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Deformation Behavior of Polycrystalline Nial Cyclicly Deformed Near the Brittle-to-Ductile Transition Temperature

Published online by Cambridge University Press:  01 January 1992

Cheryl L. Cullers ,
Stephen D. Antolovich  and
Ronald D. Noebe
Cheryl L. Cullers
Affiliation:
Georgia Institute of Technology, Atlanta, GA
Stephen D. Antolovich
Affiliation:
presently at Washington State University, Pullman, WA
Ronald D. Noebe
Affiliation:
NASA Lewis Research Center, Cleveland, OH.
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Abstract

Low cycle fatigue (LCF) behavior of polycrystalline NiAl was investigated near the monotonic brittle-to-ductile transition temperature (BDTT) at plastic strain ranges of 0.5 and 1.0%. Between 600 and 700 K, NiAl exhibited rapid hardening for the first few cycles followed by a stress plateau and a subsequent return to hardening. Slip traces were observed on the gage surfaces of most LCF specimens using scanning electron microscopy (SEM). The fatigue properties in this intermediate temperature range (600 to 700 K) were found to be a logical transition between previously reported ambient and elevated temperature properties. Transmission electron microscopy (TEM) confirmed that the dislocations had typical <100> Burgers vectors. A cellular dislocation structure began developing before saturation was achieved. This structure transformed at longer lives to elongated cells and eventually to veins of dislocation tangles. The resulting dislocation morphology did not change from 600 to 700 K, but the dislocation density decreased noticeably.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 531
Copyright
Copyright © Materials Research Society 1995

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References

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