Determination of the constitution of the quasi-binary eutectic NiAl-Re system by DTA and microstructural investigations

被引：28

作者：

Rablbauer, R ^{[1
]}

Frommeyer, G ^{[1
]}

Stein, F ^{[1
]}

机构：

[1] Max Planck Inst Eisenforsch GmbH, D-40237 Dusseldorf, Germany

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2003年 / 343卷 / 1-2期

关键词：

NiAl; rhenium; quasi-binary eutectic; irregular eutectic; phase diagram; unidirectional solidification;

D O I：

10.1016/S0921-5093(02)00388-X

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The constitution of the quasi-binary eutectic NiAl-Re section of the ternary Al-Ni-Re phase diagram was reinvestigated by using differential thermal analysis, metallography and scanning electron microscopy. The alloys studied were stoichiometric NiAl and various NiAl-Re, (0.75 < x < 2.5 at.%) alloys. The microstructure of the as-cast NiAl-Re eutectic is of irregular fibrous morphology. Ingots with Re concentrations greater than or equal to 1.25 at.% reveal non-equilibrium microstructures which consist of primary Re crystals, NiAl crystals, and eutectic. An ideal eutectic microstructure was achieved by unidirectional solidification of a NiAl-Re-1.25 alloy using Bridgman technique at a low growth velocity of 30 mm h(-1). The melting temperature of the stoichiometric NiAl compound is 1674 degreesC. The eutectic point of the quasi-binary section of the NiAl-Re system is determined to be at 1.25 at.% Re and a temperature of 1668 degreesC. The solidus temperatures of the NiAl-Re ingots exhibit a slight dependence on the Re concentration. The solid solubility of Re in NiAl is 0.6 at.% at the eutectic temperature and 0.2 at.% at 1300 degreesC. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：301 / 307

页数：7

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