Transactions of Materials and Heat Treatment

Title：Effect of preheating temperature on microstructure and properties for AZ31 magnesium alloy cast-rolled sheet in thermo-electropulsing rolling

Authors：

Unit：

KeyWords：

ClassificationCode：TG335

year,vol(issue):pagenumber：2025,50(1):113-121

Abstract：

The “non-thermal effect” is an important mechanism for improving the formability of magnesium alloys in thermo-electropulsing rolling (TER), which is excited by a specific temperature as the energy basis, but the excessively high preheating temperature suppresses the exertion of the “non-thermal effect”. Therefore, reasonable selection of preheating temperature becomes the key to magnesium alloy TER. In response to this issue, the influences of warm rolling process (WR) and thermo-electropulsing rolling (TER) at different preheating temperatures on the microstructure and mechanical properties of AZ31 magnesium alloy cast-rolled sheet were studied. The results show that the pulse current in TER can accelerate the dynamic recrystallization process and refine the uniform structure. The “non-thermal effect” of the pulse current has a strong correlation with the temperature, which can improve the mechanical properties of the rolled sheet by promoting recrystallization at a lower temperature and accelerate dislocation movement and vacancy diffusion inside the alloy. Within the preheating temperature of 150-300 ℃, the sample of TER process is superior to the sample of WR process in terms of tensile strength and elongation at the same preheating temperature. At 200 ℃, the comprehensive mechanical properties of the sheet in TER process are better. Compared with the sheet of WR process at the same preheating temperature, the tensile strength of TER process is increased by about 20.6% and the elongation is increased by about 232.9%.

Funds：

国家自然科学基金资助项目(52075357)；国家重点研发计划资助项目(2018YFA0707301)；山西省基础研究计划青年项目（202203021212313）

作者简介：白珊（1997-），女，硕士 E-mail：SSLLBS123@163.com 通信作者：高翔宇（1990-），男，博士，副教授 E-mail：2021103@tyust.edu.cn

Reference：

[1] Song G L, Bowles A L, Stjohn D H. Corrosion resistance of aged die cast magnesium alloy AZ91D [J]. Materials Science and Engineering: A, 2004, 366(1): 74-86.

[2] Barylski A, Aniolek K, Dercz G, et al. The effect of deep cryogenic treatment and precipitation hardening on the structure, micromechanical properties and wear of the Mg-Y-Nd-Zr alloy [J]. Wear, 2021, 468-469： 203587.

[3] Zhao J, Jiang B, Yuan Y, et al. Influence of Ca and Zn synergistic alloying on the microstructure, tensile properties and strain hardening of Mg-1Gd alloy [J]. Materials Science and Engineering: A, 2020, 785: 139344.

[4] Zhou S B, Liu T T, Tang A T, et al. Designing Mg alloys with high strength and ductility by reducing the strength difference between the basal and non-basal slips [J]. Materials & Design, 2023, 225:111476.

[5] Ahmad R, Yin B L, Wu Z X, et al. Designing high ductility in magnesium alloys [J]. Acta Materialia, 2019, 172: 161-184.

[6] Shen Y T, Ou X R, Chen Z J. Effect of additional shear stress on microstructure evolution of AZ31 sheet by differential speed rolling[J]. Materials Science Forum, 2015, 816:433-438.

[7] Vignesh P, Abraham A, Kumaran S. Texture-governed electrochemical behaviour of cross rolled Mg-5Al-5Sn (AT55) magnesium alloy [J]. Materials Chemistry and Physics，2022, 290: 126622.

[8] Zhi C C, Ma L F, Huang Q X, et al. Improvement of magnesium alloy edge cracks by multi-cross rolling [J]. Journal of Materials Processing Technology, 2018, 255: 333-339.

[9] Xue L, Liao C Z, Wu M X, et al. Improvement of mechanical properties and corrosion resistance of SLM-AlSi10Mg alloy by an eco-friendly electric pulse treatment [J]. Journal of Cleaner Production, 2024, 439: 140864.

[10]Liao C Z, Huang J, Xue L, et al. Another reason for plasticity enhancement of cold-deformed aluminium alloy induced by electric pulse treatment [J]. Materials Today Communications, 2023, 34: 104969.

[11]Gu S J, Liu C, Toku Y, et al. Ultrahigh deformability of Ti-6Al-4V assisted by high-density pulsed electric current treatment [J]. Journal of Alloys and Compounds, 2024, 973: 172892.

[12]Shan Z H, Bai J, Fan J F, et al. Exceptional mechanical properties of AZ31 alloy wire by combination of cold drawing and EPT [J]. Journal of Materials Science & Technology, 2020, 51: 111-118.

[13]Jiang Y B, Tang G Y, Shek C, et al. On the thermodynamics and kinetics of electropulsing induced dissolution of β-Mg17Al12 phase in an aged Mg-9Al-1Zn alloy [J]. Acta Materialia, 2009, 57(16): 4797-4808.

[14]Xu H, Wang Y P, Guo Z P, et al. Precipitation phase diffusion kinetics of AZ61 alloy under electrical pulse treatment [J]. Materials Characterization, 2022, 191: 112110.

[15]Xu H, Liu M, Wang Y P, et al. Refined microstructure and dispersed precipitates in a gradient rolled AZ91 alloy under pulsed current [J]. Materialia, 2021, 20: 101245.

Service：

【This site has not yet opened Download Service】【Add Favorite】