Copper-alumina nanocomposites derived from CuAlO2: Phase transformation and microstructural coarsening

Michael Robert Kracum, Christopher J. Marvel, Mihaela Albu, Ferdinand Hofer, Martin P. Harmer, Helen Chan

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

Abstract

Partial reduction of bulk CuAlO2 results in hierarchical structures wherein thereare copper-alumina regions with widely differing morphologies and scale. At thefinest level, the distribution of the 2 phases is at the nanoscale. By means ofatomic resolution STEM and electron diffraction, the nanocomposite regions wereshown to consist of a dense array of metallic copper platelets dispersed in amatrix of h-Al2O3. The copper nanoplatelets were single crystal, and they allexhibited the same orientation relationship with the matrix, namely [110]Cu//[010]h-Al2O3, (111)Cu//(4 0 2)h-Al2O3. It was shown that the 2-phase regions wherethe copper exhibited a significantly coarser, globular morphology, resulted fromdiscontinuous coarsening. Interestingly, a change in the matrix phase from h- tod-alumina was also observed as a result of the coarsening reaction. It is believedthat in the nanocomposite regions, the h-alumina phase was stabilized by thelower interfacial energy between the copper (110) platelets and the matrix.
Originalspracheenglisch
Seiten (von - bis)5801
Seitenumfang5810
FachzeitschriftJournal of the American Ceramic Society
Jahrgang101
Ausgabenummer12
DOIs
PublikationsstatusVeröffentlicht - 2018

Treatment code (Nähere Zuordnung)

  • Experimental

Dies zitieren

Copper-alumina nanocomposites derived from CuAlO2: Phase transformation and microstructural coarsening. / Kracum, Michael Robert; Marvel, Christopher J.; Albu, Mihaela; Hofer, Ferdinand; Harmer, Martin P.; Chan, Helen.

in: Journal of the American Ceramic Society, Jahrgang 101, Nr. 12, 2018, S. 5801.

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

Kracum, Michael Robert ; Marvel, Christopher J. ; Albu, Mihaela ; Hofer, Ferdinand ; Harmer, Martin P. ; Chan, Helen. / Copper-alumina nanocomposites derived from CuAlO2: Phase transformation and microstructural coarsening. in: Journal of the American Ceramic Society. 2018 ; Jahrgang 101, Nr. 12. S. 5801.
@article{88ab6ae8e1b2459ba3a72865adf5b053,
title = "Copper-alumina nanocomposites derived from CuAlO2: Phase transformation and microstructural coarsening",
abstract = "Partial reduction of bulk CuAlO2 results in hierarchical structures wherein thereare copper-alumina regions with widely differing morphologies and scale. At thefinest level, the distribution of the 2 phases is at the nanoscale. By means ofatomic resolution STEM and electron diffraction, the nanocomposite regions wereshown to consist of a dense array of metallic copper platelets dispersed in amatrix of h-Al2O3. The copper nanoplatelets were single crystal, and they allexhibited the same orientation relationship with the matrix, namely [110]Cu//[010]h-Al2O3, (111)Cu//(4 0 2)h-Al2O3. It was shown that the 2-phase regions wherethe copper exhibited a significantly coarser, globular morphology, resulted fromdiscontinuous coarsening. Interestingly, a change in the matrix phase from h- tod-alumina was also observed as a result of the coarsening reaction. It is believedthat in the nanocomposite regions, the h-alumina phase was stabilized by thelower interfacial energy between the copper (110) platelets and the matrix.",
author = "Kracum, {Michael Robert} and Marvel, {Christopher J.} and Mihaela Albu and Ferdinand Hofer and Harmer, {Martin P.} and Helen Chan",
year = "2018",
doi = "10.1111/jace.15801",
language = "English",
volume = "101",
pages = "5801",
journal = "Journal of the American Ceramic Society",
issn = "0002-7820",
publisher = "Wiley-Blackwell",
number = "12",

}

TY - JOUR

T1 - Copper-alumina nanocomposites derived from CuAlO2: Phase transformation and microstructural coarsening

AU - Kracum, Michael Robert

AU - Marvel, Christopher J.

AU - Albu, Mihaela

AU - Hofer, Ferdinand

AU - Harmer, Martin P.

AU - Chan, Helen

PY - 2018

Y1 - 2018

N2 - Partial reduction of bulk CuAlO2 results in hierarchical structures wherein thereare copper-alumina regions with widely differing morphologies and scale. At thefinest level, the distribution of the 2 phases is at the nanoscale. By means ofatomic resolution STEM and electron diffraction, the nanocomposite regions wereshown to consist of a dense array of metallic copper platelets dispersed in amatrix of h-Al2O3. The copper nanoplatelets were single crystal, and they allexhibited the same orientation relationship with the matrix, namely [110]Cu//[010]h-Al2O3, (111)Cu//(4 0 2)h-Al2O3. It was shown that the 2-phase regions wherethe copper exhibited a significantly coarser, globular morphology, resulted fromdiscontinuous coarsening. Interestingly, a change in the matrix phase from h- tod-alumina was also observed as a result of the coarsening reaction. It is believedthat in the nanocomposite regions, the h-alumina phase was stabilized by thelower interfacial energy between the copper (110) platelets and the matrix.

AB - Partial reduction of bulk CuAlO2 results in hierarchical structures wherein thereare copper-alumina regions with widely differing morphologies and scale. At thefinest level, the distribution of the 2 phases is at the nanoscale. By means ofatomic resolution STEM and electron diffraction, the nanocomposite regions wereshown to consist of a dense array of metallic copper platelets dispersed in amatrix of h-Al2O3. The copper nanoplatelets were single crystal, and they allexhibited the same orientation relationship with the matrix, namely [110]Cu//[010]h-Al2O3, (111)Cu//(4 0 2)h-Al2O3. It was shown that the 2-phase regions wherethe copper exhibited a significantly coarser, globular morphology, resulted fromdiscontinuous coarsening. Interestingly, a change in the matrix phase from h- tod-alumina was also observed as a result of the coarsening reaction. It is believedthat in the nanocomposite regions, the h-alumina phase was stabilized by thelower interfacial energy between the copper (110) platelets and the matrix.

U2 - 10.1111/jace.15801

DO - 10.1111/jace.15801

M3 - Article

VL - 101

SP - 5801

JO - Journal of the American Ceramic Society

JF - Journal of the American Ceramic Society

SN - 0002-7820

IS - 12

ER -