Microstructure characterization of Al–Cr–Fe quasicrystals sintered using spark plasma sintering
- School of Mechanical & Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798 (Singapore)
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798 (Singapore)
- Erich Schmid Institute of Materials Science Austrian Academy of Sciences, A-8700 Leoben, Jahnstraße 12 (Austria)
In this study, Al–Cr–Fe powders were consolidated using spark plasma sintering at different temperatures (650 °C, 700 °C, 750 °C and 800 °C). The sintered samples were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and transmission electron microscopy (TEM). The porosity of the pellets is very sensitive to the sintering temperature: it reduces sharply from around 29.3% to around 3.1% when the sintering temperature increases from 650 °C to 700 °C probably due to the softening of quasicrystals at elevated temperatures. Metastable icosahedral Al–Cr–Fe transforms to stable decagonal Al–Cr–Fe in sintering process. Stable icosahedral Al–Cr–Fe forms in the samples sintered at 700 °C, 750 °C and 800 °C. Both stable quasicrystalline phases form through the nucleation and growth process in the sintering process. Selected area electron diffraction (SAED) analysis shows that the icosahedral phase and the decagonal phase formed in the sintering process have a quasilattice constant of about 0.45 nm and 1.2 nm, respectively. - Highlights: • Al–Cr–Fe quasicrystals were sintered using spark plasma sintering. • Metastable icosahedral Al–Cr–Fe transforms to decagonal Al–Cr–Fe during sintering. • Stable icosahedral Al–Cr–Fe forms during sintering at 700 °C to 800 °C. • Strain softening of quasicrystals at high temperature promotes SPS sintering.
- OSTI ID:
- 22587072
- Journal Information:
- Materials Characterization, Journal Name: Materials Characterization Vol. 110; ISSN 1044-5803; ISSN MACHEX
- Country of Publication:
- United States
- Language:
- English
Similar Records
Partial spectra of atomic thermal vibrations in decagonal and icosahedral quasicrystals