Effect of a small amount of additional carbon on the ductility of recrystallized sintered-molybdenum sheet

Hiraoka, Yutaka; Morito, F.; Okada, Masatoshi; Watanabe, Ryoji

doi:10.1016/0022-3115(78)90517-2

Cited by 40 publications

(5 citation statements)

References 15 publications

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“…In contrast to tungsten, already small amounts (> 20 ppm) of additional carbon are known to remarkably improve the ductility of molybdenum [24]. This is in accordance to our observation of a pronounced ductility during necking of the Mo fiber core at room temperature.…”

Section: Resultssupporting

confidence: 92%

Novel ceramic matrix composites with tungsten and molybdenum fiber reinforcement

Mainzer

Lin

Frieß

et al. 2021

Journal of the European Ceramic Society

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Ceramic matrix composites usually utilize carbon or ceramic fibers as reinforcements. However, such fibers often expose a low ductility during failure. In this work, we follow the idea of a reinforcement concept of a ceramic matrix reinforced by refractory metal fibers to reach pseudo ductile behavior during failure. Tungsten and molybdenum fibers were chosen as reinforcement in SiCN ceramic matrix composites manufactured by polymer infiltration and pyrolysis process. The composites were investigated with respect to microstructure, flexural-and tensile strength. The single fiber strengths for both tungsten and molybdenum were investigated and compared to the strength of the composites. Tensile strengths of 206 and 156 MPa as well as bending strengths of 427 and 312 MPa were achieved for W/SiCN and Mo/SiCN composites, respectively. The W fiber became brittle across the entire cross section, while the Mo fiber showed a superficial, brittle reaction zone but kept ductile on the inside.

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Section: Resultssupporting

confidence: 92%

Novel ceramic matrix composites with tungsten and molybdenum fiber reinforcement

Mainzer

Lin

Frieß

et al. 2021

Journal of the European Ceramic Society

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“…Grain boundaries of pure molybdenum after recrystallization are intrinsically weak [2] and hence its fracture mode is principally an intergranular-type. However, small addition of carbon strengthens these grain boundaries [2][3][4][5][6][7] and consequently changes the fracture mode from an intergranular-type to a transgranular-type. Carbon addition was carried out at relatively low temperatures with the heating time being short and constant (1.2 ks).…”

Section: Introductionmentioning

confidence: 99%

Carbon diffusion behavior in molybdenum at relatively low temperatures

Hiraoka¹,

Imamura²,

Kadokura³

et al. 2010

Journal of Alloys and Compounds

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“…[1][2][3][4][5][6][7][8] A small amount of carbon can significantly enhance the fracture strength of pure molybdenum, and consequently, its ductility. The latter effect is characterized by the relative decreasing in the ductile-to-brittle transition temperature (DBTT).…”

Section: Introductionmentioning

confidence: 99%

“…Hiraoka et al 4,5,8) investigated the effects at low temperatures of a small amount of carbon on the fracture strength and ductility of commercially available pure molybdenum. They found that both the strength and ductility depend on the carbon content and peak values at a carbon content of as low as 14 mass ppm were demonstrated.…”

Section: Introductionmentioning

confidence: 99%

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Change of Mechanical Property and Fracture Mode of Molybdenum by Carbon Addition

Kadokura¹,

Hiraoka

Yamamoto³

et al. 2010

Mater. Trans.

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Commercially available specimens of pure molybdenum were immersed in a graphite-filled Ta container and heated at a relatively low temperature of 1373 and 1473 K for 1.2 to 18.0 ks. Changes in the yield and maximum strength were evaluated by a three-point bending test at a temperature between room temperature and liquid-nitrogen temperature. Then two parameters, critical stress (apparent intergranular fracture strength) and critical temperature (DBTT), were determined. Finally, the fracture mode was examined using SEM and the apparent transgranular fracture strength was estimated from the relationship between the critical stress and the fracture mode.Results are summarized as follows. (1) Both the critical stress and the critical temperature changed drastically with carbon addition and exhibited a peak value under optimum conditions: 1373 K-3.6 ks and 1473 K-1.2 ks. (2) The fracture mode changed from intergranular to transgranular after carbon addition. (3) The change in the critical stress as a function of the increase in carbon content in this work almost agrees with that in the previous work of Hiraoka et al. (4) The apparent transgranular fracture strength was unchanged (about 990 MPa) after carbon addition of 10 mass ppm or less. This value is almost equal with that before carbon addition. The apparent transgranular fracture strength was lowered after excess carbon addition.

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Effect of a small amount of additional carbon on the ductility of recrystallized sintered-molybdenum sheet

Cited by 40 publications

References 15 publications

Novel ceramic matrix composites with tungsten and molybdenum fiber reinforcement

Novel ceramic matrix composites with tungsten and molybdenum fiber reinforcement

Carbon diffusion behavior in molybdenum at relatively low temperatures

Change of Mechanical Property and Fracture Mode of Molybdenum by Carbon Addition

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