Phase equilibria in the Al-Si-V system

作者：Huber Beatrix; Effenberger Herta S; Richter Klaus W^*

来源：Intermetallics, 2010, 18(4): 606-615.

DOI：10.1016/j.intermet.2009.10.016

• Aluminides, miscellaneous
• Phase diagrams
• Phase transformations
• Crystallography

The ternary Al-Si-V phase diagram between 0 and 50 at% V was investigated by a combination of optical microscopy, powder X-ray diffraction (XRD), differential thermal analysis (DTA) and electron probe microanalysis (EPMA). Ternary phase equilibria were investigated within three isothermal sections at 500 degrees C and 620 degrees C for alloys up to 20 at% V and at 850 degrees C for alloys with more than 20 at% V. A new ternary phase, tau, with the approximate composition Al0.6Si1.4V was discovered and the structure was determined by means of single crystal XRD. DTA was used to identify a total number of nine invariant ternary reactions yielding a ternary reaction scheme (Scheil diagram) in the investigated composition range. A partial liquidus surface projection was constructed by combining our own DTA data with literature data for the limiting binary systems. In the binary Si-V system, the composition limits of the phase Si3V5 were reinvestigated and we found that this phase exhibits a noticeable homogeneity range in contradiction to previous literature reports.

• 出版日期2010-4