Accession Number:

AD0713154

Title:

EXPERIMENTAL PHASE EQUILIBRIA OF SELECTED BINARY, TERNARY, AND HIGHER ORDER SYSTEMS. PART 4. THE PHASE DIAGRAM W-B-C

Descriptive Note:

Technical rept. Apr 1967-May 1969

Corporate Author:

AEROJET-GENERAL CORP SACRAMENTO CA MATERIALS RESEARCH LAB

Personal Author(s):

Report Date:

1970-08-01

Pagination or Media Count:

62.0

Abstract:

The ternary alloy system W-B-C was investigated experimentally by means of X-ray, melting point, DTA, and metallographic techniques on hot pressed and heat treated, as well as melted specimens, and a phase diagram from 1500C through the melting range established. No ternary phases are formed in the system and the mutual solubilities between carbide and boride phases are small. The solid state sections 2000C are characterized by two-phase equilibria existing between the phase pairs W2B W2C, W2B WC, WC WB, WB C, W2B5 C, W2B5 B4C, and WB approximately 4 B4C. The two-phase equilibrium W2B WC is replaced by an equilibrium W2C WB above 2150C. Fifteen ternary isothermal reactions were found. Five are associated with pseudobinary eutectic equilibria, six with ternary eutectics, and the remaining four with class II ternary four-phase reaction isotherms.

Subject Categories:

  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE