High strength and excellent ductility of dilute Mg-0.68Al-0.32Ca-0.50Mn (wt%) extrusion alloy obtained by T6 treatment
High strength and excellent ductility of dilute Mg-0.68Al-0.32Ca-0.50Mn (wt%) extrusion alloy obtained by T6 treatment
复制标题
高%20强度%20和%20优秀%20延展性%20的%20稀%20Mg-0.68Al-0.32Ca-0.50Mn%20(wt%)%20挤压%20合金%20获得%20经%20T6%20处理
DOI：
10.1016/j.matchar.2020.110197
复制
发表时间：
2020-04-01
影响因子：
4.7
通讯作者：
Zheng, Mingyi
中科院分区：
文献类型：
--
作者：
Liu, Xiaoqing;Qiao, Xiaoguang;Zheng, Mingyi
采用挤压和T6热处理工艺，制备了一种高强度、高塑性的稀相Mg-0.68Al-0.32Ca-0.50Mn（AXM 070305，wt%）镁合金。在T6峰时效处理后，该合金表现出248 MPa的屈服强度（YS）、288 MPa的极限拉伸强度（UTS）和21.0%的断裂伸长率（EL）。高强度主要归因于存在高数量密度的纳米尺寸的β-Mn沉淀物、大量的单层Guinier-Preston（G. P.）区和平面Al 2Ca相。良好的塑性主要是由于再结晶充分的细小晶粒和弱的基面织构。该合金在200 ℃时效16 h后的峰值显微硬度达到67.9 HV，这是由于单层G. P.区、纳米颗粒β-Mn相和平面Al 2Ca相的析出所致。
A dilute Mg-0.68Al-0.32Ca-0.50Mn (AXM070305, wt%) magnesium (Mg) alloy with high strength and excellent ductility was developed by extrusion and subsequent T6 heat treatment. The alloy exhibits a yield strength (YS) of 248 MPa, ultimate tensile strength (UTS) of 288 MPa and elongation to failure (EL) of 21.0%, after T6 peak-aged treatment. The high strength is mainly attributed to the presence of high number density of nanosized beta-Mn precipitates, a large number of mono-layered Guinier-Preston (G.P.) zones and planar Al2Ca phase. The excellent ductility is mainly due to the fully recrystallized fine grains with weak basal texture. The peak microhardness of this alloy was reached 67.9 HV after aging at 200 degrees C for 16 h, due to the precipitation of mono-layered G.P. zone, nanosized particle beta-Mn phase and planar Al2Ca phase.