Harmonic-structured copper: performance and proof of fabrication concept based on severe plastic deformation of powders

Sawangrat, Choncharoen; Kato, Shota; Orlov, Dmitry; Ameyama, Kei

doi:10.1007/s10853-014-8258-4

Cited by 153 publications

(56 citation statements)

References 27 publications

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“…It appears that the plastic deformation is only limited to the surface of the powder particles. Similar morphological observations have been reported also in literature 9,12,13) . Moreover, it is also noticed that the Si particles have fragmented to signi cantly smaller particle size after mechanical milling.…”

Section: Methodssupporting

confidence: 92%

“…Recently, Ameyama and co-workers have proposed a microstructural design to improve mechanical properties by obtaining both high strength and high ductility in metallic materials, through the formation of so-called harmonic structured material [1][2][3][4][5][6][7][8][9][10][11][12][13] . Essentially, it is an exquisite heterogeneous microstructural design, consisting of bimodal grain size distribution, in which ductile coarse grained regions (termed as core ) are enclosed in a continuously connected three-dimensional networks regions with high strength ultra-ne grained structure, known as shell .…”

Section: Introductionmentioning

confidence: 99%

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Application of Al-Si Semi-Solid Reaction for Fabricating Harmonic Structured Al Based Alloy

et al. 2016

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The present work deals with a novel approach of fabricating harmonic structure in Al alloy through the application of semi-solid reaction between Al and Si. The harmonic structured Al was prepared by powder metallurgy route, where the Al and Si powder were subjected to controlled mechanical milling followed by subsequent spark plasma sintering to make a compact. The sintered compact resulted in a network structure of hard interconnected silicon dispersed region combined with Al-Si solid solution phase, known as shell , enclosing the soft phase of pure aluminum matrix known as core . The harmonic structured Al compact demonstrated retention of both uniform and total elongation as compared to its heterogeneous bimodal structure counterpart, which is the typical feature of the harmonic structured material. The application of semi-solid reaction between Al and Si in fabricating harmonic structure proved to be effective in improving mechanical properties of Al alloy. Present work also discusses the deformation behavior of the sintered compacts, with respect to its strain hardening behavior.

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Section: Methodssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Application of Al-Si Semi-Solid Reaction for Fabricating Harmonic Structured Al Based Alloy

et al. 2016

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“…In the previous studies, metallic materials with harmonic structure, such as pure copper 9) , stainless steel 10)-12) ,…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Fatigue Properties of Ti-6Al-4V Alloy with Harmonic Structure in 4-Points Bending

Kikuchi

Takemura

Hayami

et al. 2015

Journal of the Society of Materials Science, Japan

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Titanium alloy (Ti-6Al-4V) having a bimodal "harmonic structure", which consists of the coarse-grained structure surrounded by the network structure with fine grains, was fabricated by mechanical milling (MM) and spark plasma sintering (SPS) to achieve high strength and good plasticity. The microstructure of the MM-processed powder and the sintered compacts were characterized using a micro-Vickers hardness tester, scanning electron microscope (SEM) and an electron backscatter diffraction technique (EBSD). Harmonic structure was created in the sintered Ti-6Al-4V compacts prepared from the MM-processed powders having fine grains at its surface. The Ti-6Al-4V alloy with harmonic structure exhibited high tensile strength and good plasticity. The effects of the harmonic structure on the 4-points bending fatigue properties of Ti-6Al-4V alloy was investigated under the stress ratio R = 0.1 in ambient air without any controls of the temperature. The compacts with harmonic structure exhibited higher fatigue strength compared to the conventional coarse-grained material prepared from as-received initial powders. This was because the Ti-6Al-4V alloy with harmonic structure had higher tensile strength and hardness. Moreover, fatigue fracture mechanism of the Ti-6Al-4V alloy with harmonic structure was discussed from viewpoints of fractography and crystallography. As results of observing and analyzing the fracture surfaces, the Ti-6Al-4V alloy with harmonic structure failed from the coarse grain in the harmonic structure in the surface fracture mode.

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“…To deal with the above-mentioned issues of controlled heterogeneous microstructure, Ameyama et al proposed an integrated approach to prepare bulk materials with a controlled and unique heterogeneous microstructure, called 'harmonic structure' (HS), with bimodal grain size distribution. [15][16][17][18][19][20][21][22][23][24][25] A schematic diagram illustrating the HS design is shown in Figure 1. The HS is a heterogeneous microstructure with a specific spatial distribution of fine and coarse grains, that is, the CG areas ('core') embedded in the matrix of three-dimensional continuously connected network ('shell') of fine-grained (FG) areas.…”

mentioning

confidence: 99%

“…It has also been demonstrated that the shell/core fraction can be successfully controlled by controlling milling time and number of milling passes in BM process and JM process, respectively. [19][20][21][22] The milled bimodal powders are consolidated at elevated temperatures to prepare bulk materials. Recently, spark plasma sintering (SPS) has been used extensively for the consolidation due to rapid sintering together with avoidance of deformation induced texture during consolidation process.…”

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confidence: 99%

Three-dimensionally gradient harmonic structure design: an integrated approach for high performance structural materials

Vajpai

Ota

Zhang

et al. 2016

Materials Research Letters

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Harmonic-structured copper: performance and proof of fabrication concept based on severe plastic deformation of powders

Cited by 153 publications

References 27 publications

Application of Al-Si Semi-Solid Reaction for Fabricating Harmonic Structured Al Based Alloy

Application of Al-Si Semi-Solid Reaction for Fabricating Harmonic Structured Al Based Alloy

Evaluation of the Fatigue Properties of Ti-6Al-4V Alloy with Harmonic Structure in 4-Points Bending

Three-dimensionally gradient harmonic structure design: an integrated approach for high performance structural materials

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