Microstructure and mechanical behavior of the NiAl-TiC in situ composite

Journal Article · Tue Apr 01 04:00:00 EST 1997 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/s11661-997-0237-9· OSTI ID:484854

Xing, Z P; Han, Y F ^[1]; Guo, J T; Yu, L G ^[2]

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1. Inst. of Aeronautical Materials, Beijing (China)
2. Chinese Academy of Sciences, Shenyang (China). Inst. of Metal Research

The microstructure, interfaces, and mechanical properties of NiAl-matrix composites reinforced by 0 and 20 vol pct TiC particles have been examined. The composites were prepared by the hot-press-aided exothermic synthesis (HPES) technique. Portions of the HPES-processed samples were hot isostatically pressed (hipped) at 1,165 C/150 MPa for 4 hours or annealed at 1,400 C for 48 hours. In the as-fabricated state, TiC particles were generally polygonal and faceted, and the interfaces between TiC and NiAl were atomically flat, sharp, and generally free from any interfacial phase. At least two orientation relationships between TiC and NiAl were observed. In some cases, thin amorphous layers existed at NiAl/TiC interfaces. After Hipping, the TiC particles tended to become round and the TiC/NiAl interfaces became overlapped. Annealing at 1,400 C for 48 hours did not affect the microstructure or the interfacial structure of the composite in most cases. The compressive yield strengths (YSs) from room temperature to 1,100 C of the composite were considerably higher than that of the monolithic NiAl at 980 C, the tensile YS of the composite was approximately 3 times that of the monolithic NiAl. In addition, the ambient fracture toughness of the composite was 50 pct higher than that of the monolithic NiAl.

• Sponsoring Organization: National Natural Science Foundation of China, Beijing, BJ (China)
• OSTI ID: 484854
• Journal Information: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 4 Vol. 28; ISSN 1073-5623; ISSN MMTAEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
ANNEALING
COMPOSITE MATERIALS
CONCENTRATION RATIO
FRACTURE PROPERTIES
HOT PRESSING
INTERFACES
MECHANICAL PROPERTIES
MICROSTRUCTURE
NICKEL ALLOYS
ORIENTATION
PARTICULATES
YIELD STRENGTH