In situ XRD studies on Al–Ni and Al–Ni–Sr alloys prepared by rapid solidification
In this paper the structure and stability of Al–17 wt.%Ni(Al–17Ni) and Al–17 wt.%Ni–2 wt.%Sr alloys prepared by rapid solidification was investigated by means of XRD techniques. Our work demonstrates that both alloys are crystalline and composed of fcc (Al–Ni) solid solution and orthorhombic Al 3Ni...
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Published in | Journal of alloys and compounds Vol. 464; no. 1; pp. 95 - 100 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Lausanne
Elsevier B.V
22.09.2008
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | In this paper the structure and stability of Al–17
wt.%Ni(Al–17Ni) and Al–17
wt.%Ni–2
wt.%Sr alloys prepared by rapid solidification was investigated by means of XRD techniques. Our work demonstrates that both alloys are crystalline and composed of fcc (Al–Ni) solid solution and orthorhombic Al
3Ni phases. The ternary alloy shows in addition the presence of small amount of tetragonal Al
4Sr phase. In situ XRD experiment demonstrates the stability of the solute solution up to 650
°C, Al
3Ni above 750
°C while Al
4Sr overcomes melting of the major phases at 800
°C. High-temperature structure analysis proved strong bindings between Al and Ni atoms in Al
3Ni phase, corroborating its covalent nature, linear and faster increase of the fcc volume with annealing temperature. The linear correlation between constituting atoms decreases with increase of the temperature.
The work also documents the applicability of pair distribution function (PDF) analysis to the study of multiphase crystalline systems. |
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ISSN: | 0925-8388 1873-4669 |
DOI: | 10.1016/j.jallcom.2007.10.022 |