李甜甜,李丽华,顾永军,李谦,黄金亮

• 1:河南科技大学材料科学与工程学院
• 2:有色金属新材料与先进加工技术省部共建协同创新中心

摘要(Abstract)：

通过光学显微镜(OM)、X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)和显微硬度仪等研究了固溶时效处理对快速凝固Mg-9Li-4Al-1Zn-0.5Y(LAZ941-0.5Y)镁锂合金的组织和硬度的影响。结果表明:经固溶处理后,合金的显微组织粗化,第二相主要弥散分布在α-Mg相和β-Li相中及它们的相界处;XRD分析结果表明,与传统凝固相比,快速凝固态合金中的相种类没有发生显著变化,仍为α-Mg、β-Li、AlLi和Al_2Y相,但也出现了新的Mg_(24)Y_5物相和Mg_(17)Al_(12)相。合金薄带经固溶时效处理后,XRD显示合金物相的种类并没有发生显著变化,但经400℃固溶0.5 h后,部分AlLi和Mg_(17)Al_(12)相溶入基体;100℃时效0.25 h后,合金相呈弥散分布,且多数合金相的内部有纳米级颗粒物出现;这种内含纳米级颗粒物的合金相的沉淀强化作用使得合金薄带的显微硬度达到最大值,由快速凝固态的92.2 HV0.025增至108.1 HV0.025,提高了约17%。

关键词(KeyWords)： 镁锂合金;快速凝固;固溶处理;时效;显微硬度

Abstract:

Keywords:

基金项目(Foundation): 河南省重大科技攻关项目(1812002122800)

作者(Author): 李甜甜,李丽华,顾永军,李谦,黄金亮

DOI: 10.13289/j.issn.1009-6264.2021-0337

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