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Experimental Study of Mobile Dislocation Densities and Velocities through Transient Mechanical Tests

Published online by Cambridge University Press:  10 February 2011

B. Lo Piccolo ,
J.L. Martin  and
J. Bonneville
B. Lo Piccolo
Affiliation:
Physics Department, Ecole Polytechnique Féérale, CH 1015 Lausanne, Switzerland
J.L. Martin
Affiliation:
Physics Department, Ecole Polytechnique Féérale, CH 1015 Lausanne, Switzerland
J. Bonneville
Affiliation:
Laboratoire de Métallurgie Physique, Université de Poitiers, SP2MI, Bd 3-Té1éport 2 - B.P. 179, F 86960 Futuroscope Cedex
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Abstract

The use of transient mechanical tests such as repeated load relaxations and repeated creep tests provide some insight on the respective contribution of mobile dislocation densities and velocities to the plastic strain-rate and also on the hardening mechanisms. Improvements of the second technique are reported as well as results on Ni3Al polycrystals. Other materials (e.g. Cu, TiAl) are considered for comparison. Correlations are found between dislocation exhaustion rates, workhardening coefficients and the amplitude of yield point at reloading after the relaxations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 578: Symposia A/C – Multiscale Phenomena in Materials - Experiments in Modeling , 1999 , 21
Copyright
Copyright © Materials Research Society 2000

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References

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