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Microstructures and mechanical properties of V–V3Si eutectic composites

  • H. Bei , E. P. George EMAIL logo , E. A. Kenik and G. M. Pharr
Published/Copyright: February 14, 2022
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Abstract

V–V3Si eutectic alloys were directionally solidified in a high temperature optical floating zone furnace. Depending on the solidification conditions, several microstructures were observed, such as well-aligned broken lamellar, fibrous, or cellular microstructures. The interphase spacings increased with decreasing solidification rates in agreement with the Jackson-Hunt theory. The mechanical properties of the individual phases were investigated by nanoindentation. It was found that the modulus and nanoindentation hardness of V3Si are 214 and 13.8 GPa, respectively, and those of the V solid-solution are 165 and 3.4 GPa, respectively. The high-temperature strength was examined by tensile testing at elevated temperatures. Preliminary results show that the ductile-to-brittle transition temperature is about 800 °C for this composite, and its strength is significantly higher than conventional V solid-solution alloys.


Dedicated to Professor Dr. Peter Neumann on the occasion of his 65th birthday

Prof. Easo P. George Oak Ridge National Laboratory Metals and Ceramics Division 1 Bethel Valley Road Oak Ridge, TN 37831-6093 USA Tel.: +1 865 574 5085 Fax: +1 865 576 3881

  1. This research was sponsored by the Division of Materials Sciences and Engineering, Office of Basic Energy Sciences, U. S. Department of Energy, and the SHaRE Collaborative Research Center at Oak Ridge National Laboratory, under contract DE-AC05–00OR22725 with UT-Battelle, LLC.

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Received: 2004-01-05
Accepted: 2004-02-02
Published Online: 2022-02-14
Published in Print: 2022-02-14

© 2004 Carl Hanser Verlag, München

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