Title: Fracture characteristics and deformation behaviour of solution-treated Ti-15V-3Cr-3Sn-3Al alloy

Authors: Hideaki Moriya, Kotobu Nagai, Osamu Umezawa

Addresses: Department of Metallurgical Engineering, Faculty of Engineering, Chiba Institute of Technology, Narashino, Chiba 275-0016, Japan. ' National Research Institute for Metals, Tsukuba, Ibaraki 305-0047, Japan. ' National Research Institute for Metals, Tsukuba, Ibaraki 305-0047, Japan

Abstract: The present paper elucidates the fracture characteristics of solution-treated Ti-15V-3Cr-3Sn-3Al alloy having P single phase poly-crystalline. A Charpy impact test was done at temperatures between 77 K and 473 K. Tensile tests were performed at temperatures between 77 K and 355 K with various strain rates. A marked energy transition occurred at around room temperature. Equiaxed dimples with a size identical to P grain size covered the fracture surface of a sample, which showed higher absorbed energy. On the other hand, the lower shelf fracture was due to a flat fracture surface in which micro-dimples on the order of 1 pm partly covered. Localization of plastic deformation and not |cleavage fracture| was primarily responsible for the transition. Deformation localization was explained by the dependence of the plastic instability condition on strain rate and temperature. Plastic work for uniform deformation is considered to be sensitive to the strain rate and temperature.

Keywords: deformation; fracture; low-temperature behaviour; materials; impact tests; strain rates; plastic instability; titanium alloys.

DOI: 10.1504/IJMPT.1999.036269

International Journal of Materials and Product Technology, 1999 Vol.14 No.2/3/4, pp.229 - 243

Published online: 01 Nov 2010 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article