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

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.
Authors:
 [1] ;  [2]
  1. Lawrence Livermore National Lab., CA (United States)
  2. California Univ., Davis, CA (United States). Dept. of Mechanical, Aeronautical and Materials Engineering
Publication Date:
OSTI Identifier:
10190595
Report Number(s):
UCRL-JC--112108; CONF-9211268--1
ON: DE93041320
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Advances in superplasticity and superplastic forming,Chicago, IL (United States),1-5 Nov 1992; Other Information: PBD: Oct 1992
Research Org:
Lawrence Livermore National Lab., CA (United States)
Sponsoring Org:
USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; NICKEL SILICIDES; PLASTICITY; MOLYBDENUM ALLOYS; VANADIUM ALLOYS; INTERMETALLIC COMPOUNDS; MICROSTRUCTURE; CAVITATION; ANNEALING 360203; 360103; MECHANICAL PROPERTIES; MECHANICAL PROPERTIES