TY - JOUR

T1 - Fracture behavior of ultrafine-grained titanium under tension at elevated temperatures

AU - Sajadifar, S. V.

AU - Maier, H. J.

AU - Niendorf, T.

AU - Yapici, G. G.

N1 - Funding Information: The authors are thankful for the partial support from the Marie Curie Career Integration Grant (Grant No. 304150) within the EU-FP7 program for conducting this study. The authors are also grateful to the “Safer Materials” project funded by the Hessen State Ministry of Higher Education, Research and the Arts— Initiative for the Development of Scientific and Economic Excellence (LOEWE).

PY - 2020/10/1

Y1 - 2020/10/1

N2 - This investigation focused on the deformation response and microstructural changes of severely deformed titanium during post-severe plastic deformation tension, at temperatures of 300-600 °C and at strain rates of 0.001-0.1 s-1. The obtained results suggest that SPD enhances the strength of grade 4 titanium up to 500 °C. At above 600 °C, the severely deformed microstructure showed comprehensive recovery. Severely deformed titanium was seen to be highly sensitive to the deformation rate, where strain rate sensitivity increased with the increase of test temperature. Analysis of fracture surfaces reveals that at elevated temperatures, growth of dimples and void coalescence occurs due to the enhanced diffusion rate and occurrence of recrystallized grains.

AB - This investigation focused on the deformation response and microstructural changes of severely deformed titanium during post-severe plastic deformation tension, at temperatures of 300-600 °C and at strain rates of 0.001-0.1 s-1. The obtained results suggest that SPD enhances the strength of grade 4 titanium up to 500 °C. At above 600 °C, the severely deformed microstructure showed comprehensive recovery. Severely deformed titanium was seen to be highly sensitive to the deformation rate, where strain rate sensitivity increased with the increase of test temperature. Analysis of fracture surfaces reveals that at elevated temperatures, growth of dimples and void coalescence occurs due to the enhanced diffusion rate and occurrence of recrystallized grains.

KW - dynamic recrystallization

KW - ECAE/ECAP

KW - fracture

KW - fracture morphology

KW - materials processing

KW - mechanical behavior

KW - microstructure property relationships

KW - plastic behavior

KW - severe plastic deformation

KW - titanium

UR - http://www.scopus.com/inward/record.url?scp=85096914156&partnerID=8YFLogxK

U2 - 10.1115/1.4047747

DO - 10.1115/1.4047747

M3 - Article

AN - SCOPUS:85096914156

VL - 142

JO - Journal of Engineering Materials and Technology, Transactions of the ASME

JF - Journal of Engineering Materials and Technology, Transactions of the ASME

SN - 0094-4289

IS - 4

M1 - 041009

ER -