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›› 2006, Vol. 6 ›› Issue (3): 491-494.

• 材料工程专栏 • 上一篇    下一篇

新型Mg-Li-Mn合金的显微组织和力学性能

李红斌,吉海宾,姚广春,刘宜汉,郭志强,刘振刚   

  1. 东北大学材料与冶金学院
  • 出版日期:2006-06-20 发布日期:2006-06-20

Microstructure and Mechanical Properties of Mg-Li-Mn Alloy

LI Hong-bin,JI Hai-bin,YAO Guang-chun,LIU Yi-han,GUO Zhi-qiang,LIU Zhen-gang   

  1. School of Materials and metallurgy, Northeastern University
  • Online:2006-06-20 Published:2006-06-20

摘要: 向Mg-9Li合金中添加0.5%~2%(w)Mn,并在室温下对合金板材进行拉伸测试. 结果表明,Mn能够细化a-Mg相,铸态显微组织由a-Mg, b-Li相及富Mn新相组成,合金板材具有较高的强度和良好的延伸率;随着Mn含量的增加,强度不断提高,延伸率有所下降. 通过金相观察、SEM和XRD分析可知,随着Mn含量的增加,其存在形式由固溶状态转变为以富Mn新相为主,对合金起到了强化作用,进而能够提高强度.

关键词: Mg-Li-Mn合金, 冷轧, 显微组织, 力学性能

Abstract: Mg-Li-Mn alloy is produced and rolled to thin sheet at room temperature in the present work. Adding Mn from 0.5% to 2% to the alloy can refine the crystalline grains. The resulting microstructure of alloy consists of α-Mg, β-Li and new Mn-rich phase. Uniaxial tension tests are carried out at room temperature. The prepared sheets have good tensile strengthen and yield strength. They can be raised by 16% and 17%, respectively, with Mn content increasing from 1% to 2%. It is observed that the existence of Mn on the grain boundary makes the grains refined, and hard particles of MgMn2O4 and Li0.5MnO2 forming in the alloy improves its mechanical properties.

Key words: Mg-Li-Mn alloy, cold-rolling, microstructure, mechanical properties