Deformation twinning in silver-gold alloys

Suzuki, Hideji; Barrett, C. S.

doi:10.1016/0001-6160(58)90002-6

Cited by 195 publications

(38 citation statements)

References 3 publications

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“…These experimental results are explained by an increase in stacking fault energy, which increases the critical stress for the onset of deformation twinning. [38][39][40][41] However, the deformation twin fraction in the < 144 > tensile orientations after the 15% deformation did not change with increasing carbon concentration, 7) despite the increase in the stacking fault energy mentioned above. In addition, deformation twinning occurred after the 20% tensile deformation at 473 K in the < 122 > and < 133 > tensile orientations of the Fe-18Mn-1.2C steel, as demonstrated in Fig.…”

Section: Deformation Twinning and Stacking Fault Energymentioning

confidence: 88%

Deformation Twinning Behavior of Twinning-induced Plasticity Steels with Different Carbon Concentrations – Part 2: Proposal of Dynamic-strain-aging-assisted Deformation Twinning

2015

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In a previous study, the carbon concentration dependence of the deformation twinning behavior in twinning-induced plasticity steels was investigated, which clarified that the deformation twin fraction in the < 144 > tensile orientation did not change with the carbon concentration. In this study, twinning deformation occurred in the Fe-18Mn-1.2C steel at 473 K with a relatively high stacking fault energy of 55 mJ/m 2 . To explain these experimental results, dynamic strain aging of Shockley partials dislocations was proposed as an additional contributing factor to assist the deformation twinning in high-carbon-added austenitic steels. Most abnormalities concerning deformation twinning such as the high stacking fault energy in Fe-Mn-C austenitic steels were interpreted by considering the effect of dynamic strain aging.KEY WORDS: deformation twinning; dynamic strain aging; austenitic steel; electron backscatter diffraction (EBSD).

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Section: Deformation Twinning and Stacking Fault Energymentioning

confidence: 88%

Deformation Twinning Behavior of Twinning-induced Plasticity Steels with Different Carbon Concentrations – Part 2: Proposal of Dynamic-strain-aging-assisted Deformation Twinning

2015

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“…A number of nucleation and growth mechanisms have been proposed and their description transcends the scope of this paper. Nucleation mechanisms for FCC metals were suggested by Suzuki and Barrett [36], Haasen and King [37], Miura et al [38], Cohen and Weertman [39], Venables [40,41], Sleeswik [42], Mahajan and Chin [43], Bolling and Richman [44], and others. For BCC metals, Cottrell and Bilby [45], Sleeswyk [46], and Hirth [47] proposed new or modified some of the existing mechanisms.…”

Section: The Twinning Stressmentioning

confidence: 99%

“…Suzuki and Barrett [36] and Venables [40,41] proposed relationships between the SFE g SF and the twinning stress t T . It is well known that the twinning stress increases with increasing SFE.…”

Section: Effect Of Stacking-fault Energymentioning

confidence: 99%

The onset of twinning in metals: a constitutive description

Vöhringer²,

2001

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Abstract-A constitutive approach is developed that predicts the critical stress for twinning as a function of external (temperature, strain rate) and internal (grain size, stacking-fault energy) parameters. Plastic deformation by slip and twinning are considered as competitive mechanisms. The twinning stress is equated to the slip stress based on the plastic flow by thermally assisted movement of dislocations over obstacles, which leads to successful prediction of the slip-twinning transition. The model is applied to body centered cubic, face centered cubic, and hexagonal metals and alloys: Fe, Cu, brasses, and Ti, respectively. A constitutive expression for the twinning stress in BCC metals is developed using dislocation emission from a source and the formation of pile-ups, as rate-controlling mechanism. Employing an Eshelby-type analysis, the critical size of twin nucleus and twinning stress are correlated to the twin-boundary energy, which is directly related to the stacking-fault energy (SFE) for FCC metals. The effects of grain size and SFE are examined and the results indicate that the grain-scale pile-ups are not the source of the stress concentrations giving rise to twinning in FCC metals. The constitutive description of the slip-twinning transition are incorporated into the Weertman-Ashby deformation mechanism maps, thereby enabling the introduction of a twinning domain. This is illustrated for titanium with a grain size of 100 µm. 

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“…Typically, deformation twinning is commonly observed in hexagonal close-packed (HCP) crystal due to its inherent low number of active dislocation slip systems. TWIP is relatively rare for the FCC crystal structure materials, but it has been reported that deformation twinning can indeed occur in Ag-Au alloy at cryogenic temperature (77.3 K) [47] and in nano-crystalline Al [48] due to the suppression of the normal full dislocation gliding. If assuming the FCC deformation twins nucleate from perfect slip dislocations, an increase of the yield stress would be expected from a previous theoretical model [49], however, the current experimental facts have shown otherwise.…”

Section: Enhanced Ductilitymentioning

confidence: 99%