Phase Equilibria of the Nickel-Aluminium-Chromium System at 1150°C

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Phase equilibria in the Ni-Al-Cr system at 1150°C were investigated by using annealed ternary alloys and diffusion couples. The phase constitutions, microstructures, and tie-lines were determined by conventional techniques, including X-ray diffraction, scanning electron microscopy and electron probe microanalysis. The solubility limits of Cr was found to be about 9at.% in the γ’ and 17at.% in the β phase. The size of second or third phase precipitates in the alloys was found to affect the determination of the tie-lines by the micro probe analysis.

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Periodical:

Materials Science Forum (Volumes 522-523)

Edited by:

Shigeji Taniguchi, Toshio Maruyama, Masayuki Yoshiba, Nobuo Otsuka and Yuuzou Kawahara

Pages:

103-110

DOI:

10.4028/www.scientific.net/MSF.522-523.103

Citation:

Y. Kitajima et al., "Phase Equilibria of the Nickel-Aluminium-Chromium System at 1150°C", Materials Science Forum, Vols. 522-523, pp. 103-110, 2006

Online since:

August 2006

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$35.00

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[2] N.C. Oforka, C.W. Haworth : Scand. J. Metall. vol. 16 (1987), pp.184-188.

[3] H. Okamoto : Phase Diagrams for Binary Alloys vol. 1(2000), p.29, 38, 273 � � � � � � � � � � � � � � � � %QWPVU �� �' � � � � � � � � � � � � � � � � � � � � � � � �.

[50] [0] 10 20 30 40 50.

[5] 15 25 35 45 Ni Al.

[20] [45] [40] [35] [30] [25] 1510 5 0.

[50] [55] [60] [65] [70] [75] [80] [85] [90] [95] 100 Cr γγγγ γγγγ� ββββ at. % Ni at. % Al at. % Cr (b) Tie-lines and tie-triangles obtained from Bulk alloys Diffusion couples Fig. 7. Ni-rich corner of the Ni-Al-Cr ternary phase diagrams at 1150ºC.

[50] [0] 10 20 30 40 50.

[5] 15 25 35 45.

10 20 30 40 50.

[5] 15 25 35 45 Ni Al.

[20] [45] [40] [35] [30] [25] 1510 5 0.

[50] [20] [45] [40] [35] [30] [25] 1510 5 0.

[50] [55] [60] [65] [70] [75] [80] [85] [90] [95] 100 Cr.

[55] [60] [65] [70] [75] [80] [85] [90] [95] 100 Cr γγγγ γγγγ� ββββ at. % Ni at. % Al at. % Cr (b) Tie-lines and tie-triangles obtained from Bulk alloys Diffusion couples Tie-lines and tie-triangles obtained from Bulk alloys Diffusion couples Fig. 7. Ni-rich corner of the Ni-Al-Cr ternary phase diagrams at 1150ºC.

DOI: 10.4028/www.scientific.net/msf.595-598.199

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