Hardness−strength relationships in fine and ultra-fine grained metals processed through constrained groove pressing

Khodabakhshi, F.; Haghshenas, M.; Eskandari, H.; Koohbor, Behrad

doi:10.1016/j.msea.2015.03.122

Cited by 128 publications

(38 citation statements)

References 51 publications

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“…The observed anomalous behavior of microhardness is in a good agreement with recent works on SPD materials [11][12][13]16] and is related to dynamic recovery and polygonization due to the adiabatic heating emerging during deformation [13,14,16].…”

Section: Tem and Ebsdsupporting

confidence: 91%

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Grain Structure and Microhardness Development of Twin-Roll Cast Aluminum Strips after Constrained Groove Pressing

et al. 2018

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Twin-roll cast aluminum strips based on EN AW 3003 alloy with a small addition of Zr and Cr further processed by constrained groove pressing (CGP) were studied in this work. Vickers microhardness measurements were used to investigate an inhomogeneous distribution of microhardness as a result of an inhomogeneous strain distribution imposed by CGP. Results are consistent with the finite element method simulations of the total equivalent plastic strain which predicts higher accumulated strain in areas close to the edges of CGP dies. Microhardness saturates after two CGP cycles due to a dynamic recovery. Electron backscatter diffraction, light optical microscopy and transmission electron microscopy were used to study grain and dislocation structure and to compare domains with higher and lower microhardness. The sample after 3 CGP cycles exhibits an unusual mechanical behavior. Domains with higher microhardness exhibit a higher degree of recovery with a lower dislocation density than domains with lower microhardness.

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Section: Tem and Ebsdsupporting

confidence: 91%

“…Up to three CGP cycles were applied for the specimen preparation. One CGP cycle consist of 4 steps -2 corrugating and 2 straightening which can together apply effective strain of 1.16, according to the analytical formula [13]. Samples were polished by SiC papers and diamond suspensions up to 1 µm fineness.…”

Section: Introductionmentioning

confidence: 99%

Grain Structure and Microhardness Development of Twin-Roll Cast Aluminum Strips after Constrained Groove Pressing

et al. 2018

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“…(2)-(12) can characterize the yield stress σ Y of AZ31B after HSEM. According to the research results of Khodabakhshi and co-workers [55], the relationship between hardness and strength in SPD metals can be presented as follow:…”

Section: Theoretical Modelmentioning

confidence: 99%

A new method for grain refinement in magnesium alloy: High speed extrusion machining

Liu

Cai

Dai

2016

Materials Science and Engineering: A

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a b s t r a c tMagnesium alloys have received broad attentions in industry due to their competitive strength to density ratio, but the poor ductility and strength limit their wide range of applications as engineering materials. A novel severe plastic deformation (SPD) technique of high speed extrusion machining (HSEM) was used here. This method could improve the aforementioned disadvantages of magnesium alloys by one single processing step. In this work, systematic HSEM experiments with different chip thickness ratios were conducted for magnesium alloy AZ31B. The microstructure of the chips reveals that HSEM is an effective SPD method for attaining magnesium alloys with different grain sizes and textures. The magnesium alloy with bimodal grain size distribution has increased mechanical properties than initial sample. The electron backscatter diffraction (EBSD) analysis shows that the dynamic recrystallization (DRX) affects the grain refinement and resulting hardness in AZ31B. Based on the experimental observations, a new theoretical model is put forward to describe the effect of DRX on materials during HSEM. Compared with the experimental measurements, the theoretical model is effective to predict the mechanical property of materials after HSEM.

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“…Микротвердость сплава в состоянии поставки не превышала HV = 41. Полученные данные согласуются с результатами двукратного повышения микротвердости алюминиевого сплава AA3003 после ПР, полученными Khodabakhshi с соавторами [15].…”

Section: результаты и обсуждениеunclassified

Influence of structure to plastic deformation resistance of aluminum alloy 1560 after groove pressing treatment

Moskvichev¹,

Skripnyak²,

Лычагин³

et al. 2016

LoM

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As a result of groove pressing treatment the influence of structural changes was investigated in the samples made of rolled sheet of an aluminum alloy 1560 in the presented research work. Mechanical properties of material was investigated experimentally in quasi-static uniaxial tensile tests at a speed of deformation of s-1 in the as-received condition and after severe plastic deformation by groove pressing technique. Change of microhardness value of rolled sheet 1.5 mm in thickness has been determined in a sample after four cycles of groove pressing in comparison with a sample in as-received condition. It was determined that after four treatment cycles, yield strength and fracture resistance of rolled alloy sheet increased in 1.4 and 1.5 times, respectively, and microhardness value increased in ~ 2.7 times. Hardening of the studied alloy was accompanied by relative reduction of ultimate strength deformation from 21% in a sample made from aluminum alloy 1560 in as-received condition to 16.7% in a sample made of aluminum alloy 1560 after four groove pressing cycles. Analysis of change results in the grain structure was made by electron backscatter diffraction method. Groove pressing technique processing of aluminum alloy 1560 leads to the formation of bimodal grain structure, which consists of coarse elongated grains and aggregates of micron and submicron sizes with an equiaxial shape. The obtained data are consistent with the experimental data of strength characteristics increase of aluminum alloy 1560 by comparison with other methods of severe plastic deformation.

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Hardness−strength relationships in fine and ultra-fine grained metals processed through constrained groove pressing

Cited by 128 publications

References 51 publications

Grain Structure and Microhardness Development of Twin-Roll Cast Aluminum Strips after Constrained Groove Pressing

Grain Structure and Microhardness Development of Twin-Roll Cast Aluminum Strips after Constrained Groove Pressing

A new method for grain refinement in magnesium alloy: High speed extrusion machining

Influence of structure to plastic deformation resistance of aluminum alloy 1560 after groove pressing treatment

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