The effect of microstructural evolution on superplasticity in Ni{sub 3}Si(V,Mo)

Conference · Thu Oct 01 04:00:00 EDT 1992

OSTI ID:10190595

Stoner, S L ^[1]; Mukherjee, A K ^[2]

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1. Lawrence Livermore National Lab., CA (United States)
2. California Univ., Davis, CA (United States). Dept. of Mechanical, Aeronautical and Materials Engineering

To further the understanding of superplasticity in intermetallics, this paper presents results of experimental investigations on an intermetallic alloy based on nickel silicide. Specifically, the evolution of the microstructure and its influence on superplastic performance is discussed. In the duplex microstructure, one phase showed grain growth, and the other, grain refinement. Cavitation occurred at interphase boundaries and final failure was by interlinkage of these cavities. Annealing the material improved the homogeneity of the microstructure. The annealed material showed improved strain rate sensitivity values and enhanced superplasticity. Microstructural features and ductility were also influenced by changing the orientation of the tensile axis. Though a transverse orientation showed more cavitation than longitudinal, it yielded greater elongation. An increased resistance to cavity coalescence in the transverse direction played a role in the enhanced ductility.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 10190595
• Report Number(s): UCRL-JC--112108; CONF-9211268--1; ON: DE93041320
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103
360203
ANNEALING
CAVITATION
INTERMETALLIC COMPOUNDS
MECHANICAL PROPERTIES
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NICKEL SILICIDES
PLASTICITY
VANADIUM ALLOYS