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Titolo:
Forced mixing and nanoscale decomposition in ball-milled Cu-Ag characterized by APFIM
Autore:
Wu, F; Bellon, P; Melmed, AJ; Lusby, TA;
Indirizzi:
Univ Illinois, Dept Mat Sci & Engn, Urbana, IL 61801 USA Univ Illinois Urbana IL USA 61801 pt Mat Sci & Engn, Urbana, IL 61801 USA Johns Hopkins Univ, Dept Mat Sci & Engn, Baltimore, MD 21218 USA Johns Hopkins Univ Baltimore MD USA 21218 & Engn, Baltimore, MD 21218 USA
Titolo Testata:
ACTA MATERIALIA
fascicolo: 3, volume: 49, anno: 2001,
pagine: 453 - 461
SICI:
1359-6454(20010208)49:3<453:FMANDI>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUPERSATURATED SOLID-SOLUTIONS; PLASTIC-DEFORMATION; IMMISCIBLE ELEMENTS; PHASE-SEPARATION; ATOM-PROBE; FE; ALLOYS; SYSTEM; AL; NI;
Keywords:
mechanical alloying; atom probe; alloys (copper, silver); nanostructures; theory & modeling (kinetics, transport, diffusion);
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Bellon, P Univ Illinois, Dept Mat Sci & Engn, 1304 W Green St, Urbana, IL 61801 USA Univ Illinois 1304 W Green St Urbana IL USA 61801 , IL 61801 USA
Citazione:
F. Wu et al., "Forced mixing and nanoscale decomposition in ball-milled Cu-Ag characterized by APFIM", ACT MATER, 49(3), 2001, pp. 453-461

Abstract

Ag50Cu50 alloys are prepared by high energy ball milling at different controlled temperatures, 85 K, 315 K and 453 K, with milling times long enough to reach steady-state. Atom probe field ion microscopy (APFIM) is used to characterize the atomic mixing forced by low temperature milling and to study the nanocomposite materials stabilized by elevated temperature milling. Anew method is devised that makes it possible to prepare sharp tips from ball-milled powders. Statistical analysis of the APFIM composition profiles is used to determine the degree of mixing as a function of the length scale. These results are compared with the ones obtained from kinetic Monte Carlosimulations. Cryo-milling results in nearly random mixing of copper and silver, whereas the mixing achieved by milling at 315 K is calculated to be around 70%. 453 K milling results in the decomposition into copper-rich and silver-rich regions at a scale of approximate to 25 nm. (C) 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

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Documento generato il 20/01/21 alle ore 15:06:31