Improvement in Mechanical Performance of Biomaterial Ti Alloy by Controlling Volume Fraction of Martensite Phase

Toshikazu Akahori; Shota Ino; Tomokazu Hattori

doi:10.4028/www.scientific.net/MSF.1016.18

Paper Titles

Preface

Recent Developments in the Processing of Advanced Materials Using Severe Plastic Deformation
p.3

Achieving Superplasticity in Fine-Grained Al-Mg-Sc Alloys
p.11

Improvement in Mechanical Performance of Biomaterial Ti Alloy by Controlling Volume Fraction of Martensite Phase
p.18

Additive Manufacturing of Ti6Al4V with Wire Laser Metal Deposition Process
p.24

Model Description of the Unusual Temperature Dependence of the Viscosity of Metallic Glass-Forming Liquids
p.30

Mechanical Stress Issues of La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ
p.36

Effects of Al, Si and N Content on the Formation of M-A Constituent and HAZ Toughness of Ti-Containing Low-Carbon Steel
p.42

Grain Orientation Spread in Dynamically Recrystallized Austenitic Steel
p.50

HomeMaterials Science ForumMaterials Science Forum Vol. 1016Improvement in Mechanical Performance of...

Improvement in Mechanical Performance of Biomaterial Ti Alloy by Controlling Volume Fraction of Martensite Phase

Abstract:

Recently, biomaterial α + β type Ti alloys with relatively low Young’s modulus and high specific strength have been widely used all over the world. Martensite (M) phase in α + β type Ti alloy has been reported to improve the toughness and ductility, therefore, there is high possibility of improvement in the mechanical properties easily by controlling the volume fraction of M phase. In this study, the change in mechanical properties of α + β type Ti-6Al-7Nb (Ti67) with various volume fractions of M phase were systematically investigated through the various heat treatments and thermo-mechanical treatments. Microstructures of Ti67 subjected to ST at 1173 K to 1273 K below the temperature of β transus were composed of martensite and primary α phases. The volume fraction of M phase increased with an increase in ST temperature. Tensile strength increased simply with an increase in the volume fraction of M phase, while the elongation, reduction of area and Young’s modulus showed a reverse trend. Fatigue limit of Ti67 subjected to ST at 1243K showed the highest value of 880 MPa.

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Periodical:

Materials Science Forum (Volume 1016)

Pages:

18-23

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.1016.18

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Online since:

January 2021

Authors:

Toshikazu Akahori*, Shota Ino, Tomokazu Hattori

Keywords:

Fatigue Properties, Martensite Phase, Metallic Biomaterial, Microstructure, Tensile Properties, Titanium Alloys

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