Plasticity of Materials Determined by the Indentation Method

Milman, Yu.V.; Chugunova, S. І.; Goncharova, І. V.; A., Golubenko, A.

doi:10.15407/ufm.19.03.271

Cited by 37 publications

(12 citation statements)

References 58 publications

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“…In Table 2 , Table 3 , Table 4 and Table 5 , the experimental average data, and the empirical values of stainless steel, copper alloy, aluminum alloy, and copper–chromium–zirconium alloy, used to implement the calculation models of indentation hardness H IT , indentation modulus E IT indentation creep C IT , and indentation work η IT from HV standard tests, were collected. According to [ 52 , 53 ], plasticity characteristic δ H , which is a dimensionless parameter defined as the ratio between the plastic ( h p in this specific case) and the total deformation ( h MAX ) during indentation, namely δ H = h p / h MAX , is also reported.…”

Section: Resultsmentioning

confidence: 99%

“…Nevertheless, other parameters can be used to evaluate the reliability of the experimental results by calculating the relationship between the energy dissipated during the indentation and the ratio of hardness H IT to reduced elastic modulus E r [ 56 ] and from the plasticity characteristic values δ H [ 52 ]. As observed, this energy ratio allows determining the hardness, elastic modulus, and contact area and circumventing the effects of pile-up and sink-in.…”

Section: Discussionmentioning

confidence: 99%

“…As previously stated, plasticity characteristic values δ H are also reported. Experimental values change as a function of the tested material, ranging, as an average, between 0.85 and 0.94 for metals and alloys as found in [ 52 , 53 ], and are constants as a function of the applied load. Theoretical values of δ H were also calculated by combining the Poisson’s ratio ν s , Young’s modulus E s ( Table 1 ), and Vickers hardness HV , as following:

…”

Section: Discussionmentioning

confidence: 99%

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Indentation Modulus, Indentation Work and Creep of Metals and Alloys at the Macro-Scale Level: Experimental Insights into the Use of a Primary Vickers Hardness Standard Machine

et al. 2021

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In this work, the experimental method and the calculation model for the determination of indentation moduli, indentation work, and indentation creep of metallic materials, by means of macroscale-level forces provided by a primary hardness standard machine at the National Institute of Metrological Research (INRIM) at the at room temperature were described. Indentation moduli were accurately determined from measurements of indentation load, displacement, contact stiffness and hardness indentation imaging and from the slope of the indentation unloading curve by applying the Doerner-Nix linear model; indentation work, representing the mechanical work spent during the force application of the indentation procedure, was determined by calculating the areas under the loading–unloading indentation curve, through fitting experimental data with a polynomial law. Measurements were performed with a pyramidal indenter (Vickers test). The applied force was provided by a deadweight machine, and the related displacement was measured by a laser interferometric system. Applied forces and the occurring indentation depths were simultaneously measured: the resulting loading–unloading indentation curve was achieved. Illustrative tests were performed on metals and alloy samples. Discussion and comments on the suitability of the proposed method and analysis were reported.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

…”

Section: Discussionmentioning

confidence: 99%

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Indentation Modulus, Indentation Work and Creep of Metals and Alloys at the Macro-Scale Level: Experimental Insights into the Use of a Primary Vickers Hardness Standard Machine

et al. 2021

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“…Although in the cast and forged alloy, the work hardening effect was not discussed based on the applied stress level, in the aged alloy, this effect was observed with the data obtained by multi hardness measurements along the crack paths on cross-sections of fatigue failed alloys (Figure 6). As suggested by Milman et al (2018), plasticity of materials could be characterized by the diamond pyramidal indenters at constant load and by instrumental nanoindentation; thus, the work hardening effect can be determined by both of these methods. In the present study, microhardness tests revealed adequate data and there was no need for nanoindentation test.…”

Section: Mechanical Characterizationmentioning

confidence: 99%

Fatigue behavior of precipitation strengthened Cu–Ni–Si alloy modified by Cr and Zr addition

Atapek

Pantelakis

Polat

et al. 2020

IJSI

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Purpose The purpose of this paper is to investigate the fatigue behavior of precipitation-strengthened Cu‒2.55Ni‒0.55Si alloy, modified by the addition of 0.25 Cr and 0.25 Zr (wt%), using mechanical and fractographical studies to reveal the effect of microstructural features on the fracture. Design/methodology/approach For strengthening, cast and hot forged alloy was subjected to solution annealing at 900°C for 60 min, followed by quenching in water and then aging at 490°C for 180 min. Precipitation-hardened alloy was exposed to fatigue tests at R=−1 and different stress levels. All fracture surfaces were examined within the frame of fractographical analysis. Findings Fine Ni-rich silicides responsible for the precipitation strengthening were observed within the matrix and their interactions with the dislocations at lower stress level resulted in localized shearing and fine striations. Although, by the addition of Cr and Zr, the matrix consisted of hard Ni, Zr-rich and Cr-rich silicides, these precipitates adversely affected the fatigue behavior acting as nucleation sites for cracks. Originality/value These findings contribute to the present knowledge by revealing the effect of microstructural features on the mechanical behavior of precipitation-hardened Cu‒Ni‒Si alloy modified by Cr and Zr addition.

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“…2, b, обозначено символом • • •), и в ∼ 2 раза большей, чем у Ti−Ni−Ta ПС (рис.2, b, кривая 2). Следует отметить, что значения δ для Ti−Ni−Ta−Si ПС согласуются со значениями этого параметра для объемных металлических стекол на основе Ti[13].…”

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Механические свойства поверхностных Ti-Ni-Ta- и Ti-Ni-Ta-Si-сплавов, синтезированных на подложках из никелида титана

Дьяченко¹,

Meisner²,

Шугуров³

et al. 2021

Журнал Технической Физики

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The physical-mechanical properties of Ti-Ni-Ta and Ti-Ni-Ta-Si-based surface alloys of ~1 μm thickness synthesized on the NiTi substrates by the additive thin-film electron beam method were investigated. The effect of these surface alloys on the functional properties of the composite systems [Ti-Ni-Ta surface alloy/TiNi substrate] and [Ti-Ni-Ta-Si surface alloy/TiNi substrate] was explored. It was established that Ti-Ni-Ta-Si based surface alloy with an amorphous structure is characterized by higher gradients of hardness and Young’s modulus in comparison with Ti-Ni-Ta based surface alloy, and has an increased by ~10% and ~2 times greater plasticity compared to the initial NiTi substrate and the Ti-Ni-Ta based surface alloy, respectively. Evaluation of the shape memory effect and superelasticity of the composite systems [Ti-Ni-Ta surface alloy/TiNi substrate] and [Ti-Ni-Ta-Si surface alloy/TiNi substrate] has shown that synthesis of the surface alloy with an amorphous structure results in an almost 2-fold increase in the martensitic shear stress and a significant decrease in the stress hysteresis width compared with the untreated TiNi samples.

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Plasticity of Materials Determined by the Indentation Method

Cited by 37 publications

References 58 publications

Indentation Modulus, Indentation Work and Creep of Metals and Alloys at the Macro-Scale Level: Experimental Insights into the Use of a Primary Vickers Hardness Standard Machine

Indentation Modulus, Indentation Work and Creep of Metals and Alloys at the Macro-Scale Level: Experimental Insights into the Use of a Primary Vickers Hardness Standard Machine

Fatigue behavior of precipitation strengthened Cu–Ni–Si alloy modified by Cr and Zr addition

Механические свойства поверхностных Ti-Ni-Ta- и Ti-Ni-Ta-Si-сплавов, синтезированных на подложках из никелида титана

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