摘要
向Mg-9Li合金中添加0.5%~2%(ω)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α-Mg相,铸态显微组织由α-Mg,β-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.
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.
出处
《过程工程学报》
EI
CAS
CSCD
北大核心
2006年第3期491-494,共4页
The Chinese Journal of Process Engineering
基金
国家高技术研究发展计划(863)资助项目(编号:2001AA335010)