is β’,which acts as the important contributor to the high strength. The highest strength of GW103K at T5 condition shows ultimate tensile strength=462MPa, corresponding elongation=1.1%. And the highest strength of GW103K+Ag at T5 condition shows ultimate tensile strength=445MPa, corresponding elongation=1%. The peak aging time of GW103K+Ag is advance. The strengthening mechanism of RE magnesium alloy is work hardening, precipitation strengthening and fine grain strengthening.