Hot Deformation Behavior and Superplastic Extrusion Forming of Magnesium-lithium Alloys

LYU Yunxiang; DONG Ying; FU Wenliang; GAO Shiqing; XIA Xiangsheng; LU Zhen

doi:10.3969/j.issn.1674-6457.2025.08.006

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (8) : 52-59. DOI: 10.3969/j.issn.1674-6457.2025.08.006

Light Alloy Forming

Hot Deformation Behavior and Superplastic Extrusion Forming of Magnesium-lithium Alloys

LYU Yunxiang¹, DONG Ying^2,*, FU Wenliang³, GAO Shiqing⁴, XIA Xiangsheng⁴, LU Zhen^1,*

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Abstract

The work aims to realize the high-performance forming of magnesium-lithium alloy components through plastic forming processes. The hot deformation behavior of as-cast LAZ931 magnesium-lithium alloys at various temperatures and strain rates was investigated via hot compression tests. Magnesium-lithium alloy forgings were fabricated by multi-directional forging technology and formed through isothermal superplastic extrusion. The as-cast magnesium-lithium alloy demonstrated excellent hot deformation performance, but it was prone to instability at low temperatures and high strain rates, and the zone of hot processing instability gradually expanded with the increase in deformation. Multi-directional forging could significantly refine the two-phase microstructure through dynamic recrystallization, allowing the alloy to acquire good superplastic deformation ability. The elongation and flow resistance of the forged alloy at 300 ℃ and a strain rate of 5×10^-4 s^-1 reached over 200% and approximately 8 MPa, respectively. The forming of cylinder components was accomplished through superplastic extrusion forming. After forming, the mechanical room temperature yield strength, tensile strength, and elongation reached approximately 163 MPa, 197 MPa, and 22%, respectively, which increased by 20.7%, 19.4%, and 83%, respectively, compared to those of the as-cast alloy. The hot deformation behavior of magnesium-lithium alloys is investigated through hot compression deformation. Its flow stress decreases with the rise in temperature and increases with the increase in strain rate, presenting a positive strain rate sensitivity. Cylinder structures of magnesium-lithium alloys with favorable comprehensive properties can be prepared by superplastic isothermal extrusion.

Key words

magnesium-lithium alloy / superplastic forming / hot processing map / microstructure morphology

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LYU Yunxiang, DONG Ying, FU Wenliang, GAO Shiqing, XIA Xiangsheng, LU Zhen. Hot Deformation Behavior and Superplastic Extrusion Forming of Magnesium-lithium Alloys[J]. Journal of Netshape Forming Engineering. 2025, 17(8): 52-59 https://doi.org/10.3969/j.issn.1674-6457.2025.08.006

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