The variation of dislocation density as a function of the stacking fault energy in shock-deformed FCC materials

Rohatgi, Aashish; Vecchio, Kenneth S.

doi:10.1016/s0921-5093(01)01702-6

Cited by 73 publications

(46 citation statements)

References 20 publications

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“…These results are plotted in Figure 12 [ [13][14][15]. Both deformation twinning and stacking-fault energy formation are the direct consequence of partial dislocation nucleation and expansion.…”

Section: Tem Of Pure Coppermentioning

confidence: 99%

“…The measured values are shown in Table 2. This difference in the hardness measurements is attributed to grain size strengthening in the polycrystalline material used by Rohatgi et al [13][14][15] To achieve greater resolution, several samples were also examined by nanoindentation. Figure 14 Table 2 summarizes the results of the hardness measurements for both techniques by giving the maximum values obtained.…”

Section: Effect Of Pressure Decay On Mechanical Propertiesmentioning

confidence: 99%

“…On the other hand, if the stacking-fault energy is relatively high, the tendency to cross-slip allows perfect dislocations to be the main contributor to plastic deformation. Rohatgi et al [13][14][15] quantified the dislocation density as a function of stacking-fault energy in shock-deformed Cu-Al alloys using a variety of techniques including Differential Scanning Calorimetry. The dislocation density in their shocked samples decreased with decrease in stacking-fault energy suggesting a change in deformation mechanism from slip to twinning.…”

Section: Introductionmentioning

confidence: 99%

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Deformation Substructures and Their Transitions in Laser Shock–Compressed Copper-Aluminum Alloys

Meyers

Schneider

Jarmakani

et al. 2007

Metall Mater Trans A

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It is shown that the short pulse durations (0.1-10 ns) in laser shock compression ensure a rapid decay of the pulse and quenching of the shocked sample in times that are orders of magnitude lower than in conventional explosively driven plate impact experiments. Thus, laser compression, by virtue of a much more rapid cooling, enables the retention of a deformation structure closer to the one existing during shock. The smaller pulse length also decreases the propensity for localization.

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Section: Tem Of Pure Coppermentioning

confidence: 99%

Section: Effect Of Pressure Decay On Mechanical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Deformation Substructures and Their Transitions in Laser Shock–Compressed Copper-Aluminum Alloys

Meyers

Schneider

Jarmakani

et al. 2007

Metall Mater Trans A

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“…However, other factors can dominate the mechanical response. For example, a reduction in stacking fault energy in fcc metals (either in a pure metal like silver [4], or via alloying in copper alloys [5]) can result in a shift in deformation mechanism from dislocation formation to twinning, whilst in bcc metals, a reduction in Peierls stress (such as in niobium) can result in a much higher proportion of the deformation being accommodated by dislocation generation rather than motion of pre-existing dislocations [6]. The effects of increasing dislocation density before shock loading has been much less studied, although a series of papers have reported on the role of dislocation density on tantalum [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Contrasting the effects of cold rolling on the shock response of typical face centred cubic and body centred cubic metals

Millett¹,

Higgins

Whiteman³

et al. 2018

AIP Conference Proceedings

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Abstract. The response of metals to shock loading is affected by a number of factors, including the unit cell and properties that affect the motion and generation of dislocations such as stacking fault energy and the Peierls stress. In an effort to increase the understanding in this area, we have chosen to investigate the response of two near ideal materials; copper as an fcc and tantalum as a bcc. We have also investigated each material in both an annealed and cold worked to 50% reduction in thickness in an attempt to understand how differences in dislocation density affect response. Measurements have been made using standard diagnostics, including stress gauges and Photonic Doppler Velocimetry as well as analysis of the shocked microstructural and mechanical response through one-dimensional recovery.

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“…В [1] было исследовано изменение плотности дисло-каций в зависимости от γ ДУ при ударных нагружениях меди и сплавов Cu-Al с размером зерна 50 мкм. Для срав-нения были проведены также испытания на сжатие со скоростью 5 · 10 -4 с -1 до степени деформации ε ист = 0.25.…”

Section: Introductionunclassified

Effect of stacking-fault energy on the accumulation of dislocations during plastic deformation of copper-based polycrystalline alloys

Конева¹,

Trishkina²,

Potekaev³

2017

LoM

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The transmission electron microscopy was used to investigate the dislocation structure and accumulation of dislocations during the plastic deformation in Cu-Al and Cu-Mn polycrystalline FCC solid solutions. Al content in Cu-Al alloys varied from 0.5 to 14 at.%, and Mn content in Cu-Mn alloys varied from 0.4 to 25 аt.%. The alloy samples with the grain size ranging from 20 to 240 μm were studied., They were subjected to tensile deformation at the strain rate of 2 · 10 -2 s -1 at temperatures 293 -673 K. Observations of the structure on thin foils were carried out on electron microscopes at 125 kV accelerating voltage. For different strains, the scalar dislocation density and other parameters of the defect structure such as the size of the dislocation cells, density of microtwins etc. were measured. The results show that the increased content of Mn and Al in alloys is accompanied by an increase in the dislocation density. In Cu-Al alloys the dislocation density depends on the stacking fault energy. With its decrease, the density of dislocations increases. An explanation of this behavior is given. In Cu-Mn alloys the increased Mn content does not modify the stacking fault energy, while in Cu-Al alloys the dislocation density increases with the increase in the deformation temperature due to the temperature effect on the stacking fault energy. In Cu-Mn alloys, the temperature reduces the dislocation density. The resistance to deformation both in Cu-Al and Cu-Mn alloys decreases with the temperature increase. Physical causes of the absence of the temperature anomaly of mechanical properties in Cu-Al alloys are discussed. -2 с -1 до разрушения при температурах 293 -673 K. Структура де-формированных до различных степеней деформации образцов изучали на фольгах на электронных микроскопах при ускоряющем напряжении 125 кВ. Для разных степеней деформации измерялась скалярная плотность дислока-ций и некоторые другие параметры дефектной структуры (размер дислокационных ячеек, плотность микродвойни-ков и др.). В результате исследований установлено, что увеличение содержания Mn и Al в сплавах сопровождается увеличением плотности дислокаций. При этом в сплавах Cu-Al плотность дислокаций зависит от энергии дефекта упаковки γ ДУ при снижении γ ДУ плотность дислокаций увеличивается. Дано объяснение этого явления. В сплавах Cu-Mn увеличение содержания Mn не изменяет γ ДУ , соответственно этот эффект отсутствует. В сплавах Cu-Al обна-ружено увеличение плотности дислокаций с повышением температуры деформации, что связано с влиянием тем-пературы на величину γ ДУ . В сплавах Cu-Mn увеличение температуры деформации снижает плотность дислокаций. Сопротивление деформированию как в сплавах Cu-Al, так и в сплавах с Mn с повышением температуры снижается. Обсуждаются физические причины отсутствия температурной аномалии механических свойств в сплавах Cu-Al.Ключевые слова: сплавы, деформация, плотность дислокаций, энергия дефекта упаковки.

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The variation of dislocation density as a function of the stacking fault energy in shock-deformed FCC materials

Cited by 73 publications

References 20 publications

Deformation Substructures and Their Transitions in Laser Shock–Compressed Copper-Aluminum Alloys

Deformation Substructures and Their Transitions in Laser Shock–Compressed Copper-Aluminum Alloys

Contrasting the effects of cold rolling on the shock response of typical face centred cubic and body centred cubic metals

Effect of stacking-fault energy on the accumulation of dislocations during plastic deformation of copper-based polycrystalline alloys

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