Journal ArticleDOI
Activation parameters for deformation of ultrafine-grained aluminium as determined by indentation strain rate jumps at elevated temperature
TLDR
In this paper, the hardness and strain rate sensitivity of ultrafine-grained (UFG) aluminium were examined as a function of temperature using in situ strain rate jump indentation in a SEM at temperatures up to 250 °C.Abstract:
The hardness and strain rate sensitivity of ultrafine-grained (UFG) aluminium was examined as a function of temperature using in situ strain rate jump indentation in a SEM at temperatures up to 250 °C. Measured strain rate sensitivities were in good agreement with earlier bulk compression measurements. Activation energies and volumes for deformation were extracted and discussed. Transitions in the deformation mechanism are observed at lower temperatures for smaller grain sizes.read more
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Mechanical behavior of high-entropy alloys
TL;DR: In this article, the authors present a comprehensive, critical review of the mechanical behavior of high-entropy alloys and some closely related topics, including thermodynamics and kinetics.
Journal ArticleDOI
Overview on micro- and nanomechanical testing: New insights in interface plasticity and fracture at small length scales
TL;DR: In this paper, the challenges of instrumented micro-and nanomechanical testing at elevated temperature are summarized and a special focus is laid on the pitfalls of micro-compression testing with its stringent boundary conditions often hampering reliable experiments.
Journal ArticleDOI
High temperature nanoindentation: The state of the art and future challenges
TL;DR: In this paper, thermal management and measurement techniques necessary to achieve stable indentation testing at temperatures up to ∼800 °C with thermal drift levels similar to those present at room temperature are discussed, with particular emphasis on systems featuring independent heating of both the indenter and sample.
Journal ArticleDOI
Nanocrystalline High-Entropy Alloys: A New Paradigm in High-Temperature Strength and Stability
TL;DR: It is shown that a nanocrystalline high-entropy alloy (HEA) retains an extraordinarily high yield strength over 5 GPa up to 600 °C, 1 order of magnitude higher than that of its coarse-grained form and 5 times higher thanThat of its single-crystalline equivalent.
Journal ArticleDOI
Dynamic nanoindentation testing for studying thermally activated processes from single to nanocrystalline metals
Karsten Durst,Verena Maier +1 more
TL;DR: In this article, a small overview is given on thermally activated dislocation mechanism and how indentation data from pointed indenters can be interpreted in terms of uniaxial macroscopic testing, which requires the use of the indentation strain rate as introduced by Lucas and Oliver as well as the concepts of Taylor hardening together with Johnson expanding cavity model.
References
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Journal ArticleDOI
An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments
Warren C. Oliver,George M. Pharr +1 more
TL;DR: In this paper, the authors used a Berkovich indenter to determine hardness and elastic modulus from indentation load-displacement data, and showed that the curve of the curve is not linear, even in the initial stages of the unloading process.
Book
Deformation-Mechanism Maps: The Plasticity and Creep of Metals and Ceramics
H.J. Frost,Michael F. Ashby +1 more
TL;DR: Deformation-mechanism maps: the plasticity and creep of metals and ceramics as discussed by the authors, Deformation-Mechanism Maps of metal deformation: the deformation and the creep of metal and ceramic.
Journal ArticleDOI
Paradox of strength and ductility in metals processed by severe plastic deformation
TL;DR: In this paper, a combination of high strength and high ductility produced in metals subject to severe plastic deformation (SPD) was shown to enable deformation by newmechanisms.
Journal ArticleDOI
Theory of the tensile test
TL;DR: In this paper, the tensile test is re-examined with special attention to the influence of strain rate sensitivity of the flow stress, and explicit formulae are deduced for the measured variables of the test in terms of the phenomenological parameters of the material.
Journal ArticleDOI
Mechanical behavior of crystalline solids at elevated temperature
Oleg D. Sherby,Peter M. Burke +1 more
TL;DR: In this paper, the mechanical behavior of crystalline solids at elevated temperatures is discussed, including the creep properties of metals, solid solutions and two phase alloys, and the properties of two-phase alloys.
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An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments
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