Strength and microstructure of powder metallurgy processed restacked Cu-Nb microcomposites

Pourrahimi, S.; Nayeb-Hashemi, Hamid; Foner, S.

doi:10.1007/bf02801175

Cited by 28 publications

(18 citation statements)

References 19 publications

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“…The Cu-Nb system also In the present work, three morphologies of Ni powders, corresponding to fine (3 to 7 m average size), flaky (Ϫ44-represents a refractory material with high thermal conductivity [23,24] and has significant technological interest. [25][26][27][28][29][30][31] Varim wide, 0.37-m thick) and coarse (ϳ44 m average size) powders, were mixed with coarse-rounded Cu powders (ϳ44 ous nonequilibrium processing approaches, e.g., mechanical alloying, intense deformation, and controlled solidification, m average size) to investigate the effects of powder morphology variation on shock-induced reaction synthesis in have been employed in attempts to synthesize immiscible Cu-Nb alloys or their nanocomposites. Hence, our objective the Cu-Ni isomorphous alloy system.…”

Section: Introductionmentioning

confidence: 99%

Shock-induced reaction synthesis of isomorphous (Cu-Ni) and immiscible (Cu-Nb) compounds

Advani¹,

Thadhani

1999

Metall Mater Trans A

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Shock compression of Cu-Ni and Cu-Nb elemental powder mixtures was investigated to study the shock-induced chemical reaction behavior of material systems with very low heats of formation and to synthesize isomorphous, as well as otherwise-immiscible, compounds. Shock loading experiments were performed using a 12-capsule plate-impact recovery fixture, with explosive loading at 0.9 to 1.6 km/s impact velocities. The Cu-Ni powder mixtures revealed formation of an isomorphous CuNi solid-solution alloy with a fine dendritic microstructure, formed via a mechanism involving intense mechanical mixing and melting of elemental reactants. The extent of the reaction was dependent on the shock strength, and the chemistry of the product was observed to depend on the morphology of the powders due to its effect on the crush strength. In the case of Cu-Nb powder mixtures, submicronscale mechanical mixing was observed between the reactants, with possible dissolution of as much as 10 wt pct solute in each component. Complete alloying of copper and niobium was also observed, as indicated by transmission electron microscopy (TEM)/energy-dispersive X-ray (EDS) and X-ray diffraction (XRD) analysis; however, the alloyed region showed the presence of Mo and other impurity elements from the stainless steel capsule. These additives may, in fact, be responsible for stabilizing the ternary compound, in an otherwise immiscible Cu-Nb system.

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Section: Introductionmentioning

confidence: 99%

Shock-induced reaction synthesis of isomorphous (Cu-Ni) and immiscible (Cu-Nb) compounds

Advani¹,

Thadhani

1999

Metall Mater Trans A

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“…Large interphase area and grain boundaries are all dislocation sources. It is assumed [37] the distance between dislocations L is equal to the average filament thickness D, which gives…”

Section: Comparison To Other Al Matrix Dmmcsmentioning

confidence: 99%

Texture–strength relationships in a deformation processed Al–Sn metal–metal composite

Russell

2004

Materials Science and Engineering: A

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“…It is noted that the largest Nb-Ta alloy powder particles used in the original powder mixture were 500 pm, therefore after the nominal areal reduction of lo000 at 1.5 mm diameter, the calculated filament diameter is 5 pm. However, these particles are for the most part single crystals that elongate to produce filaments with ribbon-like cross sections during wire fabrication [5]. The thickness of isolated individual filaments was measured to be about 1 p m thick.…”

Section: N Heattrea"tandmicro!xrucizirementioning

confidence: 99%

Powder metallurgy processed Nb/sub 3/Sn(Ta) wire for high field NMR magnets

Pourrahimi

Williams

DeMoranville³

et al. 1995

IEEE Trans. Appl. Supercond.

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Powder metallurgy together with a niultitin core approach was used to fabricate industrial scale lengths of Ta alloyed Nb3Sn wire. The wire produced high critical currents (Ic) along with high critical current densities (J,.) at fields up to 20 tesla and 4.2 K. The wire was produced for a program funded by Battelle Pacific Northwest. One objective o f t h e p r o g r a m w a s t o c o m p a r e v a r i o u s commercially available wires for applications in high field NMR magnets. The 1.5 mm diameter PM wire compares well with other wires tested in the program. More than 250 m of the 1.5 mm diameter wire was used to fabricate a superconducting model coil. The coil exhibited an IC equal to that of a short sample. The performance of the Ta doped wire examined here was lower than those of similar PM wires which were produced earlier using Ti doping. Diffusion dynamics of the tin inside the wire was studied at various stages of heat treatment and was correlated to the properties of the wire.

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Strength and microstructure of powder metallurgy processed restacked Cu-Nb microcomposites

Cited by 28 publications

References 19 publications

Shock-induced reaction synthesis of isomorphous (Cu-Ni) and immiscible (Cu-Nb) compounds

Shock-induced reaction synthesis of isomorphous (Cu-Ni) and immiscible (Cu-Nb) compounds

Texture–strength relationships in a deformation processed Al–Sn metal–metal composite

Powder metallurgy processed Nb/sub 3/Sn(Ta) wire for high field NMR magnets

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