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A Study of Internal Damage of Metal Matrix Composites by Neutron Diffraction

Published online by Cambridge University Press:  22 February 2011

N. Shi ,
M. A. M. Bourke  and
J. A. Goldstone
N. Shi
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
M. A. M. Bourke
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
J. A. Goldstone
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
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Abstract

Using neutron diffraction, we have measured the elastic phase strains of Al/TiC and Al/SiC composites under uniaxial tensile loading. The phase strains were used to reconstruct the global elastic strain. It has been found that, above macroscopic yield, the global elastic strain response is not linear. A theoretical model shows that the nonlinearity is dictated by changes in the ratio of longitudinal phase stresses. Furthermore, the changes in this ratio resulting from matrix plasticity and reinforcement fracture are different which leads to distinct slope changes in the global elastic strain response that can be used to distinguish the onset of these two processes on the global elastic strain loading curve.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 376: Symposium BB – Neutron Scattering in Materials Science , 1994 , 441
Copyright
Copyright © Materials Research Society 1995

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References

REFERENCES

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