Deformation twinning in the full-α″ martensitic Ti–25Ta–20Nb shape memory alloy. (15th February 2016)

• Record Type: Journal Article
• Authors: Bertrand, Emmanuel; Castany, Philippe; Yang, Yang; Menou, Edern; Gloriant, Thierry
• Is Part Of: Acta materialia. Volume 105(2016)
• Page Start: 94
• Page End: 103
• Publication Date: 2016-02-15
• Subjects: EBSD -- Twinning -- α″ martensite -- Titanium -- Shape memory alloy; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2015.12.001
• Languages: English
• ISSNs: 1359-6454

Abstract

Abstract: Deformation twinning of the Ti–25Ta–20Nb (mass%) shape memory alloy is characterized using EBSD and TEM. The selfaccommodating α″ microstructure is shown to be first deformed using {111}α ″ type I and <211>α ″ type II reorientation twinning. Plastic deformation occurs further by plastic twinning with a new {130}<310>α ″ twinning system. Maximum lattice deformation calculation is a relevant parameter to predict the variant of martensite that is favored during the reorientation process. Conversely, Schmid factor analysis can be used to predict the selection of {130}<310>α ″ twinning variants during deformation. Analogy between {130}<310>α ″ and {332}<113>β twinning systems is highlighted. Graphical abstract: