Li含量对Mg-6Y-3Zn-xLi合金微观组织和力学性能的影响
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航天材料及工艺研究所,北京 100076

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TG146.22

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Effects of Li Content on The Microstructure and Mechanical Properties of Mg-6Y-3Zn-xLi Alloys
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Aerospace Research Institute of Materials & Processing Technology,Beijing 100076

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    摘要:

    采用氩气保护真空熔炼的方法制备了铸态Mg-6Y-3Zn-xLi(x=0,5,8,11,wt%)合金,并对其进行了均匀化处理和热挤压变形。通过OM、SEM以及拉伸试验等手段研究了Li含量对合金微观组织与力学性能的影响。结果表明:随着Li含量的增加,铸态Mg-6Y-3Zn-xLi合金基体由α单相结构逐渐转变为(α+β)双相结构,晶粒尺寸和共晶化合物的形貌及分布规律也发生明显变化。均匀化处理后Mg-6Y-3Zn-xLi合金中形成的块状长周期有序(LPSO)结构相,随Li含量的增加其体积分数逐渐降低,(Mg,Zn)24Y5相数量则逐渐增多。Mg-6Y-3Zn-8Li合金进过均匀化处理和热挤压变形后表现出最优的综合力学性能,抗拉强度和延伸率分别达到278 MPa和11.6%,这主要是由于均匀分布的被破碎细化的块状LPSO相和大量细小动态再结晶的共同强化作用。

    Abstract:

    The as-cast Mg-6Y-3Zn-xLi (x=0,5,8 and 11wt%) alloys were prepared by vacuum induction melting under controlled argon atmosphere.The alloys were then processed by homogenized treatment and hot extrusion. The effects of Li content on the microstructure and mechanical properties of the alloys were investigated by using OM, SEM and tensile test. The results showed that, with increasing Li content, the as-cast Mg-6Y-3Zn-xLi alloys were transformed gradually from single α phase structure to (α+β) dual-phase structure. Meanwhile, the grain size of Mg matrix, morphology and distribution of eutectic compounds were changed remarkably. After homogenized treatment, block-like long-period stack ordered (LPSO) phases formed in the Mg-6Y-3Zn-xLi alloys. As Li content increased, the volume fraction of LPSO phases decreased, while the amount of (Mg,Zn)24Y5 phases increased. Tensile test results indicated that as-extruded Mg-6Y-3Zn-8Li alloy exhibitsed the best comprehensive mechanical properties,i.e.,the ultimate tensile strength and elongation reached to 278 MPa and 11.6%, respectively.The improvement of mechanical properties was mainly attributed to the complex strengthening mechanism by the distributed fragmented and refined LPSO phases and the great amount of fine dynamic recrystallized grains.

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杜玥,黄啸辰,张景琪,张亚莲,丁俊峰. Li含量对Mg-6Y-3Zn-xLi合金微观组织和力学性能的影响[J].宇航材料工艺,2021,51(6):37-43.

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  • 收稿日期:2021-05-20
  • 最后修改日期:2021-07-05
  • 录用日期:2021-07-06
  • 在线发布日期: 2022-01-13
  • 出版日期:
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