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The near-α Ti–6Al–4Zr–4Nb (mass%) alloy is a recently developed alloy with potential for aerospace applications. This study evaluates the microstructure and mechanical properties of Ti–6Al–4Zr–4Nb produced by spark plasma sintering (SPS). The SPS samples sintered in the α+β regions exhibited equiaxed α with a neighboring thin β phase. Above the β-transus temperature, the α/β lamellar structure formed, allowing control of the grain size (100~200 μm). The compressive strength and the creep property of the SPS samples were compared with the LBPDed and the forged samples. The compressive strength of the SPS sample was lower than that of the LPBFed sample but similar to the forged sample. The SPS samples exhibited longer creep rupture life (2220 hours) than LPBFed samples (1730 hours), but shorter than the forged sample (4109 hours). The creep deformation mechanism of the lamellar structure in the SPS sample was dislocation creep.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: titanium alloy, high temperature , proof stress, creep rupture life, sintering, powder

Date published: 2024-05-11

Publisher: Springer Science and Business Media LLC

Journal:

• Metallurgical and Materials Transactions A (ISSN: 10735623) vol. 55 issue. 7 p. 2544-2554

Funding:

• The University of Tokyo

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1007/s11661-024-07422-8

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Updated at: 2024-07-17 08:30:14 +0900

Published on MDR: 2024-07-17 08:30:15 +0900