TY - JOUR

T1 - Influence of testing orientation on mechanical properties of Ti45Nb deformed by high pressure torsion

AU - Völker, Bernhard

AU - Jäger, Nikolaus

AU - Calin, Mariana

AU - Zehetbauer, Michael J.

AU - Eckert, Jürgen

AU - Hohenwarter, Anton

PY - 2017/1/15

Y1 - 2017/1/15

N2 - Ti45Nb is a promising choice as an implant material due to its low Young's modulus and its good biocompatibility, however the material's strength is relatively low in the conventionally coarse-grained state. Recently, severe plastic deformation was suggested to improve the mechanical properties of such materials. In this study the influence of the testing direction on the mechanical properties including strength, ductility and fracture toughness is investigated using relatively large HPT samples with a diameter of ~ 30 mm and a thickness of ~ 7 mm. It is shown that especially the strength and fracture toughness develop a pronounced orientation dependence. With respect to the testing direction, the strength increased from ~ 400 MPa in the coarse-grained state to around 950 to 1050 MPa after deformation and the fracture toughness remains quite high with values between 75 and 110 MPa m1/2. Hence, the deformed Ti45Nb alloy represents an alternative to other Ti-alloys recently used as implant materials with the major advantage of having a low Young's modulus combined with high strength and fracture toughness.

AB - Ti45Nb is a promising choice as an implant material due to its low Young's modulus and its good biocompatibility, however the material's strength is relatively low in the conventionally coarse-grained state. Recently, severe plastic deformation was suggested to improve the mechanical properties of such materials. In this study the influence of the testing direction on the mechanical properties including strength, ductility and fracture toughness is investigated using relatively large HPT samples with a diameter of ~ 30 mm and a thickness of ~ 7 mm. It is shown that especially the strength and fracture toughness develop a pronounced orientation dependence. With respect to the testing direction, the strength increased from ~ 400 MPa in the coarse-grained state to around 950 to 1050 MPa after deformation and the fracture toughness remains quite high with values between 75 and 110 MPa m1/2. Hence, the deformed Ti45Nb alloy represents an alternative to other Ti-alloys recently used as implant materials with the major advantage of having a low Young's modulus combined with high strength and fracture toughness.

KW - Beta-titanium alloys

KW - Fracture toughness

KW - High pressure torsion

KW - Implants

KW - Severe plastic deformation

KW - Young's modulus

UR - http://www.scopus.com/inward/record.url?scp=85006013243&partnerID=8YFLogxK

U2 - 10.1016/j.matdes.2016.10.035

DO - 10.1016/j.matdes.2016.10.035

M3 - Article

AN - SCOPUS:85006013243

VL - 114.2017

SP - 40

EP - 46

JO - Materials & design

JF - Materials & design

SN - 0264-1275

IS - 15 January

ER -