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Work-hardening mechanisms of the Ti60Cu14Ni12Sn4Nb10 nanocomposite alloy

Published online by Cambridge University Press:  31 January 2011

Amadeu Concustell ,
Jordi Sort ,
Jordina Fornell ,
Emma Rossinyol ,
Santiago Suriñach ,
Annett Gebert ,
Jurgen Eckert  and
M. Dolors Baró
Amadeu Concustell*
Affiliation:
Departament de Física, Facultat de Ciències, Edifici Cc, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
Jordi Sort
Affiliation:
Institució Catalana de Recerca i Estudis Avançats and Departament de Física, Facultat de Ciències, Edifici Cc, Universitat Autònoma de Barcelona, 08193 Bellaterra,Barcelona, Spain
Jordina Fornell
Affiliation:
Departament de Física, Facultat de Ciències, Edifici Cc, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
Emma Rossinyol
Affiliation:
Servei de Microscopia, Facultat de Ciències, Edifici Cs, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
Santiago Suriñach
Affiliation:
Departament de Física, Facultat de Ciències, Edifici Cc, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
Annett Gebert
Affiliation:
IFW Dresden, Institute for Metallic Materials, D-01171 Dresden, Germany
Jurgen Eckert*
Affiliation:
IFW Dresden, Institute for Complex Materials, D-01171 Dresden, Germany; and TU Dresden, Institute of Materials Science, D-01062 Dresden, Germany
M. Dolors Baró
Affiliation:
Departament de Física, Facultat de Ciències, Edifici Cc, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
*
a) Address all correspondence to this author. e-mail: ac600@cam.ac.uk
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

The work-hardening mechanisms of the Ti60Cu14Ni12Sn4Nb10 nanocomposite alloy were studied. This material is composed of micrometer-sized dendrites embedded in a nanostructured eutectic matrix and a CuTi2 intermetallic phase. Our study shows that, in the as-quenched state, the nanostructured eutectic matrix behaves softer than the dendrites. During mechanical deformation, both the dendrites and the eutectic matrix harden, whereas the hardness of the CuTi2 intermetallic phase remains unaltered. The high strength of the dendrites is caused by the interplay between solid solution hardening and dislocation networks during plastic flow. Interestingly, the mechanical hardening of the nanoeutectic matrix is also assisted by a martensitic transformation of the NiTi phase. Transmission electron microscopy studies clearly show that the martensitic transformation of this phase is accompanied with grain size refinement, which also plays a role in the deformation-induced mechanical hardening.

Keywords

Nano-indentationTiTransmission electron microscopy (TEM)
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 10 , October 2009 , pp. 3146 - 3153
Copyright
Copyright © Materials Research Society 2009

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