The constitution of the ternary system Al-Fe-Si is reinvestigated over the entire composition range by X-ray diffraction (XRD), differential thermal analysis (DTA), and scanning electron microscopy/energy dispersive X-ray (SEM/EDX). The liquidus projection obtained shows equilibria among nine ternary phases. Except for the occurrence of the three additional ternary phases not recognized at the time, the previous work is found to be accurate in most details. In the isothermal section at 550°C, an additional ternary phase occurs for which the indexed X-ray powder diffraction pattern is presented. Crystal structures reported for the other phases are all confirmed.
The constitution of the ternary system Al-Mn-Si over the entire composition range is investigated using metallography, X-ray diffraction (XRD), and differential thermal analysis (DTA). Ten stable ternary phase are identified and characterized. Isothermal sections for 550 ЊC and 700 ЊC, the liquidus projection, and a reaction scheme linking them are presented.
The constitution of the ternary system Al-Cr-Ti is investigated over the entire composition range using X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), differential thermal analysis (DTA) up to 1500°C, and metallography. Solid-state phase equilibria at 900°C are determined for alloys containing £75 at. pct aluminum and at 600°C for alloys containing >75 at. pct Al. A reaction scheme linking these solid-state equilibria with the liquidus surface is presented. The liquidus surface for £50 at. pct aluminum is dominated by the primary crystallization field of bcc b(Ti,Cr,Al). In the region >50 at. pct Al, the ternary L1 2 -type phase s forms in a peritectic reaction p max at 1393°C from L + TiAl. Furthermore, with the addition of chromium, the binary peritectic L + a(Ti,Al) = TiAl changes into an eutectic L = a(Ti,Al) + TiAl. This eutectic trough descends monotonously through a series of transition reactions and ternary peritectics to end in the binary eutectic L = Cr 7 Al 45 + (Al).
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