等通道挤压制备医用超细晶Mg-3Sn-0.5Mn合金及其力学性能
发布时间：2019-01-04 18:35
【摘要】：采用等通道转角挤压(equal channel angular pressing,ECAP)方法成功挤压了Mg-3Sn-0.5Mn合金,采用OM和TEM观察了ECAP过程中合金微观组织和晶粒尺寸的变化,测试了ECAP后Mg-3Sn-0.5Mn合金的力学性能与腐蚀性能,通过XRD观察了ECAP变形后的织构取向变化。结果显示,ECAP后得到了超细晶Mg-3Sn-0.5Mn合金组织,在320℃下经过4道次挤压后平均晶粒尺寸细化到了1.65 mm,局部晶粒细化到了0.80 mm,晶粒细化是剧烈塑性变形与再结晶共同作用的结果。4道次变形后,延伸率从22.2%上升到58.6%,抗拉强度从242.8 MPa下降到195.6 MPa,延伸率提高了约3倍,强度略有下降。ECAP后的Mg-3Sn-0.5Mn合金织构择优取向发生了显著改变,这种变化有利于滑移系的开动,提高了材料的塑性,但对强度有一定的不利影响。ECAP后的Mg-3Sn-0.5Mn合金力学性能受到改变的织构择优取向和细晶强化的共同影响。
[Abstract]:The Mg-3Sn-0.5Mn alloy was extruded successfully by equal channel angular extrusion (equal channel angular pressing,ECAP) method. The changes of microstructure and grain size of the alloy during the ECAP process were observed by OM and TEM. The mechanical and corrosion properties of Mg-3Sn-0.5Mn alloy after ECAP were tested. The texture orientation of ECAP was observed by XRD. The results showed that the microstructure of ultrafine grained Mg-3Sn-0.5Mn alloy was obtained after ECAP, and the average grain size was refined to 1. 65 mm, local grain size to 0. 80 mm, after 4 passes extrusion at 320 鈩，
本文编号：2400644
[Abstract]:The Mg-3Sn-0.5Mn alloy was extruded successfully by equal channel angular extrusion (equal channel angular pressing,ECAP) method. The changes of microstructure and grain size of the alloy during the ECAP process were observed by OM and TEM. The mechanical and corrosion properties of Mg-3Sn-0.5Mn alloy after ECAP were tested. The texture orientation of ECAP was observed by XRD. The results showed that the microstructure of ultrafine grained Mg-3Sn-0.5Mn alloy was obtained after ECAP, and the average grain size was refined to 1. 65 mm, local grain size to 0. 80 mm, after 4 passes extrusion at 320 鈩，
本文编号：2400644
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