A metallographic and quantitative analysis of the influence of stacking fault energy on shock-hardening in Cu and Cu–Al alloys

Rohatgi, Aashish; Vecchio, Kenneth S.; Gray, George T.

doi:10.1016/s1359-6454(00)00335-9

Cited by 94 publications

(48 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%

“…We assume that this critical stress remains constant. The strain-rate and strain associated with a given shock pressure is calculated given by (8) and (9) (14) The point at which the horizontal line drawn at the calculated twinning stress value intersects the Z-A stress-strain curve for a given shock pressure is defined as the critical twinning stress.…”

Section: The Slip-twinning Transitionmentioning

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: The Slip-twinning Transitionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…Knezevic et al (Knezevic et al, 2010) reported that mechanical twins in AZ31 affected strain hardening and the main contribution to hardening comes from texture hardening. Rohatgi et al (Rohatgi, Vecchio, & Gray, 2001) considered that the reason that twinning retards the decrease in strain hardening rate lies in the effective grain refinement that results from twinning. However., Barnett (Barnett, 2001) provided another explanation; that reorientation of the c-axes by almost 90° has a more significant effect on the strain hardening produced by twinning with c-axis extension.…”

Section: Introductionmentioning

confidence: 99%

The cold-rolling behaviour of AZ31 tubes for fabrication of biodegradable stents

Yao-wu

Kent

Wang

et al. 2014

Journal of the Mechanical Behavior of Biomedical Materials

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The cold-rolling behaviour of AZ31 tubes for fabrication of biodegradable stents, Journal of the Mechanical Behavior of Biomedical Materials, http://dx.doi.org/10. 1016/j.jmbbm.2014.07.026 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractMg alloys are receiving considerable attention for biomedical stents due to their combination of good mechanical properties and high biodegradability. Cold rolling is necessary to process Mg alloy tubes before final drawing and fabrication of the magnesium stents. In this paper, cold-rolled tubes were subjected to a crosssectional reduction rate (ε) of up to 19.7%, and were further processed at various ratios of wall-thickness to diameter reduction (Q) from 0 to 2.24 with a constant ε of 19.7%. The results show that the cold-rolled tubes exhibited a rise in ultimate tensile strength (UTS), yield strength (YS), and a reduction in elongation as ε increased from 5.5% to 19.7%. UTS, YS and elongation decreased when Q was increased from 0 to 2.24.Mechanical twinning was observed and analysed. Extension twins increased with increasing ε and were almost saturated at an ε of 16.5%. Extension twins play an important role in determining the evolution of mechanical behaviour in the case of increasing ε, whilst contraction/double twins and secondary extension twins have a large effect on mechanical behaviour in the case of varying Q. The results indicate that the proportions and types of twins play a major role in determining the mechanical behaviour of the AZ31 tubes.

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Exploring the Effect of Aluminium Solute Atoms on Nanomechanical Properties of Copper‐Aluminium System using Nanoindentation

Verma

2024

Adv Eng Mater

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In this work, nanomechanical properties for Cu and Cu–Al (where Al = 2, 4, 6, and 8 wt%) alloys are determined using nanoindentation with Berkovich tip. Nanoindentation experiments are performed using trapezoidal load function where maximum load (Pm) varies from 1000 to 9000 μN at an equal interval of 1000 μN by maintaining equal loading and unloading rate. It is found that Cu8Al sample shows lower depth of penetration (h) at any load (P) in comparison to other samples due to more pinning of dislocations or hinderance of the dislocation movement by solute (Al) atoms during nanoindentation deformation. In addition, it is observed that the recovery is maximum for Cu8Al sample among all samples; however, this recovery is reducing with the increasing Pm for all samples. Thereafter, the elasticity and plasticity index are calculated from the area under the P–h curves, which shows that the elastic index is maximum for Cu8Al and minimum for Cu. Furthermore, the nanomechanical properties (reduced elastic modulus [Er] and hardness [H]) are reported for all samples and significant indentation size effect is observed for Cu8Al due to dislocation structure during deformation.

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A metallographic and quantitative analysis of the influence of stacking fault energy on shock-hardening in Cu and Cu–Al alloys

Cited by 94 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

The cold-rolling behaviour of AZ31 tubes for fabrication of biodegradable stents

Exploring the Effect of Aluminium Solute Atoms on Nanomechanical Properties of Copper‐Aluminium System using Nanoindentation

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