Spark plasma sintering of dispersion hardened Cu–Cr–Nb alloy powders

•Milled powders show enhanced sinterability during spark plasma sintering (SPS).•Enhanced mechanical properties of SPSed samples made from milled powder.•Mechanism of sintering for SPSed samples of Cu–Cr–Nb alloy is proposed. The densification behavior of dispersion hardened Cu–Cr–Nb alloy powders h...

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Bibliographic Details
Published in:Journal of alloys and compounds 2013-11, Vol.577, p.70-78
Main Authors: Shukla, A.K., Narayana Murty, S.V.S., Suresh Kumar, R., Mondal, K.
Format: Article
Language:English
Subjects:
Alloy powders
Atomizing
CHROMIUM COPPERS
Condensed matter: structure, mechanical and thermal properties
COPPER ALLOYS (40 TO 99.3 CU)
Copper base alloys
Cross-disciplinary physics: materials science
rheology
Densification
Density
DISPERSION HARDENING MECHANISMS
Dispersions
Elasticity, elastic constants
Exact sciences and technology
Materials science
Materials synthesis
materials processing
Mechanical and acoustical properties
Mechanical and acoustical properties of condensed matter
Mechanical properties
Mechanical properties of solids
Metals and alloys
Physical properties of thin films, nonelectronic
Physics
Powder metallurgy
POWDERS
PREALLOYED POWDERS
PRECIPITATES
SINTERING
Spark plasma sintering
SPARK SINTERING
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
Tribology and hardness
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Summary:•Milled powders show enhanced sinterability during spark plasma sintering (SPS).•Enhanced mechanical properties of SPSed samples made from milled powder.•Mechanism of sintering for SPSed samples of Cu–Cr–Nb alloy is proposed. The densification behavior of dispersion hardened Cu–Cr–Nb alloy powders has been studied by spark plasma sintering using varying stress and temperature. The densification has been strongly inhibited by the presence of intermetallic Cr2Nb precipitates. The mechanically milled powders with disk shaped nature have resulted in higher relative density as compared to spherical shaped gas atomized powders in all the experiments. The hardness and compressive yield strength of the sintered alloy samples have been found to have a linear relationship with relative density and it was independent of process parameters for both the atomized and milled powders.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2013.04.088