Accession Number:

ADA285262

Title:

Processing - Property Relationship in Advanced Intermetallics

Descriptive Note:

Final rept. 4 Mar 1991-3 Mar 1994

Corporate Author:

ROCKWELL INTERNATIONAL CORP THOUSAND OAKS CA SCIENCE CENTER

Personal Author(s):

Report Date:

1994-07-01

Pagination or Media Count:

67.0

Abstract:

The feasibility of using the exothermic reaction between Mo and Si for the synthesis of MoSi2 has been demonstrated. The reaction-HIP process begins with high purity elemental powder and produces a low oxygen, fully-dense MoSi2 with a grain size of approx. 40 micrometers. All of the powder handling steps were done in a low oxygen, inert gas environment to explore the limits of the precautions that are necessary to eliminate Si02 contamination. Compression testing of reactively HIP processed material showed that this material enjoys a strength advantage over material processed by HIP from commercial powder. The compression testing was done as a function of temperature, in the range 1200-1450 deg C, and of strain rate, in the range 10exp-3 to 10exp-5 per second. The deformation mechanism was determined to be a combination of microcracking and dislocation glideclimb. Large strain deformation resulted in dynamic of the recrystallization MoSi2. Backscatter SEM and EM were used to characterize the deformed microstructures.

Subject Categories:

  • Industrial Chemistry and Chemical Processing
  • Inorganic Chemistry
  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE