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

Abstract

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

CLC Number:

TG146.2

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.

Figures/Tables 9

Table 1

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References 27

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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

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

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