Microstructure, phase formation and properties of rapid solidified Al–Fe–Cr–Ti alloys. Issue 11 (23rd July 2020)

• Record Type: Journal Article
• Authors: de Araujo, Aylanna P. M.; Micheloti, Leandro; Kiminami, Claudio S.; Gargarella, Piter
• Is Part Of: Materials science and technology. Volume 36:Issue 11(2020)
• Page Start: 1205
• Page End: 1214
• Publication Date: 2020-07-23
• Subjects: Rapid solidification -- Al-based alloys -- characterisation; Materials science -- Periodicals; Microstructure -- Periodicals; Metallurgy -- Periodicals; 620.1105
• DOI: 10.1080/02670836.2020.1763555
• Languages: English
• ISSNs: 0267-0836

Abstract

Abstract : Improvements in the mechanical strength of Al–Fe–Cr–Ti alloys have been demonstrated when non-equilibrium microstructures are developed. This paper investigated the effect of cooling rate and composition on the phase formation, microstructure and properties of new Al96.6 Fe1.5 Cr1.7 Ti0.2 and Al91.6 Fe4.9 Cr2.2 Ti1.3 (at.-%) alloys. Wedge-shaped samples produced by suction casting were characterised by optical, scanning electron microscopy, differential scanning calorimetry, X-ray diffraction, energy dispersive X-ray spectroscopy and microhardness. The results showed that the morphology and size of the phases precedent of the flower-like phases change from small, spherical particles to large flower-like phases with decreasing the cooling rate. The presence of intermetallic phases Al13 Fe4, Al13 Cr2 and Al3 Ti in the Al91.6 Fe4.9 Cr2.2 Ti1.3 alloy, resulted in a hardness 1.6 times higher compared to the Al96.6 Fe1.5 Cr1.7 Ti0.2 alloy.