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Enhanced densification of Ti-6Al-4V/TiC powder blends by transformation mismatch plasticity

Published online by Cambridge University Press:  10 May 2013

Bing Ye ,
Marc R. Matsen  and
David C. Dunand
Bing Ye
Affiliation:
National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; and Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
Marc R. Matsen
Affiliation:
Boeing Research and Technology, The Boeing Company, Seattle, Washington 98124
David C. Dunand*
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
*
a)Address all correspondence to this author. e-mail: dunand@northwestern.edu
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Abstract

Ti-6Al-4V alloy with attractive properties such as corrosion resistance and high specific strength has a broad impact on daily life in the field of aerospace and medicine. The addition of TiC to Ti-6Al-4V is to further improve abrasion resistance and hardness. To have a low processing cost and precise control of the TiC volume fraction and distribution, the composite is densified with a blend of Ti-6Al-4V and TiC powders through a powder metallurgy route. The densification kinetics of the blend is studied for uniaxial die pressing (i) under isothermal conditions at 1020 °C, where β-Ti-6Al-4V deforms by creep and (ii) upon thermal cycling from 860 to 1020 °C, where the α-β transformation leads to transformation superplasticity. Densification curves for both isothermal and thermal cycling for various applied stresses and TiC fractions are in general agreement with predictions from continuum models and finite element simulation models performed at the powder level.

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Articles
Information
Journal of Materials Research , Volume 28 , Issue 17: Focus Issue: Advances in the Synthesis, Characterization, and Properties of Bulk Porous Materials , 14 September 2013 , pp. 2520 - 2527
Copyright
Copyright © Materials Research Society 2013 

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