Study of the influence of the structural grain size on the mechanical properties of technical materials

Harničárová, Marta; Valíček, Ján; Kušnerová, Milena; Kmec, Ján; Palková, Zuzana; Kopal, Ivan; Krmela, Ján; Panda, Anton

doi:10.1002/mawe.201800177

Cited by 8 publications

(7 citation statements)

References 10 publications

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“…The challenge is to make explicit the parameters given by the implicit Equation ( 9). The analytical solution of the extrusion process of material samples by the ECAP method is based on the newly derived equations [30][31][32] of equilibrium state ratios ( 10)- (12).…”

Section: Derivation Of Mathematical Functions For the Analytical Solu...mentioning

confidence: 99%

Structural and Mechanical Changes of AlMgSi0.5 Alloy during Extrusion by ECAP Method

et al. 2022

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SPD (several plastic deformations) methods make it possible to obtain an ultrafine-grained structure (UFG) in larger volumes of material and thus improve its mechanical properties. The presented work focuses on the structural and mechanical changes of aluminium alloy AlMgSi0.5 (EN AW 6060) during processing by repeated extrusion through the ECAP rectangular channel. After a four-pass extrusion, the samples’ microstructures were observed using an optical microscope, where refinement of the material grains was confirmed. Tensile tests determined the extrusion forces and allowed interpretation of the changes in the mechanical properties of the stressed alloy. The grain size was refined from 28.90 μm to 4.63 μm. A significant improvement in the strength of the material (by 45%) and a significant deterioration in ductility (to 60%) immediately after the first extrusion was confirmed. The third pass through the die appeared to be optimal for the chosen deformation path, while after the fourth pass, micro-cracks appeared, significantly reducing the strength of the material. Based on the measurement results, new analytical equations were formulated to predict the magnitude or intensity of the volumetric and shape deformations of the structural grain size and, in particular, the adequate increase in the strength and yield point of the material.

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Section: Derivation Of Mathematical Functions For the Analytical Solu...mentioning

confidence: 99%

Structural and Mechanical Changes of AlMgSi0.5 Alloy during Extrusion by ECAP Method

et al. 2022

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“…Based on the authors’ relatively extensive experience and evidence in the study of the concerned area [ 35 , 36 , 37 , 38 ], a new method of predicting the structural and mechanical change of materials during extrusion by the method of multiple plastic deformations was developed.…”

Section: Methodsmentioning

confidence: 99%

A New Method of Predicting the Structural and Mechanical Change of Materials during Extrusion by the Method of Multiple Plastic Deformations

et al. 2021

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The formulation of the Hall–Petch relationship in the early 1950s has raised immense interest in studying the influence of the grain size of solid materials on their properties. Grain refinement can be achieved through extreme deformation. In the presented study, Equal-Channel Angular Pressing (ECAP) was successfully applied to produce an ultrafine-grained microstructure in a pure commercial Cu of 99.9 wt%. Samples were processed by ECAP at 21 °C for six passes via route A. A new equation of equilibrium that allows the exact determination of the number of extrusions and other technological parameters required to achieve the desired final grain size has been developed. The presented research also deals, in a relatively detailed and comparative way, with the use of ultrasound. In this context, a very close correlation between the process functions of extrusion and the speed of longitudinal ultrasonic waves was confirmed.

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“…Alternatively, the signals or their root mean square (RMS) values detected by various types of strain gauges, acoustic-emission signals and their root mean square or signals from optical surface roughness measurements, gamma-metric signals, etc., can be interpreted in the developed manner. Thus, various methods can be used for the non-destructive detection of a surface physical parameter that is functionally related to one of the most important material constants, such as Young's modulus E mat (MPa), tensile stress σ T , compressive stress σ D or surface roughness Ra [8,9].…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Express diagnostics of stress‐strain states of materials

Harničárová

Valíček

Duer

et al. 2022

Materialwissenschaft Werkst

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The presented paper deals with the development of a new method for determining static and dynamic values of mechanical equivalents from ultrasonic wave measurements. The aim of the new method of determination of mechanical equivalents of materials based on ultrasonic wave measurements is the development of a new algorithm for implementation in instruments for express non‐destructive diagnostics of elastic‐strength and defectoscopic parameters and instantaneous stress‐strain state of the material, including theoretical construction of the σ‐ϵ load diagram and other analyses based on ultrasonic measurements. The proposed method is characterized by a new theoretical basis for determining the equivalents of physical‐mechanical and defectoscopic characteristics, i. e., the equivalents of the so‐called tabular values of materials, and, in addition, it will also expressively evaluate their time evolution changes due to the structural‐strain alteration of the material during the reshaping process under technological and functional stresses.

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Study of the influence of the structural grain size on the mechanical properties of technical materials

Cited by 8 publications

References 10 publications

Structural and Mechanical Changes of AlMgSi0.5 Alloy during Extrusion by ECAP Method

Structural and Mechanical Changes of AlMgSi0.5 Alloy during Extrusion by ECAP Method

A New Method of Predicting the Structural and Mechanical Change of Materials during Extrusion by the Method of Multiple Plastic Deformations

Express diagnostics of stress‐strain states of materials

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