The effect of ageing on microstructure and mechanical properties of powder Ti-5Al-5Mo-5V-1Cr-1Fe alloy

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:605

Article

Ahmed, Mansur¹  Savvakin, Dmytro G.²  Ivasishin, Orest M.²  Pereloma, Elena V.^1,3 

[1] Univ Wollongong, Sch Mech Mat & Mechatron Engn, Wollongong, NSW 2522, Australia

[2] Natl Acad Sci Ukraine, Inst Met Phys, UA-03142 Kiev, Ukraine

[3] Univ Wollongong, Electron Microscopy Ctr, Wollongong, NSW 2519, Australia

关键词: Powder Ti-55511;    Ageing;    Microstructure;    X-ray diffraction;    Mechanical properties;   

DOI  :  10.1016/j.msea.2014.03.030

来源: Elsevier

【 摘 要 】

The thermo-mechanically processed powder Ti-5Al-5V-5Mo-1Cr-1Fe alloy was aged at 923 K for 1-8 h in order to investigate the effect of ageing time on the microstructure-mechanical properties relationships. The microstructures of the alloy after ageing consist of the both primary and secondary a phases with retained beta matrix phase. The shift of beta peaks in X-ray pattern with ageing time indicates an increase in lattice parameter distortion due to diffusion into the retained beta phase of more beta stabilisers with smaller atomic radius compared to the elemental Ti. The tensile test results indicate that the sample aged for 1 h has achieved the best combination of mechanical properties with ultimate tensile strength of 1194 MPa and total elongation of 14.1% among all the experimented conditions. The modified Crussard-Jaoul method is applied to characterise the work hardening behaviour of the alloy. (C) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

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