Reinforcement/matrix interaction in Al{sub 2}O{sub 3} and Al{sub 2}O{sub 3}-ZrO{sub 2} fiber-reinforced Ni{sub 3}Al matrix composites
Journal Article
·
· Acta Materialia
- Michigan Technological Univ., Houghton, MI (United States). Dept. of Metallurgical and Materials Engineering
The interfacial reaction characteristics of fibers with nickel aluminide (Ni{sub 3}Al) matrices have been investigated after consolidation by hot isostatic pressing (HIPing) and after post-consolidation heat treatment. Two matrix alloys have been studied: Ni{sub 3}Al alloyed with 0.6 wt.% Zr-(IC-50) and Ni{sub 3}Al alloyed with 8 wt.% Cr, 2.8 wt.% Mo and 0.6 Wt.% Zr (IC-396). Pure alumina (FP) and alumina-zirconia (PRD-166) reinforcements, in the form of discontinuous fibers, were added to the Ni{sub 3}Al alloys. Elemental compositions across the reaction zone have been analyzed quantitatively using scanning electron microscopy (SEM), electron microprobe analysis (EMPA) and Auger electron spectroscopy (AES). The results show that all composites HIPed at 900 C have residual porosity, but no chemical interactions between matrix and reinforcements were detected. At the other extreme, while full density was achieved at 1200 C, significant formation of zirconium rich precipitates was observed at the fiber/matrix. Fiber clustering, fiber breakage and fiber/matrix debonding occurred during HIPing processes. Solid-state reactions between fibers and matrices were studied after heat treating the HIPed composites at 950 C, 1050 C and 1150 C for times ranging from 1 to 100 hours. The reaction zone increased with time and temperature. Ni and Zr (and, when present, Cr and Mo) diffused from the matrix toward the reaction zone. Zr is believed to be responsible for the strong chemical reaction between fiber and matrix.
- OSTI ID:
- 514669
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 6 Vol. 45; ISSN 1359-6454; ISSN ACMAFD
- Country of Publication:
- United States
- Language:
- English
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