PSI - Issue 23

Available online at www.sciencedirect.com Available online at www.sciencedirect.com

ScienceDirect ScienceDirect

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 Structural Integrity Procedia 00 (2019) 000 – 000

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 23 (2019) 233–238

© 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the ICMSMF organizers © 201 9 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. The manuscript s devoted to the inve tigatio of microstructure, static a d f t gue tensile properties of co mercially pure itanium grade 2 in two states with coarse grains (CG ≈ 25 µm) and ultra -fine grains (UFG ≈ 0.2 µm) . During mechan al tests, the in situ monit ing was conducted by means of acoustic emission a d digital image correlation. Scann g electron microscopy was mpl ye for fractur surface o servations. The results of the tensil ests show significant growth in ultimate strength nd decrease of uctili y due o grain-boundary strengthening. Fatigue tests r vealed that the high amount of defects (grain bounda ies, dislocations, e c.) in UFG suppr ss pl stic deformatio and eads to earlier crack initiation, howev r, at the macrocrack growth stage, these impurities are obstacles for th tr granular mechanism of f cture. Th experimental data obtained allow one to get the appropr ate nders anding of he mech nisms responsible for the variation of mecha ical properties and fracture patterns as well as to attain quantitative estimation of strain localization induced by the grain refinement. © 201 9 The Authors. Published by Elsevier B.V. This is an ope acces article under CC BY-NC-ND lic nse (http://creativecommon org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. 9th International Conference on Materials Structure and Micromechanics of Fracture Mechanical behavior of course-grain and ultrafine-grain titanium for biomedical application A. Eremin a, *, S. Panin a,b , A. Byakov a , Yu. Sharkeev a,b a Institute of Strength Physics and Materials Science SB RAS, 2/4 Akademichesky Avenue, Tomsk 634055, Russia b Tomsk Polytechnique University, 30 Lenina Avenue, Toms 634050, Russia The manuscript is devoted to the investigation of microstructure, static and fatigue tensile properties of commercially pure titanium grade 2 in two states with coarse grains (CG ≈ 25 µm) and ultra -fine grains (UFG ≈ 0.2 µm) . During mechanical tests, the in situ monitoring was conducted by means of acoustic emission and digital image correlation. Scanning electron microscopy was employed for fracture surface observations. The results of the tensile tests show significant growth in ultimate strength and decrease of ductility due to grain-boundary strengthening. Fatigue tests revealed that the high amount of defects (grain boundaries, dislocations, etc.) in UFG suppress plastic deformation and leads to earlier crack initiation, however, at the macrocrack growth stage, these impurities are obstacles for the transgranular mechanism of fracture. The experimental data obtained allow one to get the appropriate understanding of the mechanisms responsible for the variation of mechanical properties and fracture patterns as well as to attain quantitative estimation of strain localization induced by the grain refinement. 9th International Conference on Materials Structure and Micromechanics of Fracture Mechanical behavior of course-grain and ultrafine-grain titanium for biomedical application A. Eremin a, *, S. Panin a,b , A. Byakov a , Yu. Sharkeev a,b a Institute of Strength Physics and Materials Science SB RAS, 2/4 Akad michesky Avenue, Tomsk 634055, Russia b Tomsk Polytechnique University, 30 Lenina Avenue, Toms 634050, Russia Abstract Abstract

Keywords: titanium; ultrafine-grain; tensile test; fatigue; cyclic test; deformation; fracture; crack growth Keywords: titanium; ultrafine-grain; tensile test; fatigue; cyclic test; deformation; fracture; crack growth

1. Introduction 1. Introduction

Pure titanium grade 1-4 due to high biocompatibility, cost and relatively good processability have found wide applications in medicine for different implants and surgical hardware. It is known that implants during operation are subjected to various loads jointly with the hazardous environment; moreover, the implants should be installed only Pure titaniu grade 1-4 ue to high biocompatibility, cost and relatively good processability have found wid appli ations in medicine for different implants nd surgical hardware. It is known that implants during operation are subjected to various loads jointly with the hazardous environment; moreover, the implants should be installed only

* Corresponding author. E-mail address: ave@ispms.tsc.ru * Corresponding author. E-mail address: ave@ispms.tsc.ru

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an ope acces article under CC BY-NC-ND lic nse (http://creativecommon org/licenses/by-nc-nd/4.0/)

Peer-review under responsibility of the scientific committee of the IC MSMF organizers.

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the ICMSMF organizers 10.1016/j.prostr.2020.01.092