Sn对Mg-5Zn-2.5Al合金微观组织与性能的影响

doi:10.3976/j.issn.1002-4026.2022.01.008

山东科学 ›› 2022, Vol. 35 ›› Issue (1): 56-64.doi: 10.3976/j.issn.1002-4026.2022.01.008

Sn对Mg-5Zn-2.5Al合金微观组织与性能的影响

李冠宇^a(),李培亮^a,孙佳星^a,刘聪^a,张素卿^a^b,周吉学^a^b,赵东清^a^*(),庄海华^b

a.齐鲁工业大学(山东省科学院) 山东省科学院新材料研究所山东省轻质高强金属材料省级重点实验室,山东济南 250014
b.齐鲁工业大学(山东省科学院) 山东省科学院新材料研究所山东省汽车轻量化镁合金材料工程技术研究中心,山东济南 250014

收稿日期:2021-03-17 出版日期:2022-02-20 发布日期:2022-01-25
通信作者: 赵东清 E-mail:LGYguanyu@163.com;zhaodq@sdas.org
作者简介:李冠宇(1996—),男,硕士,研究方向为变形镁合金的组织与性能。E-mail: LGYguanyu@163.com
基金资助:
国家重点研发计划(2017YFB0103904);国家自然科学基金青年基金(51864190);山东省高等学校青创科技支持计划(2020KJA002)

Effects of Sn on the microstructures and properties of Mg-5Zn-2.5Al alloy

LI Guan-yu^a(),LI Pei-liang^a,SUN Jia-xing^a,LIU Cong^a,ZHANG Su-qing^a^b,ZHOU Ji-xue^a^b,ZHAO Dong-qing^a^*(),ZHUANG Hai-hua^b

a. Shandong Provincial Key Laboratory of High Strength Lightweight Metallic Materials, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
b. Shandong Engineering Research Center for Lightweight Automobiles Magnesium Alloy, Advanced Materials Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China

Received:2021-03-17 Online:2022-02-20 Published:2022-01-25
Contact: Dong-qing ZHAO E-mail:LGYguanyu@163.com;zhaodq@sdas.org

摘要/Abstract

摘要：

利用光学显微镜、扫描电镜、万能试验机等分析测试设备研究了Sn对Mg-5Zn-2.5Al-xSn(x=0,1,2,3,4)(ZAT52x)合金组织结构及力学性能的影响。采用Thermo-Calc热力学软件计算了ZAT52x(x=0,2,4)3种合金在Scheil模型条件下液相质量分数与温度的关系以及凝固过程中的相变反应。研究发现,ZAT52x合金铸态组织中存在α-Mg固溶体、Mg₂Sn(x=0时不析出)、φ-Mg₂₁(Zn,Al)₁₇、τ-Mg₃₂(Zn,Al)₄₉和MgZn相。随着Sn质量分数增加,合金熔点逐渐降低,第二相数量增多,铸态ZAT52x合金的拉伸强度和伸长率均呈先升高后降低趋势,ZAT522合金的性能最为优良,屈服强度、拉伸强度、伸长率分别为101.4 MPa、245.9 MPa、14.4%。挤压态ZAT52x合金屈服强度随Sn质量分数增加而增加,而拉伸强度、伸长率呈先升高后降低的趋势,其中,ZAT522合金拉伸强度和伸长率最高,分别为376.2 MPa和20.8%;ZAT524合金综合性能优良,拉伸强度和屈服强度达到363.7 MPa和260.4 MPa,伸长率为17.9%。

关键词: Mg-Zn-Al-Sn, 镁合金, 微观组织, 塑性变形, 力学性能

Abstract:

In this study,the effects of different Sn contents on the microstructures and mechanical properties of Mg-5Zn-2.5Al-xSn(x=0, 1, 2, 3, 4) (ZAT52x) alloys were investigated. Curves of the mass fraction of liquid versus temperature during solidification of Mg-5Zn-2.5Al-xSn (x=0, 2, 4) (ZAT52x) were calculated using the Thermo-Calc software. It is found that α-Mg, Mg₂Sn (not precipitated when x=0), φ-Mg₂₁(Zn,Al)₁₇, τ-Mg₃₂(Zn,Al)₄₉, and MgZn precipitate in sequence during the solidification of ZAT52x magnesium alloy. As the Sn addition increases, the melting point of the ZAT52x alloy decreases and the amount of the second phases increases, and the tensile strength and elongation of the as-cast ZAT52x increased at first and then decreased. The as-cast ZAT522 alloy exhibits the best mechanical properties with tensile strength of 245.9 MPa and elongation of 14.4%. After extrusion, the ZAT522 alloy exhibits the highest tensile strength (376.2 MPa) and elongation (20.8%), while the ZAT524 alloy shows a more balanced mechanical property with tensile strength, yield strength, and elongation of 363.7 MPa, 260.4 MPa, and 17.9%, respectively.

Key words: Mg-Zn-Al-Sn, magnesium alloy, microstructure, deformation, mechanical property

中图分类号:

TG146.2

李冠宇,李培亮,孙佳星,刘聪,张素卿,周吉学,赵东清,庄海华. Sn对Mg-5Zn-2.5Al合金微观组织与性能的影响[J]. 山东科学, 2022, 35(1): 56-64.

LI Guan-yu,LI Pei-liang,SUN Jia-xing,LIU Cong,ZHANG Su-qing,ZHOU Ji-xue,ZHAO Dong-qing,ZHUANG Hai-hua. Effects of Sn on the microstructures and properties of Mg-5Zn-2.5Al alloy[J]. Shandong Science, 2022, 35(1): 56-64.

图/表 9

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合金	w(Zn)/%	w(Al)/%	w(Sn)/%	w(Mg)/%
ZAT520	4.97	2.51	0	剩余
ZAT521	4.96	2.52	0.98	剩余
ZAT522	5.02	2.49	2.01	剩余
ZAT523	4.99	2.52	2.97	剩余
ZAT524	5.01	2.48	3.95	剩余

合金	铸态			固溶态
合金	屈服强度/MPa	拉伸强度/MPa	伸长率/%	屈服强度/MPa	拉伸强度/MPa	伸长率/%
ZAT520	88.1	210.5	10.4	78.6	216.9	12.6
ZAT521	98.1	215.5	11.6	90.6	244.6	15.3
ZAT522	101.4	245.9	14.4	100.5	268.5	16.2
ZAT523	95.1	220.9	10.5	106.6	269.8	11.6
ZAT524	100.9	205.1	10.0	104.3	272.5	9.8

合金	屈服强度/MPa	拉伸强度/MPa	伸长率/%
ZAT520	153.7	354.3	16.2
ZAT521	155.4	373.4	19.6
ZAT522	215.2	376.2	20.8
ZAT523	249.2	361.0	19.3
ZAT524	260.4	363.7	17.9

Sn对Mg-5Zn-2.5Al合金微观组织与性能的影响

Effects of Sn on the microstructures and properties of Mg-5Zn-2.5Al alloy

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