Research Progress on Hot Tearing Behavior of Mg-Zn Series Alloys

doi:10.11900/0412.1961.2023.00393

Acta Metall Sin

2024, Vol. 60

Issue (6): 743-759 DOI: 10.11900/0412.1961.2023.00393

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Research Progress on Hot Tearing Behavior of Mg-Zn Series Alloys

WANG Feng¹^,²^,³(

), BAI Shengwei¹^,², WANG Zhi¹^,², DU Xudong¹^,²(

), ZHOU Le¹^,², MAO Pingli¹^,², WEI Ziqi¹^,², LI Jinwei³

1 School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
2 Key Laboratory of Magnesium Alloys and the Processing Technology of Liaoning Province, Shenyang University of Technology, Shenyang 110870, China
3 Liaoning Automobile Lightweight Technology Professional Innovation Center, Liaoning Dide Technology Co. Ltd., Tieling 112611, China

Cite this article:

WANG Feng, BAI Shengwei, WANG Zhi, DU Xudong, ZHOU Le, MAO Pingli, WEI Ziqi, LI Jinwei. Research Progress on Hot Tearing Behavior of Mg-Zn Series Alloys. Acta Metall Sin, 2024, 60(6): 743-759.

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Abstract

Mg-Zn series alloys, an important alloy system among magnesium alloys, have garnered considerable attention due to their rich phase composition, outstanding deformability, and aging strengthening effects. These alloys demonstrate great potential for applications in the aerospace, automotive, and biomedical industries. However, the wide solidification temperature range and large shrinkage of these alloys render them largely susceptible to hot tearing, limiting their applications to a certain extent. Thus, investigating the hot tearing behavior of Mg-Zn series alloys is important. In this paper, a comprehensive summary of theories pertaining to hot tearing, the effects of alloying elements and casting process parameters on the susceptibility of Mg-Zn series alloys to hot tearing, and the current status of research on the numerical simulation of this phenomenon are presented. Furthermore, this article discusses the influence of microstructure and solidification parameters of Mg-Zn series alloys on their hot tearing susceptibility and proposes limitations and suggestions for the current research on the hot tearing behavior of magnesium alloys to guide the design and application of Mg-Zn series alloys.

Key words: Mg-Zn series alloys hot tearing susceptibility microstructure processing parameter

Received: 19 September 2023

ZTFLH:

TG146.2

Fund: Basic Scientific Research Project of Liaoning Provincial Department of Education (Key Research Project)(JYTZD2023108);High Level Innovation Team of Liaoning Province(XLYC-1908006);Liaoning Nature Fund Guidance Plan(2022-BS-179);General Project of Liaoning Provincial Department of Education(LJKMZ20220462)

Corresponding Authors: WANG Feng, professor, Tel: 15002424621, E-mail: wf9709@126.com;
DU Xudong, Tel: 13940206929, E-mail: dxd9297@126.com

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	MAO Pingli
	WEI Ziqi
	LI Jinwei

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https://www.ams.org.cn/EN/10.11900/0412.1961.2023.00393 OR https://www.ams.org.cn/EN/Y2024/V60/I6/743

Fig.1 Important parameters and stages in the solidification process of alloys^[10] (T_L—liquidus temperature; T—current temperature of the melt, T_0.4, T_0.9, T_0.99—the corresponding temperatures when the solid fraction is 40%, 90%, and 99%, repectively; T_S—solidus temperature)

Table 1 Maximum solid solution of common alloying elements in magnesium^[26-36]

Table 2 Hot tearing susceptibility (HTS) results of Mg-Zn-Y series alloys^[37-47]

Table 3 HTS results of Mg-Zn-Cu series alloys^[66,67]

Table 4 HTS results of Mg-Zn-Ca series alloys^[61,70-72]

Table 5 Secondary phases in Mg-Zn-X-Y(-Z) alloy after the addition of alloying elements and the most effective secondary phase reducing the hot tearing susceptibility of alloys^{[79-81,83,85-87]}

Fig.2 Schematic of “T”-shaped hot tearing test system with magnetic field^[96]

Fig.3 SEM images of hot tears (a-c) and microstructure morphologies (d, e)^[95], and schematics of feeding (f, g)^[96] in Mg-4Zn-1.5Ca alloy under natural solidification (a, d, f) and low-frequency alternating magnetic fields (LAMF) (b, c, e, g)

Fig.4 Schematics of the MgZnCu phase agglomeration and spheroidization under LAMF (a-d, f) and SEM images of MgZnCu phase (e, g, h)^[94]

Fig.5 Macroscopic photos of hot tearing and results of numerical simulation for Mg-1Zn-xY alloy^[42] (a-f) and Mg-xZn-2Y alloys^[46] (g-n)

Table 6 Mechanism of the secondary phase species on hot tearing behavior of magnesium alloys

Fig.6 Solidification temperature range and hot tearing susceptibility of several different alloys
(a) Mg-4Zn-1.5Ca alloy under different strengthes of LAMF^[95]
(b) Mg-5(Zn + Y)-0.5Zr alloys (CSC—crack sus-ceptibility coefficient; A: Mg-2.5Zn-2.5Y-0.5Zr alloy, B: Mg-3Zn-2Y-0.5Zr alloy, C: Mg-3.75Zn-1.25Y-0.5Zr alloy, D: Mg-4.29Zn-0.71Y-0.5Zr alloy)^[44]
(c) Mg-xZn-4Y-0.5Zr alloy^[47]

Fig.7 Effects of Y^[43], Al^[76], and Ca^[72] elements on the solidification temperature interval and HTS of Mg-Zn binary alloy (T_max, T_min—the largest and the lowest solidification temperature ranges in the investigated alloys, respectively)

Fig.8 Schematics of alloy solidification process (f_s—solid fraction, $f s c o h$ —solid fraction when dendrite coherency, $T c o h$ —temperature when dendrite coherency)
(a) the condition of f_s is low when dendrite coherency
(b) the condition of f_s is high when dendrite coherency

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