Microstructure Formation and Mechanical Properties in AZ31 Alloy Processed by Continuous Rheo-Extrusion
Based on continuous casting and extrusion (CAXTEX) process, a semisolid metal forming process, continuous rheo-extrusion of magnesium alloy, was proposed. Effect of casting temperature on semisolid region distribution, microstructure formation and stability of forming process, as well as microstructure and mechanical properties of the AZ31 alloy fabricated by the process were investigated. Microstructure evolution from dendrite to rosette or spherical grains was observed with the application of large shearing force provided by the roll. The results indicate that semisolid region in the roll-shoe gap moves downward gradually with the increase of casting temperature, and proper casting temperature range of 730～750℃ is suggested. Under the suggested casting temperature, 10×15mm sectional bar of AZ31 alloy with smooth surface and homogeneous striped microstructure has been obtained. As the product was aged for 14h at 180℃ after 16h solution at 415℃, the ultimate tensile strength and elongation could reach 305MPa and 11.5％, respectively.
Semisolid Casting Microstructure Mechanical properties Magnesium alloy
Renguo Guan Zhanyong Zhao Furong Cao Xiaoping Sun Qiusheng Zhang
P.O.Box 317, School of Materials & Metallurgy, Northeastern University, Shenyang 110004, China
国际会议
International Symposium on Advanced Rolling Equipment Technologies(第一届轧钢设备新技术国际研讨会 ISARET 2010)
太原
英文
353-360
2010-09-23（万方平台首次上网日期，不代表论文的发表时间）