摘要
利用光学显微镜、X射线衍射仪、扫描电子显微镜、万能力学试验机等手段,系统研究了稀土Nd的含量对Mg-6Zn-Mn镁合金的显微结构和力学性能的影响。结果表明,稀土Nd对铸态Mg-6Zn-Mn镁合金具有明显的细化枝晶作用。经过360℃挤压后,合金显微组织发生明显变化。当Nd含量较低时(低于0.4%,质量分数),合金的动态再结晶率较低,合金的室温综合力学性能最好,与初始合金相比,其屈服强度提高了17%,达到250MPa,抗拉强度超过300MPa。然而,随着Nd含量的进一步增加,合金的动态再结晶率升高,发生完全动态再结晶,在其晶界上析出粗大的T相,而导致合金综合力学性能下降。
The microstructure and mechanical properties of as-extruded Mg-6Zn-Mn magnesium alloy with different Nd content were investigated by OM, XRD and tensile testing, respectively. It was found that the dendrite arm spacing of as-cast Mg-6Zn-Mn magnesium alloys was effectively decreased with Nd addition. Furthermore, the microstructure of Mg-6Zn-Mn magnesium alloys changed signifi- cantly after hot extrusion at 360℃ with Nd doped under extrusion ratios of 25. The Mg-6Zn-Mn mag- nesium alloy with 0.2% Nd shows the highest yield strength (about 250 MPa) and ultimate strength (above 300MPa) by tensile tests at room temperature.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2013年第3期1-5,共5页
Journal of Materials Engineering
基金
国家973重大基础研究项目(2013CB632200)
国家十二五科技支撑计划项目(2011BAE22B01-3)
中央高校基本科研业务费(CDJXS11132228)