Creep behavior of copper at intermediate temperatures—I. Mechanical characteristics

Raj, S. V.; Langdon, Terence G.

doi:10.1016/0001-6160(89)90011-4

Cited by 113 publications

(53 citation statements)

References 27 publications

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“…The V Ã value varies from 760 to 79b 3 in Mg 7) and from 136 to 4.9b 3 in the ZK60 alloy. Functionally, these dependencies are typical of many materials 2,[10][11][12] in spite of the values of V Ã estimated for Mg are somewhat lower than that obtained in other studies. 2,11,13) In the same time, some unique features become evident on the curves for Mg and for the ZK60 alloy.…”

Section: Activation Volume For Plastic Deformationcontrasting

confidence: 73%

“…Raj and Langdon 12,25) showed that this phenomenon reflects more complex changes in deformation mechanisms. It cannot be explained in terms of the simple transition from volume diffusion as the process controlling deformation to pipe diffusion; (2) direct topographic examination 4,6,26,27) attests to the important role played by cross-slip in the plastic deformation of the Mg alloy at intermediate and high temperatures.…”

Section: An Examination Of Deformation Mechanisms In Magnesium Alloymentioning

confidence: 99%

“…(i) the stress exponent does not obey the rule n ¼ n þ 2 12) in passing from the high-temperature to the intermediate-temperature range; (ii) the temperature dependence of activation energy is not typical of this process, namely, one can hardly observe two plateaus in which the activation energy for deformation coincides with Q for pipe and lattice diffusion, respectively. 8,18) The activation energy for deformation depends on the normalized stress in a complex nonlinear manner (Fig.…”

Section: An Examination Of Deformation Mechanisms Inmentioning

confidence: 99%

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Deformation Behavior and Controlling Mechanisms for Plastic Flow of Magnesium and Magnesium Alloy

2003

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Deformation behavior of pure Mg and Mg alloy were studied in the temperature range of 423 to 773 K and at strain rates of 10 À4 -10 À2 s À1 . Three temperature regions can be categorized both in Mg and Mg alloy. The deformation behavior in Mg can be described by an exponantional law at temperatures below 523 K. At the higher temperatures a power law of deformation is valid with the stress exponent close to n ¼ 7 in the intermediate (523-623 K) and 2.2 in the high (673-773 K) temperature ranges. The alloying of Mg with elements such as Zn changes the phenomenology of plastic deformation. An exponantional law is operative at temperatures below 473 K. At above 473 K deformation obeys a power law. The stress exponent is close to n ¼ 7 at intermediate temperatures (473-523 K) and 5 in the high temperature range. An analysis of experimental results shows that alloying changes the controlling mechanisms of plastic deformation and so leads to different deformation behavior in pure Mg and Mg alloy that can be associated with decreasing stacking fault energy (SFE) in Mg alloy. The effect of SFE on the mechanisms of plastic deformation when alloying Mg is discussed.

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Section: Activation Volume For Plastic Deformationcontrasting

confidence: 73%

Section: An Examination Of Deformation Mechanisms In Magnesium Alloymentioning

confidence: 99%

Section: An Examination Of Deformation Mechanisms Inmentioning

confidence: 99%

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Deformation Behavior and Controlling Mechanisms for Plastic Flow of Magnesium and Magnesium Alloy

2003

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“…This assumption was supported by the experimental results that experimental data of logarithmic SSCR versus sustained stress seemed to be approximately linear (Cao et al, 2012;Elmustafa and Stone, 2002;Raj and Langdon, 1989;Wang et al, 2009aWang et al, , 2009bWang et al, , 2011. On the other hand, a pure power-law relation of ε σ ∝ ss n was also assumed in the one-temperature approach.…”

mentioning

confidence: 76%

“…Then, one can obtain the activation volume from the experimentally determined relationship between nominal activation energy and sustained stress. In the literature, however, some researchers were trying to determine the activation volume from creep tests under various sustained stresses at only one temperature, usually room temperature (RT) (Cao et al, 2012;Elmustafa and Stone, 2002;Raj and Langdon, 1989;Wang et al, 2009aWang et al, , 2009bWang et al, , 2011. This approach is called one-temperature approach hereafter.…”

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confidence: 99%

Time, stress, and temperature-dependent deformation in nanostructured copper: Stress relaxation tests and simulations

Yang

Wang

et al. 2016

Acta Materialia

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a b s t r a c tIn the present work, we performed experiments, atomistic simulations, and high-resolution electron microscopy (HREM) to study the creep behaviors of the nanotwinned (nt) and nanograined (ng) copper at temperatures of 22°C (RT), 40°C, 50°C, 60°C, and 70°C. The experimental data at various temperatures and different sustained stress levels provide sufficient information, which allows one to extract the deformation parameters reliably. The determined activation parameters and microscopic observations indicate transition of creep mechanisms with variation in stress level in the nt-Cu, i.e., from the Coble creep to the twin boundary (TB) migration and eventually to the perfect dislocation nucleation and activities. The experimental and simulation results imply that nanotwinning could be an effective approach to enhance the creep resistance of twin-free ng-Cu. The experimental creep results further verify the newly developed formula (Yang et al., 2016) that describes the time-, stress-, and temperature-dependent plastic deformation in polycrystalline copper.

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Creep Behavior of Bulk Nanostructured Materials – Time‐Dependent Deformation and Deformation Kinetics

Blum

Eisenlohr

Sklenička

2009

Bulk Nanostructured Materials

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Creep behavior of copper at intermediate temperatures—I. Mechanical characteristics

Cited by 113 publications

References 27 publications

Deformation Behavior and Controlling Mechanisms for Plastic Flow of Magnesium and Magnesium Alloy

Deformation Behavior and Controlling Mechanisms for Plastic Flow of Magnesium and Magnesium Alloy

Time, stress, and temperature-dependent deformation in nanostructured copper: Stress relaxation tests and simulations

Creep Behavior of Bulk Nanostructured Materials – Time‐Dependent Deformation and Deformation Kinetics

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