On the improved tensile strength and ductility of Mg--Sn--Zn--Mn alloy processed by aging prior to extrusion
On the improved tensile strength and ductility of Mg--Sn--Zn--Mn alloy processed by aging prior to extrusion
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DOI：
10.1016/j.jma.2019.07.007
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发表时间：
2019-12
影响因子：
17.6
通讯作者：
L. Zhong;Yongjian Wang;Dou Yuchen
中科院分区：
文献类型：
--
作者：
L. Zhong;Yongjian Wang;Dou Yuchen
研究了挤压前时效（APE）对挤压态Mg-8.32Sn-1.85Zn-0.17Mn合金拉伸强度和塑性的影响。结果表明，APE处理显著增加了再结晶晶粒的体积分数，从而降低了挤压态合金的晶粒尺寸。这一现象主要归因于APE处理和动态沉淀过程中产生的大量细小Mg 2Sn沉淀物所引起的颗粒激发形核和钉扎效应。拉伸屈服强度从242.4MPa提高到256.5MPa。合金抗拉强度的提高主要是由于晶界强化和沉淀强化的增强。挤压态合金的塑性也显著提高，从7.1%提高到13.5%。APE合金塑性的提高是由于织构的随机化、<c+a>滑移的活跃性以及{10-11}收缩孪晶和粗大Mg 2Sn相的抑制。
This study investigated the influence of aging prior to extrusion (APE) on the tensile strength and ductility of as-extruded Mg–8.32Sn–1.85Zn–0.17Mn alloy. Results demonstrated that APE treatment dramatically increased the volume fraction of recrystallized grains, thereby decreasing the grain size of the as-extruded alloy. This phenomenon was primarily attributed to the particle-stimulated nucleation and pinning effect induced by large amounts of small Mg2Sn precipitates produced by the APE treatment and dynamic precipitation. The tensile yield strength increased from 242.4 MPa to 256.5 MPa after APE treatment. The improved tensile strength can be attributed to the enhanced grain boundary strengthening and precipitation strengthening. The ductility of the as-extruded alloy also markedly increased from 7.1% to 13.5% after the APE treatment. The improved ductility of APE alloy was attributed to the texture randomization, the activity of pyramidal <c+a> slip and the suppressed formation of {10-11} contraction twins and coarse Mg2Sn phases.