Mechanical behavior of homogeneous and nearly homogeneous Ti3Sn: Role of composition and microstructure

Publication date: 5 July 2017
Source:Materials & Design, Volume 125
Author(s): Oleksandr Vdovychenko, Olga Ivanova, Yuriy Podrezov, Maryna Bulanova, Iuliia Fartushna
The impact of composition and grain size on mechanical behavior of as-cast Ti3Sn and near Ti3Sn alloys is investigated at room temperature in uni-axial compression and three-point bending tests. The concentration dependencies of both yield strength and bending failure strain show extreme behavior in the room temperature homogeneity range with minimum (about 90MPa) and maximum (15%), respectively, for the Ti75.6Sn24.4 composition. The failure strain in adjacent two-phase regions does not depend on Ti/Sn ratio and is about 2–3%. The yield strength of all the alloys is shown to increase according to the Hall-Petch type relation. A defect structure evolution during the process of deformation, studied with optical and electron microscopy, is indicative of the activation of a twinning deformation mechanism in a matrix phase. Inter-grain and inter-phase boundaries impede this deformation and affect nucleation and propagation of cracks.

Graphical abstract

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