Mechanical properties of oxide dispersion strengthened (ODS) molybdenum alloys

Bianco, Robert; Buckman, R. W.

doi:10.2172/672101

Cited by 10 publications

(13 citation statements)

References 3 publications

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“…The mechanical properties of refractory metals with a body-centered-cubic (bcc) structure, such as molybdenum, are very sensitive to features of the microstructure such as grain size, size and number density of second phases, dislocation density, and concentration of interstitial elements [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. For example, an oxide dispersion strengthened (ODS) molybdenum alloy has exhibited excellent creep-resistance when the material is worked to produce a fine La-oxide dispersion and a fine grain size (%1.2 lm) [20][21][22][23]. The fine grain size and fine oxide dispersion of ODS Mo are also believed to produce high tensile ductility, high fracture toughness, and a low ductile to brittle transition temperature (DBTT) [24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Irradiation hardening in unalloyed and ODS molybdenum during low dose neutron irradiation at 300°C and 600°C

Cockeram¹,

Smith²,

Leonard³

et al. 2008

Journal of Nuclear Materials

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Section: Introductionmentioning

confidence: 99%

Irradiation hardening in unalloyed and ODS molybdenum during low dose neutron irradiation at 300°C and 600°C

Cockeram¹,

Smith²,

Leonard³

et al. 2008

Journal of Nuclear Materials

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“…Doping with a small amount of Al, K, Si 1,2) or rare-earth oxides [3][4][5] resulted in development of high-ductility and highly creep-resistant Mo alloys. The origin of the improved mechanical properties in the doped-Mo alloys was related to an elongated coarsegrained microstructure induced by the additives.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Fine-Grained, Sintered Molybdenum Alloys with Dispersed Particles Developed by Mechanical Alloying

et al. 2004

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In order to develop Mo alloys with improved mechanical properties of low-temperature toughness and room-and high-temperature strengths without any plastic working after consolidation, fine-grained, particle-dispersed Mo alloys were fabricated by hot isostatic pressing (HIP) or spark plasma sintering (SPS) of mechanically alloyed powders of Mo and 0.8 mol% ZrC or TaC (designated as ZRC08 and TAC08). The fabricated Mo alloys were subjected to high-temperature annealing for 3.6 ks up to 2470 K, three-point impact bending tests at temperatures from 270 to 470 K at 5 m s À1 and static tensile tests at temperatures from 300 to 1970 K at initial strain rates from 4:2 Â 10 À5 to 8:3 Â 10 À2 s À1 . The fabricated alloys exhibited no significant grain growth even after annealing at 2470 K for 3.6 ks due to the pinning effect of the particles against grain boundary migration. The ductile-to-brittle transition temperatures (DBTT) assessed by impact bending were lower and the tensile strengths up to 1770 K were higher for the fabricated alloys than for recrystallized pure Mo. In particular, HIPed TAC08 was superior in lowtemperature toughness having the DBTT lower by 30-40 K than recrystallized Mo-La 2 O 3 (TEM) with an elongated coarse-grained microstructure. HIP-or SPS-treated ZRC08 was superior in room-and high-temperature strengths, respectively. Furthermore, HIPed ZRC08 showed a large elongation of 551% at 1770 K. These excellent mechanical properties of the fabricated Mo alloys were obtained for the first time in the as-consolidated state without subsequent plastic working, and are attributable to fine-grained microstructure and grain-boundary strengthening by the fine particles.

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“…As discussed in reference [2], ODS Mo in the worked and stress-relieved condition exhibits a DBTT well below room temperature.…”

Section: Introductionmentioning

confidence: 79%

“…The microstructural properties of the ODS Mo-Re alloys are listed in Table 3 and compared with typical characteristics of PM-Mo, a Mo-14Re (solid-solution) alloy, and ODS Mo. [2,11] The microstructure of the new alloys in the as-swaged condition are characterized by elongated grains with average widths of 8 pm (0.3 roils) and 5 Urn (0.2 roils) for the ODS Mo-7Re and ODS Mo-14Re alloys, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…However, an oxide dispersion strengthened molybdenum (ODS Mo) alloy at 1800°C (3272"F) exhibits a creep-rupture strength many orders of magnitude greater than unalloyed molybdenum exhibits at 1600"C (2912" F). [2] In fact, the ODS Mo alloy is stronger in creep-rupture at 1800°C (3272"F) than either unalloyed tungsten or rhenium are at 1600"C (2912"F). In conjunction with this extraordinary strength, good low temperature ductility is displayed by the ODS Mo alloy in the cold-worked and stress-relieved condition, and the tensile ductile-to-brittle transition temperature (DBTT) is approximately -100"C (-148" F).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Evaluation of oxide dispersion strengthened (ODS) molybdenum and molybdenum–rhenium alloys

Mueller

Bianco²,

Buckman³

2000

International Journal of Refractory Metals and Hard Materials

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Mechanical properties of oxide dispersion strengthened (ODS) molybdenum alloys

Cited by 10 publications

References 3 publications

Irradiation hardening in unalloyed and ODS molybdenum during low dose neutron irradiation at 300°C and 600°C

Irradiation hardening in unalloyed and ODS molybdenum during low dose neutron irradiation at 300°C and 600°C

Mechanical Properties of Fine-Grained, Sintered Molybdenum Alloys with Dispersed Particles Developed by Mechanical Alloying

Evaluation of oxide dispersion strengthened (ODS) molybdenum and molybdenum–rhenium alloys

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