Evolution in hardness and texture of a ZK60A magnesium alloy processed by high-pressure torsion

Han-Joo, Lee; Lee, Sang Kyung; Jung, Kwang Hyo; Lee, Geun An; Ahn, Byungmin; Kawasaki, Megumi; Langdon, Terence G.

doi:10.1016/j.msea.2015.02.011

Cited by 78 publications

(60 citation statements)

References 58 publications

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“…For reference, the saturated H v values were ;63-65 for Al-1050 (Ref. 36) and ;105-110 for the ZK60 alloy 37 after HPT for 5 turns under 6.0 GPa and these values were reasonably saturated across the disk diameters without any evidence for the hardness gradations which are often present along the diameters of disks in the early stages of HPT. 38,39 The unique distribution of hardness after 10 turns was described in a recent report.…”

Section: B Microhardness Distribution and Xrd Analysismentioning

confidence: 96%

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Using high-pressure torsion to process an aluminum–magnesium nanocomposite through diffusion bonding

et al. 2015

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Disks of commercial Al-1050 and ZK60A alloys were stacked together and then processed by conventional high-pressure torsion (HPT) through 1 and 5 turns at room temperature to investigate the synthesis of an Al-Mg alloy system. Measurements of microhardness and observations of the microstructures and local compositions after processing through 5 turns revealed the formation of an ultrafine multi-layered structure in the central region of the disk but with an intermetallic b-Al 3 Mg 2 phase in the form of nano-layers in the nanostructured Al matrix near the edge of the disk. The activation energy for diffusion bonding of the Al and Mg phases was estimated and it is shown that this value is low and consistent with surface diffusion due to the very high density of vacancy-type defects introduced by HPT processing. The results demonstrate a significant potential for making use of HPT processing in the preparation of new alloy systems.

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Section: B Microhardness Distribution and Xrd Analysismentioning

confidence: 96%

“…For comparison purposes, the map includes the hardness ranges of ;63-65 for Al-1050 (Ref. 36) and ;105-110 for the ZK60 alloy 37 after HPT for 5 turns in gray and yellow markers, respectively. As was shown in Fig.…”

Section: B Microhardness Distribution and Xrd Analysismentioning

confidence: 99%

Using high-pressure torsion to process an aluminum–magnesium nanocomposite through diffusion bonding

et al. 2015

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“…4 where the sample subjected only to compression is designated by N = 0. This approach was demonstrated in an earlier report considering texture evolution in an AZ31 magnesium alloy under different testing histories [32] and recently it was applied to a ZK60 magnesium alloy processed through HPT [12].…”

Section: Texture and Crystallographic Variationsmentioning

confidence: 99%

“…As demonstrated earlier, it is common to have large microstructural and texture differences between the center and edge regions of the disks after HPT [12] and therefore a small hole with a diameter of 3 mm was punched in the center of each repolished disk after hardness testing in order to evaluate the crystallographic characteristics only from the region that was well-deformed by torsional straining in each processed disk. The values of the lattice parameter, a, dislocation density, ρ, and mean crystallite size, <x> area , were determined from the XRD patterns for the as-annealed alloy prior to HPT and at the edge regions of the disks processed by HPT.…”

Section: Experimental Materials and Proceduresmentioning

confidence: 99%

Significance of grain refinement on microstructure and mechanical properties of an Al-3% Mg alloy processed by high-pressure torsion

Lee

Han

Janakiraman

et al. 2016

Journal of Alloys and Compounds

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Significance of grain refinement on microstructure and mechanical properties of an Al-3% Mg alloy processed by high-pressure torsion, Journal of Alloys and Compounds (2016), doi: 10.1016/ j.jallcom.2016 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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“…1(b). For reference, the Vickers microhardness, Hv, were ~65 for the Al-1050 alloy 20 and ~110 for the ZK60 alloy 21 when processed by HPT for 5 turns and thus these Hv values reached a saturation level across the disk diameters due to sufficient torsional straining. 22,23 A very first demonstration for the construction of the color-coded hardness maps were shown by using a set of Vickers microhardness values on disk surfaces of an HPT-processed pure Al.…”

Section: Processing Of the Al-mg Systemmentioning

confidence: 99%

Using Severe Plastic Deformation to Fabricate Strong Metal Matrix Composites

Kawasaki

Langdon

2017

Mat. Res.

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The processing of bulk metals through the application of severe plastic deformation leads to significant grain refinement and a consequent strengthening of the material. High-pressure torsion (HPT) generally refers to the processing of disk samples and this technique is especially effective in producing extremely small grains. Recently, new experiments were conducted in which disks of two different alloys, based on aluminum and magnesium, were stacked together and then processed by HPT for up to 20 turns at room temperature. Analysis after processing revealed the formation of a multi-layered structure in the central region of the disks but with a true nanoscale microstructure containing different types of intermetallic compounds within an Al matrix leading to the formation of metal matrix nanocomposites at the disk edges. Measurements showed a lowering of density at the disk edges, thereby confirming the potential for using HPT to fabricate materials with exceptionally high strength-to-weight ratios.

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Evolution in hardness and texture of a ZK60A magnesium alloy processed by high-pressure torsion

Cited by 78 publications

References 58 publications

Using high-pressure torsion to process an aluminum–magnesium nanocomposite through diffusion bonding

Using high-pressure torsion to process an aluminum–magnesium nanocomposite through diffusion bonding

Significance of grain refinement on microstructure and mechanical properties of an Al-3% Mg alloy processed by high-pressure torsion

Using Severe Plastic Deformation to Fabricate Strong Metal Matrix Composites

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