The structure and microhardness evolution in submicrocrystalline molybdenum processed by severe plastic deformation followed by annealing

Kolobov, Yu. R.; Kieback, Bernd; Ivanov, K. V.; Weissgaerber, Th.; Гирсова, Н. В.; Pochivalov, Yu. I.; Grabovetskaya, G. P.; Иванов, М. Б.; Kazyhanov, V.; Alexandrov, Igor

doi:10.1016/s0263-4368(03)00002-7

Cited by 42 publications

(27 citation statements)

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“…The Vickers hardness at the saturated level (HV) of a wide range of pure metals and semi-metals with various crystal structures processed through severe plastic deformation (SPD) have been reported [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]28,66]. In this work, we study the increment of hardness (∆HV) of 17 high purity (better than 99.9%) elements due to HPT reported in [4,5,9,10,23,28,66] (see Table 1).…”

Section: Hardness Data Of Hpt Processed Metalsmentioning

confidence: 98%

“…Following extensive work in the field by a range of researchers, extensive data on the hardness and microstructure of HPT processed metals and alloys is now available (e.g. [4,5,6,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22]). Data on hardness increase due to HPT have been published for over 20 pure metals, and several of the factors influencing the hardness of HPT processed pure metals have been investigated in some detail by Edelati and Horita [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Hardening of pure metals by high-pressure torsion: A physically based model employing volume-averaged defect evolutions

2013

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Section: Hardness Data Of Hpt Processed Metalsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Hardening of pure metals by high-pressure torsion: A physically based model employing volume-averaged defect evolutions

2013

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“…[1][2][3][4][5][6][7][8][9][10][11][12] The HPT has been applied to a wide range of metallic materials including ductile metals such as Al, 2) Cu, 3) Ni 4,5) and Fe, 6,7) and relatively hard and low ductile metals such as Ti, 8) Zr, 12) Mg, 9) Mo 10) and W. 11) The HPT is generally used with thin disc 1,13) or ring samples. 14) Using discs and/or rings, earlier reports showed that the hardness variation is represented by a unique function of the equivalent strain in Al, 14) Cu, 15) Fe, 7) Ti 16) and Zr.…”

Section: Introductionmentioning

confidence: 99%

Universal Plot for Hardness Variation in Pure Metals Processed by High-Pressure Torsion

Edalati

Horita

2010

Mater. Trans.

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Various pure metals (Al, Au, Ag, Cu, V, Pt, Ni, Fe, Co, Ti, Zr, Hf, Mo) including Cu-30%Zn are processed by high-pressure torsion. Most of Vickers microhardness (HV) values are expressed by a universal plot when they are normalized as ðHV=GÞðT=T m Þ and plotted against "P=G, where G, T=T m , " and P are the shear modulus, homologous temperature, equivalent strain and pressure, respectively. Deviations to this plot are for Al (99.99%), Ti, Zr, Hf and Cu-30%Zn and for when P is below a critical pressure.

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“…Although many reports are available for Fe, [10][11][12][13] very limited applications have been reported on the bcc metals using the HPT process. [14][15][16][17][18][19] In this research, two bcc metals, V and Mo, are selected because not only there are few studies using the HPT process but also there is a marked difference in the strength between V and Mo where V is softer and lower melting point (2136 K) but Mo is harder and higher melting point (2883 K).…”

Section: Introductionmentioning

confidence: 99%

Microstructures and Mechanical Properties of Pure V and Mo Processed by High-Pressure Torsion

2010

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Two body centered cubic (bcc) metals, V and Mo, were processed by high pressure torsion (HPT) at ambient temperature. Hardness variation as well as microstructural evolution was examined with strain under a pressure of 2 to 6 GPa. It was shown that the hardness increases with straining and saturates to a constant level with the grain size of 330-400 nm in V irrespective of the applied pressures. Although the hardness variation with strain is the same for Mo with the grain size of $350 nm at the saturation level when the applied pressure is 6 GPa, the hardness level lowers below the saturation level and the grain size becomes coarser as the pressure is lowered. Tensile tests show that the strength significantly increases with some ductility for V after processing under any pressure and for Mo under lower pressures, but brittle fracture occurs in the Mo specimen processed at 6 GPa. The slower evolution of microstructure as well as the lower hardness levels observed in Mo is due to the applied pressure which is lower than the yield stress and thus due to the insufficient generation of dislocations for grain refinement.

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The structure and microhardness evolution in submicrocrystalline molybdenum processed by severe plastic deformation followed by annealing

Cited by 42 publications

References 1 publication

Hardening of pure metals by high-pressure torsion: A physically based model employing volume-averaged defect evolutions

Hardening of pure metals by high-pressure torsion: A physically based model employing volume-averaged defect evolutions

Universal Plot for Hardness Variation in Pure Metals Processed by High-Pressure Torsion

Microstructures and Mechanical Properties of Pure V and Mo Processed by High-Pressure Torsion

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