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陈晓亚,李全安,李志涛,王颂博,张帅,关海昆.Nd对Mg-13Gd-0.5Zr合金组织和力学性能的影响[J].稀有金属材料与工程(英文),2019,48(12):4046~4052.[Chen Xiaoya,Li Quanan,Li Zhitao,Wang Songbo,Zhang Shuai and Guan Haikun.Effect of Nd on Microstructure and Mechanical Properties of Mg-13Gd-0.5Zr Alloy[J].Rare Metal Materials and Engineering,2019,48(12):4046~4052.]
Effect of Nd on Microstructure and Mechanical Properties of Mg-13Gd-0.5Zr Alloy
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Received:August 13, 2018  Revised:September 06, 2018
DOI:
Key words: Mg-13Gd-0.5Zr  Nd  microstructure  mechanical properity  refinement mechanism
Foundation item:国家自然科学基金资助(51571084,51171059);河南省重点科技攻关计划资助项目(152102210072)
Author NameAffiliation
Chen Xiaoya,Li Quanan,Li Zhitao,Wang Songbo,Zhang Shuai and Guan Haikun  
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Abstract:
      The effects of Nd on the microstructure and mechanical properties of Mg-13Gd-0.5Zr alloy were studied by X-ray diffraction, optical microscope, scanning electron microscope, energy dispersive spectrometer and electronic tensile testing machine. The mechanism of grain refinement is discussed based on the mismatch theory and the change rule of dislocation density. The strengthening mechanism is also discussed from fine-grained strengthening and precipitation strengthening. It is found that the main constituent phases of Mg-13Gd-0.5Zr alloy are α-Mg and Mg5Gd. The addition of Nd forms a new phase Mg41Nd5 in the alloy and fines the grain of the alloy. The addition of Nd significantly improved the mechanical properties of Mg-13Gd-0.5Zr alloy at room temperature and high temperature. When the addition of Nd is 2%, the mechanical properties of the alloy reach the maximum values of 279 (room temperature) and 319 MPa (250 C) at room temperature and high temperature. The improvement of mechanical properties of the alloy is mainly attributed to the dual effects of precipitation strengthening and fine grain strengthening of Mg5Gd and Mg41Nd5 phases. Brittle fracture is the main fracture mode of Mg-13Gd-2Nd-0.5Zr alloy at different temperatures. As the stretching temperature increases, the alloy changes from brittle fracture to ductile fracture.