<strong>Mg-8Zn-4Al-0.5Cu-0.5Mn-<i>x</i>Li</strong>高模量铸造镁合金的组织和性能

doi:10.11901/1005.3093.2023.130

材料研究学报

2024, Vol. 38

Issue (3): 187-196 DOI: 10.11901/1005.3093.2023.130

研究论文

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Mg-8Zn-4Al-0.5Cu-0.5Mn-xLi高模量铸造镁合金的组织和性能

刘晨野¹^,², 罗天骄¹(

), 李应举¹, 冯小辉¹, 黄秋燕¹, 郑策¹, 朱成¹, 杨院生¹

^1.中国科学院金属研究所沈阳 110016
^2.中国科学技术大学材料科学与工程学院沈阳 110016

Microstructure and Properties of As-cast Mg-8Zn-4Al-0.5Cu-0.5Mn-xLi Alloys with High Modulus

LIU Chenye¹^,², LUO Tianjiao¹(

), LI Yingju¹, FENG Xiaohui¹, HUANG Qiuyan¹, ZHENG Ce¹, ZHU Cheng¹, YANG Yuansheng¹

^1.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^2.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

引用本文:

刘晨野, 罗天骄, 李应举, 冯小辉, 黄秋燕, 郑策, 朱成, 杨院生. Mg-8Zn-4Al-0.5Cu-0.5Mn-xLi高模量铸造镁合金的组织和性能[J]. 材料研究学报, 2024, 38(3): 187-196.
Chenye LIU, Tianjiao LUO, Yingju LI, Xiaohui FENG, Qiuyan HUANG, Ce ZHENG, Cheng ZHU, Yuansheng YANG. Microstructure and Properties of As-cast Mg-8Zn-4Al-0.5Cu-0.5Mn-xLi Alloys with High Modulus[J]. Chinese Journal of Materials Research, 2024, 38(3): 187-196.

全文: PDF(30285 KB) HTML

摘要:

设计和制备Mg-8Zn-4Al-0.5Cu-0.5Mn-xLi (x = 0，3，5，7)(%，质量分数)系列高比模量的镁合金，研究了它的组织和性能。Li含量为3.14%和5.37%的两种镁合金，其基体为单相α-Mg，在晶界析出骨骼状Mg₃₂(Al, Zn)₄₉相，在晶粒内有颗粒状Mg₅Al₂Zn₂相和Al₂Mn相；Li含量为7.57%的合金，其基体主要为双相组织α-Mg + β-Li。添加Li元素后在晶界附近生成的共晶组织由α-Mg相和层片状AlLi相组成，并随着Li含量的提高层片状AlLi相的含量随之提高。随着Li含量的提高，合金的屈服强度呈逐渐提高的趋势，而抗拉强度基本上不变，合金的弹性模量呈现先提高后降低的趋势。铸态合金ZA84-5Li的弹性模量可达51.89 GPa，比纯Mg的弹性模量高7 GPa，但是其力学性能基本不变，屈服强度为141 MPa，抗拉强度为189 MPa，密度为1.71 g/cm³。

关键词 ：金属材料, 镁合金, 第二相强化, 显微组织, 弹性模量

Abstract：

Aiming at the demand of high stiffness light metal structure materials, high specific modulus Mg-alloys Mg-8Zn-4Al-0.5Cu-0.5Mn-xLi (x = 0, 3, 5, 7) (%, mass fraction) (namely ZA84-xLi) were designed and prepared, as well as and then optimized. When the Li content in the alloy is 3.14% and 5.37%, the alloy matrix is composed mainly of single-phase α-Mg, while the skeletal-like Mg₃₂(Al, Zn)₄₉ phase is precipitated near grain boundaries, and there is a granular-like Mg₅Al₂Zn₂ phase and Al₂Mn phase inside the grain; when the Li content is 7.57%, the alloy matrix is mainly a dual-phase structure α-Mg + β-Li. After the addition of Li, many eutectic structures are formed near the grain boundaries, which are composed of α-Mg phase and lamellar-like AlLi phase, and with the increase of Li content, the amount of lamellar-like AlLi phase also gradually increases. The yield strength of the alloy increases gradually with the increase of Li content, while the tensile strength remains basically unchanged. The elastic modulus of the alloy increases first and then decreases with the increase of Li content. For the as-cast ZA84-5Li, the elastic modulus can reach 51.89 GPa, which is 7 GPa higher than that of pure Mg, while the mechanical properties of the alloy basically keeps unchanged. Namely, the yield strength, tensile strength and density is 141 MPa, 189 MPa and 1.71 g/cm³ respectively for the cast alloy.

Key words： metallic materials magnesium alloy second phases reinforcement microstructure elastic modulus

收稿日期: 2023-02-15

ZTFLH:

TG146.22

基金资助:国家重点研发计划(2021YFB3701100)

通讯作者: 罗天骄，副研究员，tjluo@imr.ac.cn，研究方向为新型金属材料制备及其性能

Corresponding author: LUO Tianjiao, Tel:(024)23971109,13514252330, E-mail: tjluo@imr.ac.cn

作者简介: 刘晨野，男，1995年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2023.130 或 https://www.cjmr.org/CN/Y2024/V38/I3/187

表1 ZA84-xLi合金的化学成分

图1 ZA84-xLi合金的XRD谱

图2 ZA84-xLi合金金相组织

图3 ZA84-xLi合金的平均晶粒尺寸

图4 ZA84-xLi合金扫描照片

图5 ZA84-xLi合金中第二相的含量

图6 ZA84-5Li合金的能谱分析

图7 ZA84-5Li合金的二次离子质谱

图8 ZA84-3Li合金透射分析

图9 ZA84-xLi合金的密度

图10 ZA84-xLi合金的硬度

图11 ZA84-xLi合金的拉伸性能

图12 ZA84-xLi合金的拉伸断口纵剖面金相照片

图13 ZA84-xLi合金的拉伸断口形貌照片

图14 ZA84-xLi合金的弹性模量

表2 ZA84-xLi合金中的基体和晶界第二相弹性模量

图15 ZA84-xLi合金的纳米压痕分析

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