Accession Number:

ADA394736

Title:

Effect of Alloying Additions on the Phase Equilibria and Oxidation in the Mo-Si-B System

Descriptive Note:

Interim rept. 30 Jun 1998-30 Jun 2000

Corporate Author:

UES INC DAYTON OH

Personal Author(s):

Report Date:

2001-04-01

Pagination or Media Count:

46.0

Abstract:

The Mo-Si-B alloys containing the Mo metal phase in equilibrium with the Mo3Si and Mo5SiB2 intermetallic phases have potential as hot-section materials for jet engines. For high-pressure turbine blade application, the ternary Mo-Si-B compositions exhibit adequate oxidation resistance in the temperature range of 1000 to 1300 deg C, but below 1000 deg C, the oxidation resistance is not good. The present study was undertaken to explore the effect of a number of alloying additions to a ternary Mo-Si-B Base on improving the oxidation resistance. Microstructures and phase equilibria were determined at selected temperatures of quaternary and quinary alloys. The elements added were W, Nb, V, Cr, Re, Ge, Al, Hf and Ti Cr. These alloys did not produce a better oxidation resistance-composition than the base ternary Mo-Si-B alloy.

Subject Categories:

  • Metallurgy and Metallography
  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE