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,2019,48(12):4046~4052.[Chen Xiaoya,Li Quanan,Li Zhitao,Wang Songbo,Zhang Shuai,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.]
Nd对Mg-13Gd-0.5Zr合金组织和力学性能的影响
投稿时间:2018-08-13  修订日期:2018-09-06
中文关键词:  Mg-13Gd-0.5Zr  Nd  显微组织  力学性能  细化机理
基金项目: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)
中文摘要:
      采用X射线衍射仪、光学显微镜、扫描电镜、能谱仪和电子拉伸试验机等设备研究了Nd对Mg-13Gd-0.5Zr合金组织和力学性能的影响,结合错配度理论、位错密度的变化规律讨论了合金晶粒细化的机理,并从细晶强化和析出强化等方面阐述了合金强化机制。研究发现Mg-13Gd-0.5Zr合金的组成相主要有α-Mg、Mg5Gd,Nd的加入在合金中形成了新相Mg41Nd5,并细化了合金晶粒。Nd的加入显著提高了Mg-13Gd-0.5Zr合金的室温和高温力学性能,当Nd的添加量为2%时,合金在室温和高温下的力学性能达到最大值279(室温)、319 MPa(250 ℃),合金力学性能的提高主要归因于Mg5Gd和Mg41Nd5相的析出强化和细晶强化的双重效果。Mg-13Gd-2Nd-0.5Zr合金在不同温度下的断裂方式主要以脆性断裂为主,随着拉伸温度的升高并由脆性断裂向韧性断裂转变。
Effect of Nd on Microstructure and Mechanical Properties of Mg-13Gd-0.5Zr Alloy
英文关键词:Mg-13Gd-0.5Zr  Nd  microstructure  mechanical properity  refinement mechanism
英文摘要:
      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.
作者单位E-mail
陈晓亚 西安理工大学 chenxiaoya2010@163.com 
李全安 西安理工大学  
李志涛 河南科技大学  
王颂博 河南科技大学  
张帅 河南科技大学  
关海昆 河南科技大学  
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