Superplasticity in a multi-directionally forged Mg–Li–Zn alloy

Mehrabi, Amir Mohammad Rasekh; Mahmudi, R.; Miura, Hiromi

doi:10.1016/j.msea.2019.138274

Cited by 31 publications

(3 citation statements)

References 32 publications

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“…17) The latters successfully demonstrated superplasticity of AZ91Mg alloy processed by equal-channel-angular pressing at further lower temperature of 423 K. 18) Mehrabi et al investigated superplastic behavior of MDFed MgLi Zn alloys between 498 K and 573 K and reported change in the m value from 0.29 to 0.51 depending on grain size and testing conditions. 19) Still more, Miura et al reported superplasticity even at 373 K of UFGed AZ61Mg alloys with an average grain size of 0.3 µm. 5) Consequently, the superplasticity of Mg alloys can occur at lower temperatures when grain size becomes approximately less than a few micrometers and it becomes easier with decreasing grain size.…”

Section: Warm Extrusion Of the Mdfed Az80mg Alloysmentioning

confidence: 99%

Multi-Directional Forging and Warm Extrusion of AZ80Mg Alloys

et al. 2021

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A commercial hot-extruded AZ80Mg alloy was multi-directionally forged (MDFed) to a cumulative strain of ¦¾ = 5.6 at maximum under decreasing temperature conditions from 623 K down to 433 K at an initial strain rate of 3.0 © 10 ¹3 s ¹1 . In addition to the above MDFing method, a simplified MDFing method, i.e., MDFing under two-step decreasing temperature conditions, was proposed and applied. These MDFing led to homogeneous grain refinements to have average grain sizes down to 0.6 µm. The MDFed Mg alloys were further extruded to form plates and tubes at temperatures between 453 K and 523 K at various initial strain rates from 3.0 © 10 ¹4 s ¹1 to 1.0 © 10 ¹2 s ¹1 . Extrusions of the MDFed AZ80Mg alloys were successfully carried out even at such relatively low temperatures. Under some conditions, the strain-rate sensitivity of the flow stress exceeded 0.3, which suggested occurrence of superplastic deformation. By the above warm extrusion employing superplasticity accompanied by work hardening, high-strength AZ80Mg alloy tubes with tensile strength over 400 MPa could be successfully fabricated.

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Section: Warm Extrusion Of the Mdfed Az80mg Alloysmentioning

confidence: 99%

Multi-Directional Forging and Warm Extrusion of AZ80Mg Alloys

et al. 2021

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“…accumulative roll bonding (ARB) and multi-directional forging (MDF) [15,[29][30][31][32][33][34][35].…”

Section: Strengthening By Workingmentioning

confidence: 99%

Review - Materials Design for Improving Mechanical Properties of Ultra-Lightweight Mg-Li Based Alloys

Mineta

2024

Mater. Trans.

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Mg-Li based alloys, distinguished by their low density among structural metallic materials, emerge as pivotal candidates in ushering in the era of next-generation lightweight metals. Their notable drawbacks encompass poor room-temperature strength and creep resistance, prompting diverse efforts to enhance these aspects through microstructure control techniques, including heat treatment. The amelioration of mechanical properties in Mg-Li based alloys holds significant promise for advancing various industries, spanning aerospace, automotive, and biomaterials sectors. This review article provides an overview of endeavors aimed at improving the mechanical properties of Mg-Li based alloys, with a specific focus on alloying, heat treatment, and severe plastic deformation as strategies for microstructure control.

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“…Severe plastic deformation, as an effective grain refinement means, has attracted extensive attention of researchers over the past decades [ 10 , 11 ]. According to our survey, severe plastic deformation such as equal channel angular pressing [ 12 , 13 , 14 ], high-pressure torsion [ 15 , 16 ], friction stir processing [ 17 , 18 ], multidirectional forging (MDF) [ 19 ], and differential speed rolling [ 20 ] have been used in binary Mg-8Li alloy and Mg-Li-Zn alloys to achieve fine-grain and ultra-fine grain refinement and obtain superplasticity. In addition, extrusion-rolling was used in the Mg-8Li alloy to realize grain refinement and superplasticity [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

High Strain Rate Quasi-Superplasticity Behavior in an Ultralight Mg-9.55Li-2.92Al-0.027Y-0.026Mn Alloy Fabricated by Multidirectional Forging and Asymmetrical Rolling

et al. 2022

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To explore new approaches to severe plastic deformation and the ductility of a multicomponent magnesium–lithium alloy, an ultralight microduplex Mg-9.55Li-2.92Al-0.027Y-0.026Mn alloy was made by novel multidirectional forging and asymmetrical rolling, and the superplasticity behavior was investigated by optical microscope, hot tensile test, and modeling. The average grain size is 1.9 μm in this alloy after multidirectional forging and asymmetrical rolling. Remarkable grain refinement caused by such a forming, which turns the as-cast grain size of 144.68 μm into the as-rolled grain size of 1.9 μm, is achieved. The elongation to failure of 228.05% is obtained at 523 K and 1 × 10−2 s−1, which demonstrates the high strain rate quasi-superplasticity. The maximum elongation to failure of 287.12% was achieved in this alloy at 573 K and 5 × 10−4 s−1. It was found that strain-induced grain coarsening at 523 K is much weaker than the strain-induced grain coarsening at 573 K. Thus, the ductility of 228.05% is suitable for application in high strain rate superplastic forming. The stress exponent of 3 and the average activation energy for deformation of 50.06 kJ/mol indicate that the rate-controlling deformation mechanism is dislocation-glide controlled by pipe diffusion.

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Superplasticity in a multi-directionally forged Mg–Li–Zn alloy

Cited by 31 publications

References 32 publications

Multi-Directional Forging and Warm Extrusion of AZ80Mg Alloys

Multi-Directional Forging and Warm Extrusion of AZ80Mg Alloys

Review - Materials Design for Improving Mechanical Properties of Ultra-Lightweight Mg-Li Based Alloys

High Strain Rate Quasi-Superplasticity Behavior in an Ultralight Mg-9.55Li-2.92Al-0.027Y-0.026Mn Alloy Fabricated by Multidirectional Forging and Asymmetrical Rolling

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