Polytypic phase formation in DyAl3by rapid solidification
作者:
Yan Xu,
Z. Altounian,
W. B. Muir,
期刊:
Applied Physics Letters
(AIP Available online 1991)
卷期:
Volume 58,
issue 2
页码: 125-127
ISSN:0003-6951
年代: 1991
DOI:10.1063/1.104948
出版商: AIP
数据来源: AIP
摘要:
Amorphous ribbons of AlxDy100−x, 93≳x≳85, were obtained by melt spinning. During crystallization, in addition to Al, four different metastable crystalline phases of DyAl3were observed. These phases are, in order of appearance, the high‐pressure face‐centered cubic phase, &ggr;‐DyAl3and three polytypic rhombohedral phases, &bgr;‐DyAl3, &bgr;’‐DyAl3, and &agr;’‐DyAl3. It is the first time that the &bgr;’phase in rare‐earth trialuminides and the &agr;’phase in Dy‐Al alloy system have been observed. It is shown that all these phases are associated with the polytypic packing of the hexagonal DyAl3atomic layers. The relative stability of the phases is found to be related to the hexagonal to cubic stacking ratio in the structure.
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