Microstructures and mechanical properties of a Cu–Zn alloy subjected to cryogenic dynamic plastic deformation

Xiao, Gang; Tao, Nengguo; Lu, K.

doi:10.1016/j.msea.2009.01.022

Cited by 117 publications

(47 citation statements)

References 31 publications

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“…Specifically, lower temperature and higher strain rate usually promote deformation twinning in nc fcc metals and alloys [103,104,252]. Zhao et al [153] reported that nanostructured Cu did not deform by twinning at room temperature but produced large quantity of deformation twins at liquid nitrogen temperature, verifying that the low temperature indeed promote deformation twinning in nanostructured materials.…”

Section: Strain Rate and Temperature Effectmentioning

confidence: 98%

“…The dynamic recovery process needs the climbing of dislocations, which is a thermally activated process [95]. It becomes slower at lower temperatures [28,[95][96][97][98][99][100][101][102][103][104], and this causes higher work-hardening rate, and consequently higher flow stress. At higher strain rate the overall work hardening rate increases because the dislocation generation rate is faster than the dislocation annihilation, which leads to the increase in flow stress.…”

Section: Temperature and Strain Rate Effectmentioning

confidence: 99%

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Deformation twinning in nanocrystalline materials

Zhu

Liao

2012

Progress in Materials Science

1,141

447

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Section: Strain Rate and Temperature Effectmentioning

confidence: 98%

Section: Temperature and Strain Rate Effectmentioning

confidence: 99%

Deformation twinning in nanocrystalline materials

Zhu

Liao

2012

Progress in Materials Science

1,141

447

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“…The shear bands could be activated in some regions with a large stress concentration and thermal softening. [10][11][12] The cold-forging process possesses a higher strain rate than other deformation-induced grain refinement fabrication techniques, such as ECAP and HPT. This high strain rate could contribute to the formation of localized shear bands in the CF samples.…”

Section: B Grain Refinement Mechanismmentioning

confidence: 99%

“…It was reported that the shear strain inside a shear band was proportional to its thickness. [11,12,32] Therefore, the wider the shear band, the higher the shear strain is and the finer the grains are. The fragmentized b/a¢¢ lamellae might be further broken and rotated in order to release the concentrated stress.…”

Section: B Grain Refinement Mechanismmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10][11][12] It is widely accepted that deformation-induced grain refinement mechanism of metals and alloys depends strongly on their crystal structure and stacking fault energy (SFE). [1] In body-centered cubic (bcc) metals with high SFE, such as Fe, [2] the dislocation walls and cells are formed to accumulate strain.…”

Section: Introductionmentioning

confidence: 99%

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Deformation-Induced Grain Refinement and Amorphization in Ti-10V-2Fe-3Al Alloy

Chen

Sun

Lin

et al. 2011

Metall Mater Trans A

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The microstructural evolution and grain refinement mechanisms of a Ti-10V-2Fe-3Al alloy, b-solution quenched and cold forged (CF) to strains of 0.1, 0.35, and 1.2 have been investigated using optical microscopy (OM), X-ray diffraction (XRD), and transmission electron microscopy (TEM). The results showed that the stress-induced martensitic transformation became a predominant deformation mode in the metastable Ti-10V-2Fe-3Al alloy during cold forging. These martensites a¢¢ repeatedly divided the original b parent phase into a large number of micronsized blocks when the forging strain was 0.1. Shear bands were observed to traverse a¢¢/b lamellae and resulted in a significant grain refinement of the b phase, as the forging strain increased to 0.35. The degree of grain refinement inside shear bands was higher than the outside. Nanocrystalline and amorphous structures were produced in local areas of the original b phase, when the forging strain rose to 1.2. This dramatic grain refinement in the metastable Ti-10V-2Fe-3Al alloy could be attributed to the stress-induced martensitic transformation promoting the initiation and growth of shear bands across a¢¢/b lamellae. More dislocations were produced and accumulated inside grains to accommodate plastic deformation. The crystal structure was collapsed and an amorphous structure was formed as soon as the dislocation density was accumulated to a critical value of 10 14 /cm 2 . Moreover, some of the reverse martensitic phase transformation, a¢¢fib, was observed to contribute to grain refinement of Ti-10V-2Fe-3Al alloy as well.

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Superior Cryogenic Tensile Strength and Ductility of In Situ Al–Cu Matrix Composite Reinforced with 0.3 wt% Nano‐Sized TiCp

et al. 2018

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In the present work, the tensile properties at 77 K of the 0.3 wt% nano‐sized TiCp/Al–Cu composite is investigated to explore its potential application at cryogenic temperature. The TiCp/Al–Cu composite exhibits superior ultimate tensile strength (620 MPa), yield strength (531 MPa), and fracture strain (7.2%) at 77 K. The addition of TiCp leads to the refinement of θ′ precipitates and enhanced dislocation strengthening effect, contributing to the improved tensile strength.

show abstract

Microstructures and mechanical properties of a Cu–Zn alloy subjected to cryogenic dynamic plastic deformation

Cited by 117 publications

References 31 publications

Deformation twinning in nanocrystalline materials

Deformation twinning in nanocrystalline materials

Deformation-Induced Grain Refinement and Amorphization in Ti-10V-2Fe-3Al Alloy

Superior Cryogenic Tensile Strength and Ductility of In Situ Al–Cu Matrix Composite Reinforced with 0.3 wt% Nano‐Sized TiCp

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