The melting diagram of the Ti–Dy–Sn system below 40 at.% Sn

• Published in: International journal of materials research Vol. 101; no. 10; pp. 1298 - 1310
• Main Authors: Fartushna, Y., Meleshevich, K., Samelyuk, A., Bulanova, M.
• Format: Journal Article
• Language: English
• Published: Munich De Gruyter 01-10-2010; Hanser
• Subjects: Applied sciences; Concentration (composition); Electron probes; Exact sciences and technology; Invariants; Liquidus; Liquidus surface; Melting; Metals. Metallurgy; Phase diagrams; Solidus; Solidus surface; Tin; Titanium; Liquidus surface; Phase diagrams; Melting; Solidus surface; Phase diagram
• ISSN: 1862-5282; 2195-8556
• DOI: 10.3139/146.110408

Phase equilibria in the Ti–Dy–Sn system below 40 at.% Sn were studied using differential thermal analysis, X-ray diffraction, metallography and electron microprobe. The partial liquidus and solidus projections and the melting diagram (liquidus + solidus) were constructed. A new ternary compound τ with composition Ti
Dy
Sn
, found by us previously, melts congruently above 1 543 °C and coexists with all the phases based on the binary compounds of the boundary binaries in the concentration interval studied.
The liquidus surface is characterized by primary crystallization regions of (βTi), (βDy), (αDy), (Ti
Sn), (Ti
Sn), (Ti
Sn
), (Dy
Sn
) and τ. Five three-phase fields in the solidus surface result from three eutectic and two transition type invariant four-phase equilibria: L
⇄ (βTi) + (Ti
Sn) + (Dy
Sn
), L
⇄ (Ti
Sn) + τ + (Dy
Sn
), L
⇄ (βTi) + (αDy) + (Dy
Sn
), L
+ (Ti
Sn) ⇄ (Ti
Sn) + τ and L
+ (Ti
Sn) ⇄ (Ti
Sn
) + τ at 1 524, 1 500, 1 150, 1 543 and 1 498 °C, respectively.
In the two-phase areas (βTi) + (Dy
Sn
), (Ti
Sn) + (Dy
Sn
), (Ti
Sn) + τ and τ + (Dy
Sn
) the solidus surface has the temperature maxima at 1 620, 1 540, > 1 543 and > 1 500 °C, respectively.