|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Magnesium Technology 2017
||Development of High-strength High-speed-extrudable Mg-Al-Ca-Mn Alloy
||Taiki Nakata, Chao Xu, Taisuke Sasaki, Yasunobu Matsumoto, Kazunori Shimizu, Kazuhiro Hono, Shigeharu Kamado
|On-Site Speaker (Planned)
Poor hot-workability is one reason for the limited applications of wrought magnesium alloys. We have recently reported a precipitation hardenable Mg-Al-Ca-Mn dilute alloy with excellent extrudabilty. In this work, we optimized the composition of the Mg-Al-Ca-Mn alloy to achieve comparable strength and elongation to those of the 6000 series of Al alloys. We found that the Mg-1.3Al-0.3Ca-0.4Mn (wt.%) alloy extruded at high die-exit speed of 24 m/min shows excellent age-hardening response within only 0.5 h of aging at 200oC. The peak aged sample exhibited yield stress of 288 MPa and elongation of 21 % that are superior to those of 6000 series aluminum alloys. This high strength is attributed to the dispersion of Guinier Preston zones in relatively fine grains. If this excellent property is demonstrated in sheet materials, we can open up a possibility to development of “bake hardenable magnesium alloy”.