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朱利敏,李全安,周耀,严景龙.Sm对Mg-10Gd-0.5Zr合金组织及力学性能的影响[J].稀有金属材料与工程(英文),2019,48(1):171~176.[Zhu Li-min,Li Quan-an,Zhou Yao and Yan Jing-long.Effect of Sm on microstructures and mechanical properties of Mg-10Gd-0.5Zr alloy[J].Rare Metal Materials and Engineering,2019,48(1):171~176.]
Effect of Sm on microstructures and mechanical properties of Mg-10Gd-0.5Zr alloy
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Received:May 23, 2017  Revised:September 19, 2017
DOI:
Key words: Sm  Mg-Gd-Zr alloy  microstructures  solution-aging  tensile strength
Foundation item:国家自然科学(51171059,51571084),河南省重点科技攻关项目(152102210072)。
Author NameAffiliation
Zhu Li-min,Li Quan-an,Zhou Yao and Yan Jing-long  
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Abstract:
      Mg-10Gd-0.5Zr alloys with 1-5wt% Sm addition were prepared by melting and casting method. The effect of Sm on microstructures and mechanical properties were investigated by tensile tests, SEM and XRD. The results show that the Mg41Sm5 phase is found because of Sm addition, Sm promotes the precipitation of Mg5Gd. After solution-aging treatment, the coarsening eutectic structures at grain boundary were dissolved and the precipitation dispersed homogeneous. The finer grain size is observed when content of Sm come to 3wt%. Some of Mg5Gd phase become short rod-like when Sm addition is 5wt%. Under the same experimental temperature, the strength of tested alloys increases at fist and then decrease, and peak strength present when content of Sm is 3wt%. For the same alloy, with increasing of test temperature, the strength increase at fist and then decrease too. When Sm content is 0~1wt%, the temperature of tensile strength peak is 200℃ and the temperature is 250℃ when Sm content is 3~5wt%. There are abnormal temperature effects in tensile tests, the effect is reinforced and the temperature of tensile strength peak rise with the Sm addition.