DOI: 10.1111/j.1365-2818.1993.tb03302.x. The measurement of local plastic deformation in a metal‐matrix composite by electron back‐scatter patterns

The measurement of local plastic deformation in a metal‐matrix composite by electron back‐scatter patterns

10.1111/j.1365-2818.1993.tb03302.x

Crossref journal-article

Wiley

Journal of Microscopy (311)

Abstract

SUMMARYHigh dislocation densities in the matrices of metal‐matrix composites (MMCs) contribute to the strengthening of particulate MMCs, whilst heterogeneous nucleation of precipitates at these defects can cause marked differences in the age hardening of many matrix alloys. Electron back‐scatter patterns (EBSPs) and transmission electron microscopy (TEM) have been used to examine the dislocation distribution in continuous‐fibre SiC/Al alloy MMCs. TEM observations showed dislocation densities as high as 3 times 1014m−2, with a marked increase as thinner matrix regions were observed. From EBSP measurements on bulk specimens, a much lower dislocation density of 2 times 1012 m−2 was estimated. To resolve this discrepancy, EBSP measurements were made from thinned TEM specimens and these showed that the dislocation density had increased during specimen thinning. However, both TEM and EBSP measurements from unreinforced matrix material prepared for TEM using the same procedures showed no such increase in dislocation density. Redistribution of internal stresses during thinning of the composite to a transparent foil must therefore be the cause of the observed rise in dislocation density. The EBSP technique was demonstrated to be an excellent means of examining the distribution of plastic deformation in MMCs. It was concluded that TEM measurements of dislocation densities in continuous‐fibre MMCs can be erroneously high.

Bibliography

WILKINSON, A. J., GONZALEZ, G., & DINGLEY, D. J. (1993). The measurement of local plastic deformation in a metalâmatrix composite by electron backâscatter patterns. Journal of Microscopy, 169(2), 255â261. Portico.

Authors 3

A. J. WILKINSON (first)
G. GONZALEZ (additional)
D. J. DINGLEY (additional)

References 15 Referenced 18

10.1016/0025-5416(86)90261-2
10.1016/0956-7151(91)90327-W
10.1007/BF00549547
10.1016/0001-6160(88)90236-2
10.1177/002199838802200904
10.1016/0304-3991(87)90148-3
{'key': 'e_1_2_1_8_1', 'first-page': '134', 'volume-title': 'Metal Matrix Composites (STP438', 'author': 'Hancock J.R.', 'year': '1968'} / Metal Matrix Composites (STP438 by Hancock J.R. (1968)
10.1016/0956-716X(91)90349-6
10.1007/BF02900252 / Metall. Trans. / Correlation of uniaxial yielding and substructure in aluminium—stainless steel composites by Pinnel M.R. (1970)
{'key': 'e_1_2_1_11_1', 'first-page': '231', 'volume-title': 'Inst. Phys. Conf. Series No. 119, Electron Microscopy and Analysis 1991', 'author': 'Prangnell P.B.', 'year': '1991'} / Inst. Phys. Conf. Series No. 119, Electron Microscopy and Analysis 1991 by Prangnell P.B. (1991)
10.1016/0001-6160(88)90120-4
{'key': 'e_1_2_1_13_1', 'first-page': '2', 'volume-title': 'Proc. 6th Int. Conf. Composite Materials', 'author': 'Rawal S.P.', 'year': '1987'} / Proc. 6th Int. Conf. Composite Materials by Rawal S.P. (1987)
{'key': 'e_1_2_1_14_1', 'first-page': '197', 'volume-title': 'Inst. Phys. Conf. Series No. 119. Electron Microscopy and Analysis 1991', 'author': 'Wilkinson A.J.', 'year': '1991'} / Inst. Phys. Conf. Series No. 119. Electron Microscopy and Analysis 1991 by Wilkinson A.J. (1991)
10.1016/0956-716X(92)90617-N
10.1016/0956-7151(91)90037-2

Dates

Type	When
Created	14 years ago (Aug. 2, 2011, 8:16 a.m.)
Deposited	1 year, 9 months ago (Oct. 25, 2023, 8 a.m.)
Indexed	1 year, 9 months ago (Oct. 26, 2023, 3:14 a.m.)
Issued	32 years, 6 months ago (Feb. 1, 1993)
Published	32 years, 6 months ago (Feb. 1, 1993)
Published Online	14 years ago (Aug. 2, 2011)
Published Print	32 years, 6 months ago (Feb. 1, 1993)

Funders 0

None

BibTeX

@article{WILKINSON_1993, title={The measurement of local plastic deformation in a metal‐matrix composite by electron back‐scatter patterns}, volume={169}, ISSN={1365-2818}, url={http://dx.doi.org/10.1111/j.1365-2818.1993.tb03302.x}, DOI={10.1111/j.1365-2818.1993.tb03302.x}, number={2}, journal={Journal of Microscopy}, publisher={Wiley}, author={WILKINSON, A. J. and GONZALEZ, G. and DINGLEY, D. J.}, year={1993}, month=feb, pages={255–261} }

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