期刊
INTERMETALLICS
卷 8, 期 3, 页码 247-257出版社
ELSEVIER SCI LTD
DOI: 10.1016/S0966-9795(99)00100-4
关键词
rare-earth intermetallics; aluminides, miscellaneous; ternary alloy systems; phase diagram; microstructure
The Al-rich region of the Y-Ni-Al ternary system has been investigated mainly by using different micrographic techniques. In the range 60 < at% Al < 100 the 500 degrees C isothermal section has been partially defined. The compound Y4Ni6Al23 and its role in phase equilibria have been highlighted. The YNi3Al16 phase previously suggested has not been confirmed. Two ternary tie-triangles in this region have also been defined: Al + NiAl3 + Y4Ni6Al23 and Al + YAl3 + Y4Ni6Al23. Two ternary eutectic equilibria: El, Ni-rich: at about 96.5 at% Al, 2.6 at% Ni, 0.9 at% Y and E-2, Y-rich: at about 96.0 at% Al, 1.0 at% Ni, 3.0 at% Y have been identified. The crystallization behaviour of the Al-rich alloys is described and typical micrographic appearances presented. (C) 2000 Elsevier Science Ltd. All rights reserved.
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