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Spray forming of bulk ultrafine-grained Al-Fe-Cr-Ti
journal contribution
posted on 2014-07-28, 12:53 authored by C. Banjongprasert, Simon HoggSimon Hogg, Enzo Liotti, Caroline Kirk, S.P. Thompson, J. Mi, P.S. GrantAn 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 SCIENCEVolume
41AIssue
12Pages
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
2010Notes
This paper is closed access.ISSN
1073-5623Publisher version
Language
- en