A new beta titanium alloy system reinforced with superlattice intermetallic precipitates

SCRIPTA MATERIALIA

卷:140

Article

Knowles, Alexander J.^1,2  Jun, Tea-Sung^1,3  Bhowmik, Ayan¹  Jones, Nicholas G.²  Britton, T. Ben¹  Giuliani, Finn¹  Stone, Howard J.²  Dye, David¹ 

[1] Imperial Coll, Dept Mat, London SW7 2AZ, England

[2] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB3 0F3, England

[3] Incheon Natl Univ, Dept Mech Engn, 119 Acad Ro, Incheon 22012, South Korea

关键词: Titanium alloys;    Precipitation;    Microstructure;    Mechanical properties;    Dislocations;   

DOI  :  10.1016/j.scriptamat.2017.06.038

来源: Elsevier

【 摘 要 】

Titanium alloys traditionally lack a nm-scale intermetallic precipitate that can be exploited for age hardening from solid solution. Here such a strengthening concept is developed in the Ti-Fe-Mo system, with it being found that a high temperature beta (bcc A2) single-phase field for homogenisation can be obtained, which following ageing (750 degrees C/80 h) precipitated B2 TiFe < 100 nm in size. The orientation relationship was found to be (100)(A2)//(100)(B2), {100}(A2)//{100}(B2), with a misfit of -6.1%. The alloy was found to be very hard (HV0.5 = 6.4 GPa) and strong (sigma(y), (0.2) = 1.9 GPa) with a density of 6.68 g cm(-3). TEM observation and micropillar deformation showed that the precipitates resist dislocation cutting. Crown Copyright (C) 2017 Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free