Work-hardening mechanisms of the Ti<inf>60</inf>Cu<inf>14</inf>Ni <inf>12</inf>Sn<inf>4</inf>Nb<inf>10</inf> nanocomposite alloy

Amadeu Concustell, Jordi Sort, Jordina Fornell, Emma Rossinyol, Santiago Suriñach, Annett Gebert, Jurgen Eckertb, M. Dolors Baró

Research output: Contribution to journalArticleResearchpeer-review

9 Citations (Scopus)

Abstract

The work-hardening mechanisms of the Ti60Cu14Ni 12Sn14Nb10 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 CuTi 2 intermetallic phase runaltered. 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. © 2009 Materials Research Society.
Original languageEnglish
Pages (from-to)3146-3153
JournalJournal of Materials Research
Volume24
DOIs
Publication statusPublished - 1 Oct 2009

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