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Spray forming of bulk ultrafine-grained Al-Fe-Cr-Ti

journal contribution
posted on 28.07.2014, 12:53 by C. Banjongprasert, Simon HoggSimon Hogg, Enzo Liotti, Caroline Kirk, S.P. Thompson, J. Mi, P.S. Grant
An Al-2.7Fe-1.9Cr-1.8Ti alloy has been spray formed in bulk and the microstructure and properties compared with those of similar alloys produced by casting, powder aomization (PA), and mechanical alloying (MA) routes. In PA and MA routes, a nanoscale metastable icosahedral phase is usually formed and is known to confer high tensile strength. Unlike previous studies of the spray forming of similar Al-based metastable phase containing alloys that were restricted to small billets with high porosity, standard spray forming conditions were used here to produce a ~98 pct dense 19-kg billet that was hot isostatically pressed (‘‘HIPed’’), forged, and/or extruded. The microstructure has been investigated at all stages of processing using scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and synchrotron X-ray diffraction (XRD) at the Diamond Light Source. Consistent with the relatively low cooling rate in spray forming under standard conditions, the microstructure showed no compelling evidence for the formation of metastable icosahedral phases. Nonetheless, after downstream processing, the spray-formed mechanical properties as a function of temperature were very similar to both PA rapid solidification (RS) materials and those made by MA. These aspects have been rationalized in terms of the typical phases, defects, and residual strains produced in each process route.

Funding

The authors thank the UK Engineering and Physical Science Research Council (Grant No. EP/E040608/1) for financial support. CB thanks the Royal Thai Government for financial support.

History

School

  • Science

Department

  • Chemistry

Published in

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE

Volume

41A

Issue

12

Pages

3208 - 3215 (8)

Citation

BANJONGPRASERT, C. ... et al, 2010. Spray forming of bulk ultrafine-grained Al-Fe-Cr-Ti. Metallurgical and Materials Transactions A, 41(12), pp.3208-3215.

Publisher

Springer (© The Minerals, Metals & Materials Society and ASM International)

Version

NA (Not Applicable or Unknown)

Publication date

2010

Notes

This paper is closed access.

ISSN

1073-5623

Language

en

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