Superplastic deformation behavior of Mg alloys: A-review

Nazeer, Faisal; Long, Jianyu; Yang, Zhe; Li, Chuan

doi:10.1016/j.jma.2021.07.012

Cited by 60 publications

(20 citation statements)

References 68 publications

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“…Therefore, uses of lightweight materials are important to reduce the cost of the project and CO 2 emission into the environment. One of the prospective replacements is the magnesium (Mg) alloy, because the density (ρ~1.78 g cm −3 ) of Mg is 2/3 of the density of Al and 1/4 of the density of steel [4,5].…”

Section: Introductionmentioning

confidence: 99%

A Prospective Way to Achieve Ballistic Impact Resistance of Lightweight Magnesium Alloys

Malik

Nazeer

Wang

2022

Metals

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The ballistic impact resistance of lightweight magnesium alloys is an eye-catching material for the military and aerospace industries, which can decrease the cost of a project and the fuel consumption. The shockwave mitigation ability of a magnesium alloy is 100 times stronger than an aluminum alloy; nonetheless, ballistic impact resistance has still not been achieved against blunt and API projectiles. The major obstacles are the low hardness, low mechanical strength, basal texture and strain hardening ability under loading along the normal direction of the sheet. The high yield strength and ultimate strength can be achieved for a specific loading condition (tensile or compression) by adjusting the texture in magnesium alloys. The projectile impact along the normal direction in a strong basal-textured magnesium alloy can only produce a slip-induced deformation or minor twinning activity. Here, we propose a practical technique that can be valuable for altering the texture from c-axes//ND to c-axes//ED or TD, and can produce high strain hardening and high strength through a twinning and de-twinning activity. Subsequently, it can improve the ballistic impact resistance of magnesium alloys. The effect of the technique on the evolution of the microstructure and possible anticipated deformation mechanisms after ballistic impact is proposed and discussed.

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Section: Introductionmentioning

confidence: 99%

A Prospective Way to Achieve Ballistic Impact Resistance of Lightweight Magnesium Alloys

Malik

Nazeer

Wang

2022

Metals

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“…GBS is generally deemed to be an important mechanism to obtain high ductility, even super-plasticity, further deteriorating the strength [ 14 , 15 ]. Fine grain size, high deformation temperature, and low strain rate are beneficial for its occurrence.…”

Section: Resultsmentioning

confidence: 99%

“…In general, in comparison to the as-cast state, as-extruded alloys exhibit a more homogeneous structure, more refined grain size, stronger texture component, and more plentiful dynamic precipitates. A uniform fine-grained structure is bad for high-temperature strength due to grain boundary sliding (GBS) [ 14 , 15 ]. On the contrary, a certain number of precipitates inhibit the motion of dislocations to some extent, guaranteeing high strength during hot deformation [ 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Bi Addition on the Heat Resistance of As-Extruded AZ31 Magnesium Alloy

et al. 2023

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In this work, we investigate the impact of Bi addition on the heat resistance of as-extruded AZ31 alloy during high-temperature annealing and hot compression. Electron backscattered diffraction (EBSD) technique and quasi in situ scanning electron microscopy (SEM) are used to analyze the evolution of microstructures during high-temperature annealing and hot compression, respectively. The test results show that with a prolonged annealing time, the as-extruded AZB313 alloy exhibited a lower grain growth rate, due to the pinning effect of Mg3Bi2 phases distributed at grain boundaries. On the other hand, as the compressive temperature increased, the downtrend of strength is delayed in the as-extruded AZB313 alloy. Thermally stable Mg3Bi2 phases dispersed within the grains act as barriers, hindering the motion of dislocations, which not only provides a more effective precipitation strengthening effect, but also increases the resistance to deformation of grains. Moreover, grain boundary sliding can also be restricted by Mg3Bi2 phases located at grain boundaries. This work provides a new idea for the development of heat-resistant wrought Mg alloys.

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“…By analyzing the stress–strain curves at different temperatures and deformation rates, it was found that the mechanism of superplastic deformation instability was intragranular slip because of the small value of significant strain rate sensitivity ( m ) and hardening exponent ( n ). Nazeer et al [ 79 ] also suggested that, for a very fine grain size which has uniform microstructure, the conditions of high m , low n , and thermal stability are necessary to achieve super-plasticity. It was found that the elongation of the WE54 Mg alloy reached 726% at 400 °C.…”

Section: Deformation Instability Induced By Characteristics Of Materialsmentioning

confidence: 99%

Theory, Method and Practice of Metal Deformation Instability: A Review

Wan

Yao

et al. 2023

Materials

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Deformation instability is a macroscopic and microscopic phenomenon of non-uniformity and unstable deformation of materials under stress loading conditions, and it is affected by the intrinsic characteristics of materials, the structural geometry of materials, stress state and environmental conditions. Whether deformation instability is positive and constructive or negative and destructive, it objectively affects daily life at all times and the deformation instability based on metal-bearing analysis in engineering design has always been the focus of attention. Currently, the literature on deformation instability in review papers mainly focuses on the theoretical analysis of deformation instability (instability criteria). However, there are a limited number of papers that comprehensively classify and review the subject from the perspectives of material characteristic response, geometric structure response, analysis method and engineering application. Therefore, this paper aims to provide a comprehensive review of the existing literature on metal deformation instability, covering its fundamental principles, analytical methods, and engineering practices. The phenomenon and definition of deformation instability, the principle and viewpoint of deformation instability, the theoretical analysis, experimental research and simulation calculation of deformation instability, and the engineering application and prospect of deformation instability are described. This will provide a reference for metal bearing analysis and deformation instability design according to material deformation instability, structural deformation instability and localization conditions of deformation instability, etc. From the perspective of practical engineering applications, regarding the key problems in researching deformation instability, using reverse thinking to deduce and analyze the characteristics of deformation instability is the main trend of future research.

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Superplastic deformation behavior of Mg alloys: A-review

Cited by 60 publications

References 68 publications

A Prospective Way to Achieve Ballistic Impact Resistance of Lightweight Magnesium Alloys

A Prospective Way to Achieve Ballistic Impact Resistance of Lightweight Magnesium Alloys

Effect of Bi Addition on the Heat Resistance of As-Extruded AZ31 Magnesium Alloy

Theory, Method and Practice of Metal Deformation Instability: A Review

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