Development of niobium aluminide-based composites with improved toughness using treated reinforcements

Journal Article · Fri Mar 01 04:00:00 EST 1996 · Acta Materialia

DOI:https://doi.org/10.1016/1359-6454(95)00241-3· OSTI ID:215391

Woytera, S A; Bhagat, R B; Amateau, M F ^[1]

---

1. Pennsylvania State Univ., University Park, PA (United States). Applied Research Lab.

Many ordered intermetallic compounds exhibit attractive properties for high temperature structural aerospace applications. The major obstacles limiting the use of these materials are their low ductility and toughness at room temperature and poor creep resistance at elevated temperatures. In this investigation treated silicon carbide whisker and niobium particle reinforced niobium aluminide matrix composites have been fabricated by reaction hot pressing in vacuum. Elemental matrix powders react exothermally and form the niobium aluminide matrix in situ. A suitable hot pressing cycle has been established for the successful development of the niobium aluminide matrix, while reducing adverse reactions between the matrix and the reinforcements. The composites with treated reinforcements are expected to have high resistance to creep at elevated temperatures and they show relatively low hardness and higher toughness in comparison with the composites reinforced with untreated whiskers.

• OSTI ID: 215391
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 3 Vol. 44; ISSN XZ504Y; ISSN 1359-6454
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AEROSPACE INDUSTRY
ALUMINIUM ALLOYS
CHEMICAL REACTIONS
COMPOSITE MATERIALS
CREEP
DUCTILITY
FRACTURE PROPERTIES
HARDNESS
HOT PRESSING
IN-SITU PROCESSING
INTERMETALLIC COMPOUNDS
NIOBIUM
NIOBIUM ALLOYS
PARTICULATES
POWDERS
SILICON CARBIDES
WHISKERS