Activation of multiple twins by pre-tension and compression to enhance the strength of Mg–3Al–1Zn alloy plates

Song, Bo; Zheng, Xin; Chen, Gang; Liu, Qing

doi:10.1016/j.msea.2014.10.061

Cited by 31 publications

(7 citation statements)

References 14 publications

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“…In our previous review article [14], it was summarized that the pre-strain level increased the yield strength (YS) of the Mg alloys; therefore, the strain up to 0.1 led to a remarkable increase in the YS of the ZK-based Mg alloy. The texture -c axes ND ⊥ and the loading along with the ND led to the sigmoidal shape curve, which is the signature of twinning-induced deformation; however, the sigmoidal shape curve correlates with the twinning and de-twinning phenomenon [35,[38][39][40][41]. In addition, twinning boundaries subdivide the parent grains into the number of grains, especially in an multi-variant extension twinning alloy, which can also facilitate the increase in the compressive yield strength (CYS) [14].…”

Section: Proposed Solution and Anticipated Deformation Mechanismmentioning

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: Proposed Solution and Anticipated Deformation Mechanismmentioning

confidence: 99%

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

Malik

Nazeer

Wang

2022

Metals

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“…Some works also found that pre-twinning deformation promotes continuous precipitation and suppresses the discontinuous precipitation in AZ80 and AZ91 alloys [ 8 , 11 , 17 ]. In addition, dislocations, textural change and twin lamellae via cold deformation can also be used to tailor strength-toughness properties and anisotropy of Mg alloys [ 18 , 19 ]. Therefore, the combined use of cold deformation and aging treatment has become a new strategy to fabricate Mg alloys with good properties.…”

Section: Introductionmentioning

confidence: 99%

“…In previous studies, pre-cold deformation is usually carried out by pre-tension, pre-compression and pre-rolling [ 8 , 9 , 10 , 19 , 20 , 21 ]. Recently, it has been found that torsion deformation is somewhat superior for improving the mechanical properties of rod-shaped materials [ 22 , 23 , 24 , 25 , 26 , 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

Improving Tensile and Compressive Properties of an Extruded AZ91 Rod by the Combined Use of Torsion Deformation and Aging Treatment

et al. 2017

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In this study, AZ91 magnesium alloy rods were used to investigate the effects of torsion deformation on microstructure and subsequent aging behavior. Extruded AZ91 rod has a uniform microstructure and typical fiber texture. Torsion deformation can generate a gradient microstructure on the cross-section of the rod. After torsion, from the center to the edge in the cross-section of the rod, both stored dislocations and area fraction of {10-12} twins gradually increase, and the basal pole of the texture tends to rotate in the ED direction. Direct aging usually generates coarse discontinuous precipitates and fine continuous precipitates simultaneously. Both twin structures and dislocations via torsion deformation can be effective microstructures for the nucleation of continuous precipitates during subsequent aging. Thus, aging after torsion can promote continuous precipitation and generate gradient precipitation characteristics. Both aging treatment and torsion deformation can reduce yield asymmetry, and torsion deformation enhances the aging hardening effect by promoting continuous precipitation. Therefore, combined use of torsion deformation and aging treatment can effectively enhance the yield strength and almost eliminate the yield asymmetry of the present extruded AZ91 rod. Finally, the relevant mechanisms are discussed.

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“…The twinning also resulted in the randomization of basal texture. It has been already suggested by numerous studies that the twinning can result in the randomization of the basal texture due to the re-orientation of the parent grains [10][11]. Furthermore, the twinning induced grain refinement was observed, where grain size was reduced to almost half of the original grain size of undeformed sample (Fig.…”

Section: Resultsmentioning

confidence: 80%

Effect of pre-twinning on microstructure and texture evolution in room and cryogenically deformed Mg-0.5Ca alloy

Chaudry

Noh

Han

et al. 2022

J. Phys.: Conf. Ser.

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Introducing {10-12} tension twin lamellas has proved to be the most effective strategy to enhance the performance of Mg alloys. Twins can provide the preferential nucleation sites for recrystallization, hence twinning induced grain refinement can result in higher strength material based on Hall-Petch Effect. In addition, twinning can also modify the crystallographic c-axis distribution in wrought Mg alloys resulting in lower plastic anisotropy. Accordingly, in the present work, the twinning evolution in the Mg-0.5Ca (wt.%) alloy at room and cryogenic temperature was critically investigated. The samples were subjected to pre-compression (5%) at room temperature and -150 °C at the strain rate of 10-3 s-1. The microstructural and textural characterization was carried out using OM, SEM and EBSD to emphasize the twinning evolution during compression at room and low temperatures. The local lattice distortion and the localized deformation in terms of Kernel average misorientation (KAM) was also studied. The results revealed the significant grain refinement (13.7 μm 5.61 μm and 6.02 μm of uncompressed and RT, - 150 °C pre-compressed, respectively), where slightly enhanced twinning fraction in the sample compressed at RT was observed. Finally, remarkable increase in the yield strength was noticed in the pre-twinned samples, which was attributed to the twinning-induced grain refinement based on the Hall-Petch relationship.

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Activation of multiple twins by pre-tension and compression to enhance the strength of Mg–3Al–1Zn alloy plates

Cited by 31 publications

References 14 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

Improving Tensile and Compressive Properties of an Extruded AZ91 Rod by the Combined Use of Torsion Deformation and Aging Treatment

Effect of pre-twinning on microstructure and texture evolution in room and cryogenically deformed Mg-0.5Ca alloy

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