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Hardness–depth profile of a carbon-implanted Ti–6Al–4V alloy and its relation to composition and microstructure

Published online by Cambridge University Press:  31 January 2011

M. Kunert ,
O. Kienzle ,
B. Baretzky ,
S. P. Baker  and
E. J. Mittemeijer
M. Kunert
Affiliation:
Max Planck Institute for Metals Research, Seestrasse 92, 70174 Stuttgart, Germany
O. Kienzle
Affiliation:
Max Planck Institute for Metals Research, Seestrasse 92, 70174 Stuttgart, Germany
B. Baretzky
Affiliation:
Max Planck Institute for Metals Research, Seestrasse 92, 70174 Stuttgart, Germany
S. P. Baker
Affiliation:
Department of Materials Science and Engineering, Cornell University, 129 Bard Hall, Ithaca, New York 14853–1501
E. J. Mittemeijer
Affiliation:
Max Planck Institute for Metals Research, Seestrasse 92, 70174 Stuttgart, Germany
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Abstract

The variation of mechanical properties (hardness, indentation modulus) within a carbon-implanted region of a Ti–6Al–4V alloy—about 350-nm thick—was, for the first time, related with the microstructure and the chemical composition with a depth accuracy as small as ±20 nm. Microstructure, chemical composition, and mechanical properties of the implanted alloy were determined using transmission electron microscopy, Auger electron spectroscopy, and nanoindentation, respectively. The microstructure within the implanted region contains TiC precipitates, the density of which changes with depth in accordance with the carbon content. The hardness depends on the precipitate density: the maximum hardness occurs at the depth where an almost continuous TiC layer had formed. The depth profiles of hardness and indentation modulus were measured using three different methods: the cross-section method (CSM); the constant-load method (CLM); and the load-variation method (LVM). Only the hardness– depth profile obtained using the CSM, in which the indentations are performed perpendicular to the hardness gradient on a cross section of the specimen, reflects the microstructural variations present in the implanted region.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 8 , August 2001 , pp. 2321 - 2335
Copyright
Copyright © Materials Research Society 2001

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