Types M�it-7 and M�it-7 hardness testers

Markovets, M. P.; Piksin, Yu. I.; Plotnikov, V. P.

doi:10.1007/bf00812559

Cited by 3 publications

(5 citation statements)

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“…Values of δ A and δ H were obtained under the same load for each material. The characteristic δ A was calculated by (6), and δ H was computed using (1), ( 2) and ( 5) [26].…”

Section: Plasticity Characteristic In Instrumented Indentationmentioning

confidence: 99%

“…A method of hardness and microhardness measurement with a rigid indenter is effectively applied in various laboratories of materials science. Recent investigations [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] allowed an essential expansion of the possibilities of this method and it is now possible to determine by indentation, besides hardness, a complex of mechanical characteristics: flow stress, fracture stress, Young's modulus, fracture toughness, etc. Before our paper [3] was published some attempts also were made to define plasticity characteristics [6].…”

Section: Introductionmentioning

confidence: 99%

“…Recent investigations [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] allowed an essential expansion of the possibilities of this method and it is now possible to determine by indentation, besides hardness, a complex of mechanical characteristics: flow stress, fracture stress, Young's modulus, fracture toughness, etc. Before our paper [3] was published some attempts also were made to define plasticity characteristics [6]. However, the attempt to determine standard ductility characteristics for the tensile test (elongation to fracture δ and cross area reduction ψ) by indentation had insufficient physical grounds and was not successful.…”

Section: Introductionmentioning

confidence: 99%

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Plasticity characteristic obtained by indentation

Milman¹

2008

J. Phys. D: Appl. Phys.

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A dimensionless parameter δH = εp/εt (where εp and εt are the average values of plastic and total deformation of material on the contact area indenter–specimen) may be used as the plasticity characteristic of materials, which made it possible to characterize the plasticity of materials that are brittle in standard mechanical tests. δH may be calculated from the values of microhardness HM, Young's modulus E and Poisson's ratio ν. In instrumented indentation the plasticity characteristic δA = Ap/At (Ap and At are the work of plastic and total deformation during indentation) may be calculated. δA ≈ δH for materials with δH > 0.5, i.e. for all metals and the majority of ceramic materials. In this case, the theoretical equation δA ≈ δH = 1–10.2 · (1 − ν − 2ν2)(HM/E) is satisfied in experiments with the Berkovich indenter. The influence of the temperature and structural parameters (dislocation density and grain size including nanostructured materials) on δH is discussed.

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“…Values of δ A and δ H were obtained under the same load for each material. The characteristic δ A was calculated by (6), and δ H was computed using (1), ( 2) and ( 5) [26].…”

Section: Plasticity Characteristic In Instrumented Indentationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Plasticity characteristic obtained by indentation

Milman¹

2008

J. Phys. D: Appl. Phys.

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“…0 ≈ α M.P. Markovets [3] determines the average ratio of deformation of sphere indentation into the plane by the equation…”

Section: The Corresponding Tension Is Described By Equationmentioning

confidence: 99%

The Relationship between the Deformation of Spherical Indentation and Tensile Deformation

Ogar

Gorokhov

2016

KEM

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The paper is devoted to the definition of the deformation during indentation of the sphere and its relationship with the tensile deformation. Proposed by different authors methods of determining the deformation of the contact are considered. The results of their researches may vary significantly. It is shown that in the last decade to determine the deformation, the finite element analysis taking into account the "sink-in/pile-up", i.e. an elastic sinking in and plastic piling up of the material on the edges of the indent during the indentation process is widely used. The purpose of this research is to determine the relationship between tension deformation and sphere indentation deformation with taking into account the last achievements in the field of finite-element modeling of elastic-plastic sphere indentation. It is considered two methods of determining of deformation. One uses the equation proposed by S.I. Bulychev, in which the Mayer’s index is determined from the results of finite element analysis. The second method use the energy concept of hardness. It is based on the assumption that within the range of uniform deformation during uniaxial tension and during sphere indentation, the same energy is consumed to the plastic displacement of the part of the material volume out of limits of initial volume. They have close results. The corresponding graphic relations are shown.

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“…The relationship between the microhard ness and other mechanical properties should be noted. In fact, indentation and scratch hardness tests can pro vide almost the same information about the properties of metals as tension does [3]. We do not know of studies on the influence of the production technique of an ingot on its Young's modulus, plasticity, and the 0.2 offset yield strength of its phases.…”

Section: Introductionmentioning

confidence: 99%

Measurement of young’s modulus and hardness of Al-50 wt % Sn alloy phases using nanoindentation

Чикова

Шишкина

Konstantinov

2013

Phys. Metals Metallogr.

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Abstract-The nanoindentation method was used to measure the Young's modulus and hardness of the phases of the alloy Al-50 wt % Sn: α aluminum and eutectic. Samples are obtained in different ways, i.e., traditionally via the transition of the melt into a homogeneous structural state by heating to a certain temper ature, followed by cooling using the cooling rate greater by the order than that of the traditional method and via the addition of 0.06 wt % Ti and 1 wt % Zr to the binary alloy. It has been found that the most significant effect of the Al-50 wt % Sn phases on the Young's modulus is the transition of the melt into a homogeneous structural state and the introduction of Zr into the melt. As part of the mathematical theory of elasticity, a numerical evaluation of the interfacial pressure that arises due to the difference between Young's modulus of α aluminum and eutectic has been performed. The calculation has showed that the extra pressure is nine times less for the alloy formed through the transition of the melt into a homogeneous structural state than for the alloy produced via a traditional way.

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Types M�it-7 and M�it-7 hardness testers

Cited by 3 publications

References 0 publications

Plasticity characteristic obtained by indentation

Plasticity characteristic obtained by indentation

The Relationship between the Deformation of Spherical Indentation and Tensile Deformation

Measurement of young’s modulus and hardness of Al-50 wt % Sn alloy phases using nanoindentation

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