Softening mechanisms and microstructural instabilities during high temperature low cycle fatigue of Ni, Ni/sub 3/Al and their metal matrix composites: Progress report, June 1, 1988--May 31, 1989
The microstructural development and mechanical behavior associated with high temperature low cycle fatigue were investigated and modeled. Fatigue crack growth during high temperature low cycle fatigue was accompanied by dynamic recrystallization, but dynamic recrystallization did not interfere with the propagation of cracks along cavitated boundaries. The occurrence of dynamic recrystallization in Ni/sub 3/Al was evidenced by high temperature compression tests. Preliminary results of computer simulation of high temperature cyclic deformation indicate that the extensive microstructural changes during high temperature low cycle fatigue can be successfully modeled by SIBM and orientation dependent grain boundary sliding. The recrystallization texture development in Ni/sub 3/Al is governed by fast growing orientations with 25/degree/<100> orientation relationship between growing and consumed grains. MMCs with Ni/sub 3/Al(B) matrix and Al/sub 2/O/sub 3/ continuous fiber reinforcement have been successfully produced by vacuum hot pressing. Together with Siemens/Nicolet a fully automatic orientation mapping system with synchrotron radiation has been assembled and will be tested in April 1989.
- Research Organization:
- Michigan State Univ., East Lansing (USA)
- DOE Contract Number:
- FG02-85ER45205
- OSTI ID:
- 6592966
- Report Number(s):
- DOE/ER/45205-4; ON: DE89007117
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Dynamic recrystallization during high temperature low cycle fatigue of nickel: Progress report, June 1, 1985-May 31, 1988
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Related Subjects
ALUMINIUM
RECRYSTALLIZATION
NICKEL
ALUMINIUM OXIDES
COMPUTERIZED SIMULATION
CRACK PROPAGATION
FATIGUE
GRAIN BOUNDARIES
GRAIN SIZE
MICROSTRUCTURE
PROGRESS REPORT
REINFORCED MATERIALS
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CRYSTAL STRUCTURE
DOCUMENT TYPES
ELEMENTS
MATERIALS
MECHANICAL PROPERTIES
METALS
OXIDES
OXYGEN COMPOUNDS
SIMULATION
SIZE
TRANSITION ELEMENTS
360602* - Other Materials- Structure & Phase Studies
360603 - Materials- Properties