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High-performance bulk Ti-Cu-Ni-Sn-Ta nanocomposites based on a dendrite-eutectic microstructure

Published online by Cambridge University Press:  03 March 2011

Q.L. Dai ,
B.B. Sun ,
M.L. Sui ,
G. He ,
Y. Li ,
J. Eckert ,
W.K. Luo  and
E. Ma
Q.L. Dai
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
B.B. Sun
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
M.L. Sui*
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
G. He
Affiliation:
Light Materials Group, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
Y. Li
Affiliation:
Department of Materials Science, National University of Singapore, Singapore
J. Eckert
Affiliation:
Department of Materials and Geo-Sciences, Physical Metallurgy Division, Darmstadt University of Technology, D-64287 Darmstadt, Germany
W.K. Luo
Affiliation:
Department of Materials Science and Engineering, The Johns Hopkins University, Baltimore, Maryland 21218
E. Ma
Affiliation:
Department of Materials Science and Engineering, The Johns Hopkins University, Baltimore, Maryland 21218
*
a) Address all correspondence to this author. e-mail: mlsui@imr.ac.cn
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Abstract

Using a Ti–Cu–Ni–Sn–Ta alloy as an example, we demonstrate a strategy for the in situ formation of nanocomposite microstructures that can lead to simultaneous high strength and ductility. Our approach employs copper mold casting for the production of bulk alloys from the melt, and the solidification microstructure is designed to be composed of micrometer-sized ductile dendrites uniformly distributed inside a matrix of nanoscale eutectic reaction products. The nanostructured matrix is achieved at a relatively deep eutectic, which facilitates the formation of an ultrafine eutectic microstructure over a range of cooling rates. The multi-component recipe stabilizes a ductile solid solution as the toughening phase and helps to reduce the eutectic spacing down to nanoscale. The multi-phase microstructure (including phase distributions, morphologies, and interfaces) has been examined in detail using transmission electron microscopy (TEM) and high-resolution TEM. The metastable eutectic reaction and the nanoscale spacing achieved are explained using thermodynamic and solidification modeling. The benefits expected from the microstructure design are illustrated using the high strength and large plasticity observed in mechanical property tests. Our nanocomposite design strategy is expected to be applicable to many alloy systems and constitutes another example of tailoring the microstructure on nanoscale for extraordinary properties.

Keywords

MicrostructureMechanical properties

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Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 9 , September 2004 , pp. 2557 - 2566
Copyright
Copyright © Materials Research Society 2004

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