Accession Number:

AD0849163

Title:

Characterization of the Hexagonal-Close-Packed Intermetallic Compound from the Mo-Rh, Mo-Ir, and Mo-Pt Systems

Descriptive Note:

Technical rept.

Corporate Author:

CLIMAX MOLYBDENUM CO OF MICHIGAN ANN ARBOR

Personal Author(s):

Report Date:

1969-01-01

Pagination or Media Count:

47.0

Abstract:

The results of an investigation of the hexagonal-close-packed intermetallic compound found in the Mo-Rh, Mo-Ir, and Mo-Pt systems are reported. The compound was characterized by determining room and elevated- temperature hardness values, room-temperature electrical resistivity, oxidation resistance during exposure to air at 538 C 1000 F and 982 C 1800 F, and corrosion resistance to aqueous solutions containing 41.6 or 70.9 nitric acid. The room-temperature hardness of the compound is reported to range between 300 and 675 DPH and is inversely proportional to the molybdenum content of the alloy. The molybdenum-iridium alloys are harder than the sapphire indentor at test temperatures between 1093 and 1649 C 2000 and 3000 F. The oxidation resistance of the alloys at 538 C 1000 F decreases as the molybdenum content increases. Only the 80 Rh -20 Mo alloy resisted oxidation at 982 C 1800 F during a 10-hour exposure. All the alloys resist corrosion by dilute and concentrated nitric acid.

Subject Categories:

  • Properties of Metals and Alloys
  • Crystallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE