Accession Number:

ADA230202

Title:

Understanding the High Temperature Behavior of Niobium Aluminides; First Year Summary Report

Descriptive Note:

Annual Progress rept. 1 Dec 1989-30 Nov 1990

Corporate Author:

TEXAS UNIV AT AUSTIN

Personal Author(s):

• Tien, John K.

Report Date:

1990-11-08

Pagination or Media Count:

7.0

Abstract:

The mechanical and physical properties of Niobium Aluminide intermetallics for high temperature aerospace applications have been measured. NbA1 sub 3 was induction melted. Metallographic and chemical analysis has been performed to confirm the composition and microstructure. The coefficient of thermal expansion was determined. Mechanical testing included elevated temperature elastic modulus and microhardness. Continuing work will focus on applying high temperature microhardness with varying load time to creep properties. Also, ingots of the two other intermetallic phases will be received shortly, with similar characterization to follow. Near-net shape processing may be used to form test specimens. A transmission electron microscopy effort will be used to identify deformation mechanisms.

Descriptors:

• *TEST AND EVALUATION
• MICROSTRUCTURE
• PHYSICAL PROPERTIES
• HIGH TEMPERATURE
• DEFORMATION
• MODULUS OF ELASTICITY
• TIME
• ELECTRON MICROSCOPY
• TRANSMITTANCE
• AEROSPACE SYSTEMS
• COEFFICIENTS
• CREEP
• NIOBIUM
• BEHAVIOR
• CHEMICAL ANALYSIS
• METALLOGRAPHY
• INTERMETALLIC COMPOUNDS
• ALUMINIDES
• MICROHARDNESS
• NIOBIUM COMPOUNDS
• MECHANICAL PROPERTIES

Subject Categories:

• Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE