Strain rate sensitivity and deformation activation volume of coarse-grained and ultrafine-grained TiNi alloys. (June 2015)

• Record Type: Journal Article
• Authors: Gunderov, D.V.; Maksutova, G.; Churakova, A.; Lukyanov, A.; Kreitcberg, A.; Raab, G.I.; Sabirov, I.; Prokoshkin, S.
• Is Part Of: Scripta materialia. Volume 102(2015)
• Page Start: 99
• Page End: 102
• Publication Date: 2015-06
• Subjects: TiNi alloys -- Severe plastic deformation -- Ultra-fine grained material -- Strain rate sensitivity -- Activation volume; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2015.02.023
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract : Two TiNi alloys, Ti49.4 Ni50.6 and Ti50 Ni50, are subjected to equal-channel angular pressing (ECAP) resulting in the formation of a homogeneous ultra-fine grained microstructure. Tensile tests and strain rate jump tests are carried out in the temperature range of 25–400 °C to measure mechanical properties and strain rate sensitivity of both alloys before and after ECAP processing. Effect of grain size on mechanical behavior, strain rate sensitivity and mechanisms operating during plastic deformation of both alloys in the given temperature range is discussed.