Improving mechanical properties of ZM61 magnesium alloy by aging before extrusion

Improving mechanical properties of ZM61 magnesium alloy by aging before extrusion
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挤压前时效提高ZM61镁合金力学性能

DOI:
10.1016/j.jallcom.2016.08.128
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发表时间:
2017-01
影响因子:
6.2
通讯作者:
Pan Fusheng
Pan Fusheng
中科院分区:
材料科学2区
文献类型:
--
作者:
Yu Daliang;Zhang Dingfei;Sun Jing;Luo Yuanxin;Xu Junyao;Zhang Hongju;Pan Fusheng

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研究了挤压前时效处理对Mg-6 Zn-1 Mn合金显微组织和力学性能的影响。结果表明,挤压前弥散分布的细小MgZn 2颗粒的存在促进了后续挤压过程中的动态再结晶,并导致了细小的组织(晶粒尺寸为1 ~ 2 μm)。时效态合金中的棒状和板状析出相经挤压后转变为细小弥散的球状析出相。ZM 61合金经时效和挤压处理后,抗拉强度和延伸率达到最佳平衡(YS 281 MPa,UTS 378 MPa,延伸率19.3%),压缩屈服强度从148 MPa提高到259 MPa。同时拉压屈服不对称性减小。本文证明了挤压前时效处理对ZM 61镁合金的强化作用,为设计相对廉价的高性能镁合金提供了一种新方法。
The effect of aging treatment before extrusion on microstructure and mechanical properties of Mg-6Zn-1Mn alloy was investigated. Results showed that the existence of dispersive fine MgZn2particles before extrusion promoted dynamic recrystallization in subsequent extrusion process and leaded to fine microstructures (grain size 1∼2 μm). The rod-shaped and plate-shaped precipitates in aged alloys transformed to fine and dispersed spherical precipitates after extrusion process. With aging and extrusion treatment, ZM61 alloy showed an outstanding tensile strength and elongation balance (YS 281 MPa, UTS 378 MPa and elongation 19.3%); compressive yield strength increased from 148 MPa to 259 MPa. The tension–compression yield asymmetry was reduced at the same time. The strengthening effect of aging treatment before extrusion in ZM61 alloy proved in this paper provided a new method for the design of relatively inexpensive high-performance magnesium alloys.
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