期刊
INTERMETALLICS
卷 11, 期 9, 页码 927-930出版社
ELSEVIER SCI LTD
DOI: 10.1016/S0966-9795(03)00121-3
关键词
ternary alloy system; crystallography; precipitates; site occupancy; diffraction (neutron)
Stable phase precipitation produces deleterious effects in the characteristics Of the martensitic transformation in shape memory alloys. In particular, the gamma(1) phase appears during heating as a primary precipitation previous to the eutectic reaction in Cu-Al-Ni alloys. Nevertheless the crystallographic structure of this gamma(1) phase in Cu-Al-Ni alloys is not well known. Neutron Powder Diffraction measurements have been performed at 546degreesC in a Cu-27.4 Al-3.6 Ni at.% alloy where two eutectic phases alpha and gamma(1) have been identified. Rietveld analysis allows determining the positions and the site occupancy of the different atoms in the gamma(1) phase. (C) 2003 Elsevier Ltd. All rights reserved.
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