摘要
分析钆在AZ91合金中的形貌、相组成、组织成分对力学性能和耐腐蚀性能的影响。结果表明,钆的含量为1%~3%时,合金晶粒尺寸随着钆含量的增加而减小,且由树枝晶向等轴晶转变;当钆含量超过3%时,晶粒尺寸随钆含量增加开始逐步增大,且晶内缺陷增加;在钆含量达到5%时,合金中再次出现枝晶组织。当合金中钆含量为3%时,力学性能最好,其室温抗拉强度为261.6 MPa,延伸率为4.6%,分别比不添加钆的合金提高了34.6%和70.4%;200℃的抗拉强度为148.7 MPa,延伸率为4.1%,分别比不添加钆的合金提高了47.8%和32.3%。随着钆含量的增加,合金的腐蚀电流密度大幅度降低,自腐蚀电位略有增加。
Effects of microstructure,phase composition,composition of scandium in AZ91 alloy on alloy＇s mechanical and corrosion properties were investigated.The results show that grain size of Mg-Gd alloy drops with increase of gadolinium content,and crystal morphology transforms from dendrite to isometric crystal with gadolinium content of about 1% ~3%.Correspondingly,grain size rises with increase of gadolinium content and crystal defects increases with gadolinium content of 3% above.Dendrite crystal is observed again when gadolinium content is up to 5%.The optimum mechanical properties at room temperature and 200 ℃ are improved to 261.6 MPa and 148.7 MPa respectively when gadolinium content is increased to 3%.Corrosion current density drops markedly opon adding gadolinium,while sel-corrosion potential rises slightly.
出处
《有色金属（冶炼部分）》
CAS
北大核心
2017年第2期55-58,共4页
Nonferrous Metals（Extractive Metallurgy)
基金
广西高校科研项目(KY2015LX170)
关键词
AZ91
钆
微观组织
力学性能
腐蚀性能
AZ91
gadolinium
microstructure
mechanical property
corrosion property
