Production of amorphous bulk material of an Nd15Fe77B8 magnetic alloy by the compression shearing method

Saito, Tetsuji; Takeishi, Hiroyuku; Nakayama, Noboru

doi:10.1016/j.jallcom.2004.12.040

Cited by 15 publications

(4 citation statements)

References 11 publications

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“…COSME-RT is used to form thin metal plates by applying a shear strain and a compression stress to a metal powder at room temperature and in air [8][9][10][11][12][13][14][15]. In COSME-RT, the metal powders obtain a bonding energy in a mechanical process with strains in two axial directions, and without heating.…”

Section: Introductionmentioning

confidence: 99%

Cu-Based MoS2-Dispersed Composite Material Formed by the Compression Shearing Method at Room Temperature

et al. 2017

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Cu/MoS 2 composite material was formed by a novel powder-molding technique, which is termed the compression shearing method at room temperature (COSME-RT). Cu/MoS 2 sample mechanical and tribological properties and microstructures were investigated. Samples were prepared using five different MoS 2 concentrations between 0 to 20 vol.%. No unwanted compounds were generated by the Cu and MoS 2 because a high temperature is unnecessary in COSME-RT. Scanning electron microscopy observations confirmed that the MoS 2 particles were dispersed homogeneously in the Cu host matrix. The indentation hardness of Cu/MoS 2 with 0, 1.0 and 5.0 vol.% MoS 2 was higher than 1.6 GPa, and is higher than that formed by conventional powder metallurgy methods and a pure Cu plate. The indentation hardness of the Cu/MoS 2 decreased with increasing MoS 2 concentration. In contrast, the lubricating performance of MoS 2 became more pronounced at 5.0 vol.% or above. The coefficient of friction of Cu/MoS 2 with 5.0, 10 and 20 vol.% MoS 2 was ~0.20, and is the same as for MoS 2 in air. The sample coefficient of friction was maintained because of lubrication by forming a transferred film of wear debris that contained MoS 2 . Cu/MoS 2 had a low coefficient of friction, but maintained its material strength at 5.0 vol.% MoS 2 .

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Section: Introductionmentioning

confidence: 99%

Cu-Based MoS2-Dispersed Composite Material Formed by the Compression Shearing Method at Room Temperature

et al. 2017

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“…The shape of the powder particles, formed by a Water atomization method, was non-spherical. Forming conditions COSME-RT is the method of forming thin metal plates by simultaneously applying a shearing strain and a compressive stress to metal powders [1][2][3][4][5][6][7]. A schematic of COSME-RT is shown in Fig.…”

Section: Materials (Cu-11mn-4ni Powder)mentioning

confidence: 99%

Effect of Shearing Distance on Mechanical and Electrical Properties for Cu-11Mn-4Ni Thin Plate Formed by Compression Shearing Method at Room Temperature

Nakayama

Inoue

Kusunoki

et al. 2018

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ince the temperature coefficient of resistance of Manganin (Cu-12Mn-2Ni) is extremely small, Manganin plate are used for resistors, especially shunts for current sensing.Generally, the melting and casting is used as a method to make an alloy such as Manganin. Further, the Manganin used as resistive material is produced by rolling after casting. Since such manufacturing processes have heating steps, long molding time is necessary and temperature control is important.In recent years, Cu-11Mn-4Ni powder has been developed. If manganin plate can be produced directly from alloy powder, simplification of the manufacturing process can be expected. A powder metallurgy is used as a method of solidifying and shaping the alloy powder. However many pores are generated in the sample because of using a binder. Therefore, the resistance value of the alloy fabricated through the method may not be stable.The Compression Shearing Method at Room Temperature (COSME-RT) is one of solutions to achieve the high density forming. In COSME-RT alloy powders are simultaneously loaded by a shearing force and a compressive stress in air at room temperature to form a plate. In the process, temperature control is unnecessary and the manufacturing time becomes shorter.In the present study, the fabrication of Cu-11Mn-4Ni plate is carried out by compression shearing method at room temperature and mechanical and electrical properties of the plate are evaluated.

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“…Several methods to form composites, such as powder metallurgy and casting-based methods have been attempted to achieve such requirements [1][2][3][4][5][6][7]. In recent years, our research group has focused on a novel powder-molding method, the compression shearing method at room temperature (COSME-RT) [8][9][10][11][12][13][14][15][16][17][18][19], to meet the material requirements. COSME-RT is used to form a thin plate by applying a simultaneous compressive stress and shearing strain to a powder material at room temperature and in an ambient atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Role of MoS2 Addition in the Consolidation of Metal from Powder to Plate by the Compression Shearing Method at Room Temperature

et al. 2018

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We use a Cu/MoS 2 composite to provide a new approach to control the consolidation of materials by compression-shearing at room temperature. Cu/MoS 2 samples were formed under several shearing distances and the resulting microstructures were observed and compared with pure Cu samples. The microstructural change related to the decrease in applied shearing force is discussed. The structural observations indicate that the reason for the decrease in shearing force appears to be the slip of the sample on the lower plate because of MoS 2 lubrication. The internal structure of the Cu/MoS 2 samples appears to be interrupted midway through the consolidation process by dissipating the applied shearing force. In contrast, particle bonding and grain refinement occurred only on the sample surface, as for the friction process, and extended gradually to the inside of the sample when the shearing distance increased. We controlled the metal consolidation by compression shearing at room temperature by dispersing MoS 2 into a Cu matrix. The shearing force appears to be more effective in metal consolidation by compression shearing at room temperature than the shearing distance.

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Production of amorphous bulk material of an Nd15Fe77B8 magnetic alloy by the compression shearing method

Cited by 15 publications

References 11 publications

Cu-Based MoS<sub>2</sub>-Dispersed Composite Material Formed by the Compression Shearing Method at Room Temperature

Cu-Based MoS<sub>2</sub>-Dispersed Composite Material Formed by the Compression Shearing Method at Room Temperature

Effect of Shearing Distance on Mechanical and Electrical Properties for Cu-11Mn-4Ni Thin Plate Formed by Compression Shearing Method at Room Temperature

Role of MoS<sub>2</sub> Addition in the Consolidation of Metal from Powder to Plate by the Compression Shearing Method at Room Temperature

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