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 Al96.6Fe1.5Cr1.7Ti0.2 and Al91.6Fe4.9Cr2.2Ti1.3 (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 Al13Fe4, Al13Cr2 and Al3Ti in the Al91.6Fe4.9Cr2.2Ti1.3 alloy, resulted in a hardness 1.6 times higher compared to the Al96.6Fe1.5Cr1.7Ti0.2 alloy.

中文翻译：

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快速凝固 Al-Fe-Cr-Ti 合金的显微组织、相形成和性能

当开发非平衡微观结构时，已经证明了 Al-Fe-Cr-Ti 合金机械强度的改进。本文研究了冷却速率和成分对新型 Al96.6Fe1.5Cr1.7Ti0.2 和 Al91.6Fe4.9Cr2.2Ti1.3 (at.-%) 合金的相形成、组织和性能的影响。用吸铸法生产的楔形样品通过光学、扫描电子显微镜、差示扫描量热法、X射线衍射、能量色散X射线光谱和显微硬度表征。结果表明，随着冷却速度的降低，花状相之前的相的形态和尺寸从小的球形颗粒变为大的花状相。Al91.6Fe4.9Cr2.2Ti1.3合金中存在金属间相Al13Fe4、Al13Cr2和Al3Ti，