Investigations of fracture mechanisms into Ti3Sn-based alloys

O.Ivanova,
     

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Krzhizhanovsky str., 3, Kyiv, 03142, Ukraine
Electron Microscopy and Strength of Materials - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2013, #19
http://www.materials.kiev.ua/article/772

Abstract

Fracture of a single-phase Ti3Sn alloy with a composition of Ti74,5Zr1Sn24,5 and eutectic Ti3Sn + Ti5Si3 material with a composition of Ti69Sn21Si10 has been investigated using three-point bending testing of notched samples with in situ microstructure observation of deformed material. Fractography studying has been performed. The Experimental results have shown that crack’s nucleation and propagation occure by bridging mechanism caused twins movement. Application of stress causes the self-accomodation of twins inside each grain accordingly to its crystall orientation. Microcraks nucleate on the grain boundaries that are the obstacles for the movement of twins. During the crack’s propagation a plastic deformation sone in front of the crack forms by twin’s reorientation process. Such mechanism leads to the big dissipation of energy during the propagation of cracks. Full text download


D019 SUPERSTRUCTURE, DESTRUCTION, INTERMETALLID TITAN, MARTENSITIC TRANSFORMATION, MECHANICAL PROPERTIES