Grain boundary sliding in copper and its relation to cavity formation during creep

Sandström, Rolf; Wu, Rong-Tsun; Hagström, Joacim

doi:10.1016/j.msea.2015.10.100

Cited by 26 publications

(14 citation statements)

References 36 publications

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“…However, nucleation can take place at the sub-boundary junctions. This has been verified to be thermodynamically feasible [50]. According to the double ledge model, the nucleation rate of cavities is proportional to the creep strain rate, which is in full agreement with experimental data, for example, for austenitic stainless steels [9].…”

Section: Cavitation Modelsupporting

confidence: 82%

“…It is very difficult to explain the observed stress and strain dependences of cavity nucleation unless GBS is the dominating mechanism [9]. Experiments for GBS demonstrate that about the same value is obtained for Cu with different experimental techniques from 125 to 600°C at different strain rates [50]. It demonstrates that C s is approximately constant over a wide range of conditions.…”

Section: Cavitation Modelmentioning

confidence: 91%

“…The ratio of the GBS displacement rate to the strain rate is a constant, denoted as C s . The value of C s is approximately 50 lm for copper [50]. It is very well established that the number of nucleated cavities is proportional to the creep strain.…”

Section: Cavitation Modelmentioning

confidence: 94%

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Basic modelling of tertiary creep of copper

Sui

Sandström

2018

J Mater Sci

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Mechanisms that are associated with acceleration of the creep rate in the tertiary stage such as microstructure degradation, cavitation, necking instability and recovery have been known for a long time. Numerous empirical models for tertiary creep exist in the literature, not least to describe the development of creep damage, which is vital for understanding creep rupture. Unfortunately, these models almost invariably involve parameters that are not accurately known and have to be fitted to experimental data. Basic models that take all the relevant mechanisms into account which makes them predictive have been missing. Only recently, quantitative basic models have been developed for the recovery of the dislocation structure during tertiary creep and for the formation and growth of creep cavities. These models are employed in the present paper to compute the creep strain versus time curves for copper including tertiary creep without the use of any adjustable parameters. A satisfactory representation of observed tertiary creep has been achieved. In addition, the role of necking is analysed with both uniaxial and multiaxial methods.

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Section: Cavitation Modelsupporting

confidence: 82%

Section: Cavitation Modelmentioning

confidence: 91%

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Basic modelling of tertiary creep of copper

Sui

Sandström

2018

J Mater Sci

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“…(2) was first observed by Needham and Figure 1. Illustration of grain boundary sliding (GBS) for a copper specimen that has been exposed to 3.3% creep strain during 307 h at 125°C [19]. The grain boundary lies in the southwest-northeast direction.…”

Section: Grain Boundary Slidingmentioning

confidence: 99%

“…[31,32] a Norton equation for the creep strain rate was considered Figure 2. Observed displacements at grain boundaries in copper as a function of strain [19]. Data from Refs.…”

Section: Study Of Grain Boundary Charactermentioning

confidence: 99%

Survey of Creep Cavitation in fcc Metals

Sandström¹,

He²

2017

Study of Grain Boundary Character

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Cavitation plays an important role in plants operating at high temperatures since the cavitation controls the creep failure of engineering alloys. In the past it has been difficult to predict the cavitation behaviour with the help of basic models, since critical models have been missing. Recently new models have been formulated for grain boundary sliding, cavity nucleation and cavity growth to fill this gap. These models are reviewed in this chapter. It is shown that the new models can quantitatively predict cavitation for austenitic stainless steels, where detailed experimental information is available.

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The Role of Fundamental Modeling

Sandström

2024

Springer Series in Materials Science

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The difference between empirical and basic modeling and its significance is explained. The types of basic models that have been possible to develop and that are describe in the book are summarized. The starting point is a basic model for the dislocation density that is used to derive expression for tensile and creep properties. It is described how the accuracy of the basic models can be verified. For the creep models it is described that they are applicable over a wide range of temperatures and stresses that is of great value to identify operating mechanisms.

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Grain boundary sliding in copper and its relation to cavity formation during creep

Cited by 26 publications

References 36 publications

Basic modelling of tertiary creep of copper

Basic modelling of tertiary creep of copper

Survey of Creep Cavitation in fcc Metals

The Role of Fundamental Modeling

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