Twinning behavior and lattice rotation in a Mg–Gd–Y–Zr alloy under ballistic impact

Shi, Xiaoying; Luo, Alan A.; Sutton, Scott C.; Zeng, Long; Wang, Shiyi; Zeng, Xiaoqin; Li, Dejiang; Ding, Wei

doi:10.1016/j.jallcom.2015.08.020

Cited by 34 publications

(6 citation statements)

References 52 publications

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“…However, for military applications, the standardized 7.62 mm projectile with a different nose (blunt and API) was required. In another study, Shi et al [28] conducted a ballistic impact test by using 7.62 mm T12 steel on a forged Mg-Gd-Y-Zr (wt.%) alloy but at a low velocity of 400 m/s. One of the projectiles completely perforated, but the other one stayed intact at the rear edge of the sheet.…”

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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“…The grain sizes of NSG1 and NSG2 were ~80 nm. Both the boundary 1 (B1) of NSG1 and the boundary 3 (B3) of NSG2 had a misorientation of about 78°, which belongs to an abnormal {101 2} tension twin boundary [23,24]. The Figure 6a,d show the NSGs (indicated as "NSG1" and "NSG2", respectively) formed in HS-3 and E9S-1 samples, respectively.…”

Section: After Three-pass Swagingmentioning

confidence: 99%

“…The grain sizes of NSG1 and NSG2 were ~80 nm. Both the boundary 1 (B 1 ) of NSG1 and the boundary 3 (B 3 ) of NSG2 had a misorientation of about 78 • , which belongs to an abnormal {1012} tension twin boundary [23,24]. The deviation of the angle from the common 86 • was considered to be a result of the accommodation of local strain after twinning [23,24].…”

Section: After Three-pass Swagingmentioning

confidence: 99%

“…Both the boundary 1 (B 1 ) of NSG1 and the boundary 3 (B 3 ) of NSG2 had a misorientation of about 78 • , which belongs to an abnormal {1012} tension twin boundary [23,24]. The deviation of the angle from the common 86 • was considered to be a result of the accommodation of local strain after twinning [23,24]. Moreover, NSG1 and NSG2 both had high-angle grain boundaries, namely B 2 (~11 • ) in NSG1 and B 4 (~41 • ), B 5 (~29 • ), and B 6 (~17 • ) in NSG2.…”

Section: After Three-pass Swagingmentioning

confidence: 99%

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The Effect of Initial Grain Size on the Nanocrystallization of AZ31 Mg Alloy during Rotary Swaging

Chen

Wan

2022

Materials

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Nanograins were obtained in the AZ31 Mg alloy bars with different initial grain sizes via cold rotary swaging. Microstructure evolution during deformation was investigated through electron backscatter diffraction analysis and transmission electron microscopy studies. The results indicate that initial grain size had little effect on the mechanism of grain refinement during swaging. The nanocrystallization process of the alloys with different initial grain sizes included extensive twinning followed by the further refinement of the twin lamellae through the formation of massive dislocation arrays. However, as the initial grain size decreased, the formation rate of nanograins increased, resulting in a higher degree of nanocrystallization after the same swaging pass. The mean grain size and yield strength of the sample with the smallest initial grain size were about 91 nm and 489 MPa, respectively. The slower rate and lower degree of nanocrystallization in the alloy with a larger initial grain size were mainly attributed to the less grain boundary areas and higher activity of twinning.

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“…It was noticed that precipitates with a high density such as disk-like β' 2 in the ZK series of Mg alloys can prohibit the propagation of {10-12}<−1011> twinning and harden extension twinning more than prismatic slip, leading to the dramatic suppression of yield asymmetry [10,29,30]. Rare-earth (RE) elements can weaken textures and suppress the extension twinning by solid solution strengthening in wrought magnesium alloys and as a result, the yield asymmetry is reduced [10,19,[29][30][31][32]38]. For example, in WE43 and WE54 Mg alloys, after adding a range of RE elements, the plastic anisotropy is decreased, which is proven to be related to an increase of the CRSS value for twinning [19,[29][30][31][32][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Reducing Yield Asymmetry between Tension and Compression by Fabricating ZK60/WE43 Bimetal Composites

Zhao

Song

et al. 2020

Materials

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In this study ZK60/WE43 bimetal composite rods were manufactured by a special method of hot diffusion and co-extrusion. Interface microstructure, deformation mechanism, and yield asymmetry between tension and compression for the composite rods were systematically investigated. It was observed that the salient deformation mechanism of the ZK60 constituent was {10-12}<−1011> extension twinning in compression and prismatic slip in tension, and different deformation modes resulted in yield asymmetry between tension and compression. In contrast, the WE43 constituent tends to be more isotropic due to grain refinement, texture weakening, solid-solution and precipitation strengthening, which were deformed via basal slip, prismatic slip, and {10-12}<−1011> extension twinning in both tension and compression. Surprisingly, it was found that yield asymmetry between tension and compression for the ZK60/WE43 composite rods along the extrusion direction was effectively reduced with a compression-to-tension ratio of ~0.9. The strongly bonded interface acting as a stress transfer medium for the ZK60 sleeve and WE43 core exhibited the coordinated deformation behavior. This finding provides an effective method to decrease the yield asymmetry between tension and compression in the extruded magnesium alloys.

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Twinning behavior and lattice rotation in a Mg–Gd–Y–Zr alloy under ballistic impact

Cited by 34 publications

References 52 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

The Effect of Initial Grain Size on the Nanocrystallization of AZ31 Mg Alloy during Rotary Swaging

Reducing Yield Asymmetry between Tension and Compression by Fabricating ZK60/WE43 Bimetal Composites

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