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Effect of Sn on microstructure and mechanical properties of Ti-Fe-(Sn) ultrafine eutectic composites

Published online by Cambridge University Press:  31 January 2011

Jayanta Das ,
Ralf Theissmann ,
Wolfgang Löser  and
Jurgen Eckert
Jayanta Das*
Affiliation:
Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur 721 302, West Bengal, India
Ralf Theissmann
Affiliation:
Universität Duisburg–Essen, Fakultät für Ingenieurwissenschaften und CeNIDE, 47057 Duisburg, Germany
Wolfgang Löser
Affiliation:
Leibniz–Institut für Festkörper– und Werkstoffforschung Dresden (IFW), D 01069 Dresden, Germany
Jurgen Eckert*
Affiliation:
Leibniz–Institut für Festkörper– und Werkstoffforschung Dresden (IFW), D 01069 Dresden, Germany; and Technische Universität Dresden, Institut für Werkstoffwissenschaft, D-01069 Dresden, Germany
*
a)Address all correspondence to this author. e-mail: j.das@metal.iitkgp.ernet.in
b)This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/jmr_policy
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Abstract

High strength (Ti0.705Fe0.295)100-xSnx (0 ≤ x ≤ 6) composites have been prepared through arc melting and cold crucible casting. The microstructure consists of two phase ultrafine eutectic comprised of FeTi and β-Ti phases. The effect of Sn addition to the Ti70.5Fe29.5 eutectic is assessed in terms of microstructure variations such as eutectic spacing, morphology, cell size, lattice parameter of the phases, and the resulting mechanical properties in terms of strength and plasticity under compression. The mechanical properties (maximum strength 1939 MPa, fracture strain 13.5%) of the ternary Ti-Fe-Sn (2 ≤ x ≤ 6) are considerably improved compared to the Ti70.5Fe29.5 binary alloy (1733 MPa, 3.4%). The change in the morphology of the eutectic, the microstructure refinement, structural fluctuations, and supersaturation in the β-Ti phase, and the elastic properties of nanophases are crucial factors for improving the plastic deformability of the ultrafine eutectic alloys without presence of any additional micrometer-size toughening phase.

Keywords

CompositeElastic propertiesNanostructure
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 5 , May 2010 , pp. 943 - 956
Copyright
Copyright © Materials Research Society 2010

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