Spherical indentation hardness of shape memory alloys

Yan, Wenyi; Sun, Qingping; Liu, Hong-Yuan

doi:10.1016/j.msea.2006.03.046

Cited by 29 publications

(17 citation statements)

References 28 publications

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“…An advanced constitutive model including interfacial energy is required to accurately predict the interface area. In addition, the experimental observation of depth dependence of the spherical hardness of SMAs agrees with the previously published numerical results, 23 where the interfacial energy was not involved. This fact further confirms the hypothesis that the contribution of interfacial energy to the spherical hardness is not as dominant as to the sharp indentation hardness.…”

Section: A Contribution Of Interfacial Energysupporting

confidence: 90%

On anomalous depth-dependency of the hardness of NiTi shape memory alloys in spherical nanoindentation

2013

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Section: A Contribution Of Interfacial Energysupporting

confidence: 90%

On anomalous depth-dependency of the hardness of NiTi shape memory alloys in spherical nanoindentation

2013

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“…Casals and Forest [128] investigated the anisotropy in the contact response of FCC and HCP (hexagonal closest-packed) single crystal via simulating spherical indentation experiments of bulk Subsequently, FEM nanoindentation simulation of thin films [107][108][109][110], stress distribution [111][112][113], hardness [114][115][116], friction effects [109,117], brittle cracking behaviour [118][119][120] and coatings [121,122] were extensively developed.…”

Section: Crystal Plasticity Fem Simulationmentioning

confidence: 99%

Progress in Indentation Study of Materials via Both Experimental and Numerical Methods

et al. 2017

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Indentation as a method to characterize materials has a history of more than 117 years. However, to date, it is still the most popular way to measure the mechanical properties of various materials at microscale and nanoscale. This review summarizes the background and the basic principle of processing by indentation. It is demonstrated that indentation is an effective and efficient method to identify mechanical properties, such as hardness, Young's modulus, etc., of materials at smaller scale, when the traditional tensile tests could not be applied. The review also describes indentation process via both experimental tests and numerical modelling in recent studies.

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“…This was related to larger strain gradients (and therefore more superimposed dislocation plasticity) below a Berkovich indenter tip. Most nanoindentation studies focused on the characterization of binary NiTi [5,7,[10][11][12][13]. In contrast, only little attention was paid to ternary alloys, even though these alloys offer alternative phase transformation sequences and allow to optimize transformation temperatures [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Thermomechanical Constraints on Pseudoelasticity During Nanoindentation of Binary and Ternary NiTi(Fe) Alloys

Pfetzing¹,

Wagner²,

Frenzel³

et al. 2013

Icomat

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Nanoindentation is a promising method for the characterization of thermomechanical properties of shape memory alloys. However, interpretation of the resulting data sets (usually force-indentation depth plots) is not straight-forward because indentation experiments are associated with complex strain states below the indenter tips. Moreover, as dislocation mediated plasticity usually occurs even for small indentation loads, pseudoelastic deformation is not fully reversible. In this paper, we present results of systematic nanoindentation studies on two pseudoelastic shape memory alloys (binary NiTi with Ni-rich precipitates and ternary NiTiFe) that both exhibit a distinct R-phase transformation. We discuss the effect of indenter tip radii and maximum indentation depths on remnant depth ratios. Special emphasis is placed on the effect of testing temperature: Maximum shape recovery occurs at temperatures as close as possible to the R-phase transformation start temperature R §, even when this requires that testing is performed below the austenite finish temperature Af. This result is in contrast to macroscopic pseudoelasticity, where testing well above A f results in the full reverse transformation and hence optimizes shape recovery. Our findings are discussed considering the effect of Ni-rich precipitates on yield strength and thermomechanical constraints which limit the pseudoelastic temperature window during nanoindentation testing.

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Spherical indentation hardness of shape memory alloys

Cited by 29 publications

References 28 publications

On anomalous depth-dependency of the hardness of NiTi shape memory alloys in spherical nanoindentation

On anomalous depth-dependency of the hardness of NiTi shape memory alloys in spherical nanoindentation

Progress in Indentation Study of Materials via Both Experimental and Numerical Methods

Thermomechanical Constraints on Pseudoelasticity During Nanoindentation of Binary and Ternary NiTi(Fe) Alloys

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