Microstructures, strengthening mechanisms and fracture behavior of Cu–Ag alloys processed by high-pressure torsion

Tian, Yanzhong; Li, J.J.; Zhang, P.; Sheng, Wu; Zhang, Z.F.; Kawasaki, Megumi; Langdon, Terence G.

doi:10.1016/j.actamat.2011.09.058

Cited by 77 publications

(29 citation statements)

References 51 publications

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“…The formation of metastable phases in Mg/Ti during HPT processing can be due to the following reasons: (i) effect of strain on atomic-scale mixing of elements and formation of supersaturated solid solutions [29][30][31][32]; and (ii) effect of grain size on the stability of phases [57,63]. The effect of strain can be due to both or either direct influence of strain on the mechanical mixing of two elements [45] and/or indirect effect of strain through the formation of high densities of lattice defects [25,26,43].…”

Section: Resultsmentioning

confidence: 99%

“…Processing of Mg-Ti through severe plastic deformation (SPD) techniques [25,26] can be an approach to synthesize bulk samples of Mg-Ti alloys. The SPD techniques are not only free from contamination, but they also are quite effective for enhancing atomic diffusion [27,28], mixing elements at the atomic scale [29][30][31], synthesizing intermetallics [32], enhancing phase transformations [33][34][35] and improving hydrogen storage properties [36][37][38][39][40][41][42].…”

Section: Introductionmentioning

confidence: 99%

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Formation of metastable phases in magnesium–titanium system by high-pressure torsion and their hydrogen storage performance

et al. 2015

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Formation of metastable phases in magnesium–titanium system by high-pressure torsion and their hydrogen storage performance

et al. 2015

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“…In Cu-Ag composites, but also in several other nanocomposites, the optimum between strength and ductility is obtained in lamellar structures. [83,84] For applications which demand high electrical conductivity combined with high strength and ductility, the electrical conductivity À usually lowered by defects and grain boundaries À might be recovered by subsequent annealing treatments of the as-deformed composites. Further improvements might be achieved by adjusting bimodal grain or phase size distributions.…”

Section: Discussionmentioning

confidence: 99%

Deformation‐Induced Supersaturation in Immiscible Material Systems during High‐Pressure Torsion

2016

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The review focuses on the supersaturation process of immiscible elements induced by high-pressure torsion deformation. A variety of investigated material systems offers the systematic analysis of the controlling factors for mechanical intermixing, which are mainly determined by the level of the positive heat of mixing and the deformation behavior. The homogeneity of the deformation process strongly influences the degree of supersaturation. Our results show that the fundamental mixing mechanism during deformation is not necessarily the same in all systems, but depends also on the strength differences of the phases and accordingly the deformation behavior.

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“…[4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Earlier investigations, thoroughly summarized in [2], showed that the strength properties increase as the number of turns and/or the pressure increases.…”

Section: Introductionmentioning

confidence: 99%

Tem Study of Recrystallization in Ultra-Fine Grain AA3104 Alloy Processed by High-Pressure Torsion

Paul¹,

Morawiec²,

Baudin³

et al. 2015

Archives of Metallurgy and Materials

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The effect of annealing on the microstructure and the texture development was investigated in a particle containing AA3104 aluminium alloy. The samples were processed at room temperature by high-pressure torsion (HPT) up to ten turns. The nucleation of new grains was analyzed by a transmission electron microscope equipped with a system for local orientation measurements and a heating holder.The shear deformation induces a decrease of the grain size. After the first two turns of the HPT processing the initial structure of large grains was 'transformed' into a structure of fine cells/grains with the diameter of a few tens of nanometers. In the central areas of the samples the elongated shape of the cells/grains was observed up to six turns. For higher deformations, this structural inhomogeneity was totally removed and only the equiaxed grains were observed. The crystal lattice of small grains rotates in such a way that the <111> direction is parallel to the compression axis. After annealing the structure coarsened. Nevertheless, after primary recrystallization, the structure was still composed of relatively fine and equiaxed grains of a similar size. In most of the observed cases the size of the recrystallized grains in the areas close to and far from the large second phase particles was similar. The recrystallization leads to the creation of new texture components. The new grain orientations lost the positions typically observed in the deformed state and showed the tendency for the coincidence of the <100> crystallographic directions with the compression axis.Keywords: High Pressure Torsion, AA3104 alloy, TEM orientation mapping, Texture, Microstructure W pracy analizowano wpływ warunków wyżarzania na zmiany mikrostrukturalne i teksturowe w stopie AA3104 zawierającym wydzielenia cząstek drugiej fazy. Próbki odkształcano z wykorzystaniem techniki skręcania pod wysokim ciśnieniem (HPT), do dziesięciu obrotów, w temperaturze otoczenia. Proces zarodkowania nowych ziaren analizowano z wykorzystaniem transmisyjnej mikroskopii elektronowej wyposażonej w system pomiaru orientacji lokalnych oraz 'heating holder'.Zaobserwowano, że w miarę wzrostu liczby obrotów, intensywne ścinanie prowadzi do silnego zmniejszenia wielkości ziarna. Po dwu obrotach, wyjściowa struktura dużych ziaren uległa przekształceniu w strukturę drobnoziarnistą złożoną z ziaren o wielkości kilkudziesięciu nanometrów. W obszarach próbki zbliżonych do osi obrotu wydłużony kształt ziaren obserwowano do sześciu obrotów. W zakresie wyższych stopni odkształcenia ta niejednorodność strukturalna zanika; obserwowano jedynie równoosiowe ziarna. Orientacja sieci krystalicznej tych ziaren formuje silną teksturę osiową z kierunkiem <111> usytuowanym równolegle do kierunku normalnego (osi ściskania/skręcania). Po wyżarzaniu struktura ulega 'pogrubieniu'. Jednakże, w zakresie rekrystalizacji pierwotnej, w dalszym ciągu pozostaje równoosiowa i silnie rozdrobniona. W większości obserwowanych przypadków wielkość zrekrystalizowanych ziaren w obszarach położonych zarówno ...

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Microstructures, strengthening mechanisms and fracture behavior of Cu–Ag alloys processed by high-pressure torsion

Cited by 77 publications

References 51 publications

Formation of metastable phases in magnesium–titanium system by high-pressure torsion and their hydrogen storage performance

Formation of metastable phases in magnesium–titanium system by high-pressure torsion and their hydrogen storage performance

Deformation‐Induced Supersaturation in Immiscible Material Systems during High‐Pressure Torsion

Tem Study of Recrystallization in Ultra-Fine Grain AA3104 Alloy Processed by High-Pressure Torsion

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