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热处理对挤压态Mg-9Sn-1.5Y-0.4Zr镁合金显微组织与力学性能的影响
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太原科技大学,太原科技大学,太原科技大学,太原科技大学

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山西省科技攻关项目(20140321014-04)太原科技大学博士启动基金(20122011)


Effects of heat treatment on microstructure and mechanical properties of as-extruded Mg-9Sn-1.5Y-0.4Zr magnesium alloy
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Taiyuan University of Science and Technology,Taiyuan University of Science and Technology,Taiyuan University of Science and Technology,Taiyuan University of Science and Technology

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    摘要:

    本文对热处理对挤压态Mg-9Sn-1.5Y-0.4Zr镁合金显微组织与力学性能的影响进行了实验性探究。结果显示热处理对挤压态Mg-9Sn-1.5Y-0.4Zr镁合金显微组织与力学性能具有显著影响。挤压态合金主要由非均匀分布的Mg2Sn相组成。经过495℃,10h固溶处理之后,大部分Mg2Sn相溶入到基体中。时效处理能大幅改善Mg-9Sn-1.5Y-0.4Zr合金的力学性能,最佳时效工艺为:在250℃条件下时效60h。实验最终力学性能参数为:维氏硬度89HV,极限抗拉强度262MPa,屈服强度218MPa,延伸率10.4%。基于实验结果分析,可以发现对于经时效处理的挤压态Mg-9Sn-1.5Y-0.4Zr合金,沉淀强化是主要的强化因素(~51.76%)。

    Abstract:

    The effects of heat treatment on microstructure and mechanical properties of the as-extruded Mg-9Sn-1.5Y-0.4Zr (wt%) alloy were investigated experimentally in this study. The results showed that the heat treatment plays an important role on the microstructure and mechanical properties of the as-extruded Mg-9Sn-1.5Y-0.4Zr alloy. The as-extruded alloy is mainly composed of non-uniform Mg2Sn phase. After the solution treated at 495℃for 10h, a majority of the Mg2Sn phases in the alloy were dissolved into the matrix. Aging treatment can highly improve the mechanical properties of the Mg-9Sn-1.5Y-0.4Zr alloy with the optimized experimental condition of aging at 250℃for 60h after solution treated at 495℃for 10h. The corresponding mechanical property parameters are: hardness of 89HV, ultimate tensile strength of 262MPa, yield strength of 218MPa, elongation of 10.4%. Based on the experimental results analysis, it is found that the precipitation strengthening is the main contributor (~51.76%) to the total yield strength in the aged experimental alloy.

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张代东,郝晓伟,房大庆,柴跃生.热处理对挤压态Mg-9Sn-1.5Y-0.4Zr镁合金显微组织与力学性能的影响[J].稀有金属材料与工程,2016,45(9):2208~2213.[zhangdaidong, haoxiaowei, fangdaqing, chaiyuesheng. Effects of heat treatment on microstructure and mechanical properties of as-extruded Mg-9Sn-1.5Y-0.4Zr magnesium alloy[J]. Rare Metal Materials and Engineering,2016,45(9):2208~2213.]
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  • 收稿日期:2014-06-24
  • 最后修改日期:2014-10-21
  • 录用日期:2014-11-20
  • 在线发布日期: 2016-10-09
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