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Microstructure evolution and microhardness analysis of metastable beta titanium alloy Ti-15V-3Cr-3Al-3Sn consolidated using equal-channel angular pressing from machining chips

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journal contribution
posted on 25.02.2021, 11:21 authored by Q Shi, Yau TseYau Tse, Rebecca HigginsonRebecca Higginson
Machining chips of Ti-15V-3Cr-3Al-3Sn metastable beta titanium alloy were consolidated using back pressure-assisted equal-channel angular pressing (BP-ECAP) using different processing conditions. Near fully dense specimens were obtained after multiple passes done at 500 °C with the aid of different back pressures. SEM and TEM observations show that ECAP resulted in a homogeneous formation of ultrafine equiaxed α grains (~ 180 nm) in the β matrix, due to the generation of an extensive amount of dislocations, vacancies and sub-grain boundaries during ECAP. Most of these α grains showed a random orientation with the β matrix. In addition, the observed grain refinement, increase in dislocation density and age hardening caused by this process resulted in a significant microhardness enhancement in the obtained parts. The microhardness homogeneity was improved as the processing temperature and the number of ECAP passes were increased.

Funding

Nature Science Foundation of Guangdong (Grant No. 2018A030313127)

Guangdong Academy of Sciences Project and Development (Grant No. 2018GDASCX-0961)

Guangzhou Science and Technology Project (201906040007)

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Materials

Published in

Journal of Materials Engineering and Performance

Volume

29

Issue

6

Pages

4142 - 4153

Publisher

Springer

Version

AM (Accepted Manuscript)

Rights holder

© ASM International

Publisher statement

This is a post-peer-review, pre-copyedit version of an article published in Journal of Materials Engineering and Performance. The final authenticated version is available online at: https://doi.org/10.1007/s11665-020-04913-8.

Publication date

2020-06-22

ISSN

1059-9495

eISSN

1544-1024

Language

en

Depositor

Dr Yau Yau Tse. Deposit date: 24 February 2021