Microstructure and compressive properties of in situ composite (Ni-40Al-10Ti)-(0, 20%)TiC

• Published in: Journal of materials science letters Vol. 19; no. 2; pp. 115 - 117
• Main Authors: JIANG, D. T, GUO, J. T, SHI, C. X, LIN, D. L
• Format: Journal Article
• Language: English
• Published: Dordrecht Kluwer Academic Publishers 01.01.2000
• Subjects: Applied sciences; Cross-disciplinary physics: materials science; rheology; Dispersion-, fiber-, and platelet-reinforced metal-based composites; Elasticity and anelasticity; Elasticity and anelasticity, stress-strain relations; Exact sciences and technology; Materials science; Metals. Metallurgy; Other materials; Physics; Specific materials; Treatment of materials and its effects on microstructure and properties; Titanium alloys; Composite materials; Nickel alloys; Aluminium alloys; Yield strength; SEM; Titanium carbides; Experimental study; Microstructure; TEM; Transition element alloys
• ISSN: 0261-8028
• DOI: 10.1023/A:1006691212467

A novel in-situ composite (Ni-40Al-10Ti)-TiC was successfully manufactured from elemental powders by using the reaction synthesis technique. The microstructure and compressive properties of the composites were studied. There exists a large amount of Heusler precipitates (Ni2AlTi) that distribute regularly in NiAl grains. TiC particles have a tendency to reside on the grain boundaries. The composites show very high strength even at elevated temperatures but little ductility at low temperatures. The strength of Ni-40Al-10Ti is 5 times that of monolithic NiAl at 1000 C. Both the improved strength and limited ductility can be related to the needle-like Heusler precipitates. The incorporation of TiC particles is beneficial to the ductility; on the other hand, it leads to a decrease in strength of the composite. 11 refs.