马一丹,李全安,陈晓亚,李卓琳

• 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
• 3:龙门实验室

摘要(Abstract)：

采用光学显微镜(OM)、扫描电镜(SEM)、X射线衍射(XRD)、能谱仪(EDS)和电子拉伸试验机等研究了添加不同的Er(0、1、3和5 mass%)含量对铸态Mg-8Gd-2Nd-0.5Zr合金组织与力学性能的影响。结果表明:Er元素的加入可以代替Gd原子的位置,形成Mg5(Gd, Er)相,细化合金的晶粒。除此之外,Er元素溶入基体中可以改变合金的晶格常数,使晶轴比c/a减小,影响合金的强度和塑性。当Er的添加量为3 mass%时,合金的晶粒尺寸最小,约为32μm,抗拉强度和伸长率最大,分别为230 MPa和8.1%,较未添加Er的合金分别提高了32.9%和88.3%。合金的室温拉伸断口随着Er含量的增加,解理面减少,撕裂棱变多,但总体仍表现为脆性断裂。

关键词(KeyWords)： Mg-8Gd-2Nd-0. 5Zr合金;Er;显微组织;力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(52371108,52201119);; 龙门实验室前沿探索课题(LMQYTSKT014)

作者(Author): 马一丹,李全安,陈晓亚,李卓琳

DOI: 10.13289/j.issn.1009-6264.2024-0069

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