Accession Number:

ADA210658

Title:

Exploratory Study of Niobium, Titanium, Zirconium and Tantalum Aluminides

Descriptive Note:

Final rept. 1 Mar 1988-31 May 1989

Corporate Author:

RENSSELAER POLYTECHNIC INST TROY NY DEPT OF MATERIALS ENGINEERING

Personal Author(s):

• Stoloff, Norman S.

Report Date:

1989-07-01

Pagination or Media Count:

24.0

Abstract:

The microstructure, crystal structures of existing phases, hardness and slip systems for several binary and ternary aluminides have been determined. Arc melted samples purchased from an external supplier invariably cracked upon cooling in the arc melting unit, thereby hampering the ability to prepare mechanical test specimens. Homogenization heat treatments in vacuum usually led to significant porosity, apparently due to loss of aluminum. The properties of arc melted material are compared to those derived from similar compositions prepared by powder metallurgical techniques.

Descriptors:

• *NIOBIUM
• *ALUMINIDES
• *TANTALUM
• *TITANIUM
• *ZIRCONIUM
• POROSITY
• HEAT TREATMENT
• ALUMINUM
• ARC MELTING
• POWDER METALLURGY
• MECHANICAL PROPERTIES
• LOSSES
• COOLING
• VACUUM
• CRYSTAL STRUCTURE
• MICROSTRUCTURE
• HOMOGENEITY

Subject Categories:

• Properties of Metals and Alloys
• Crystallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE