Stability of the icosahedral phase in Mn-Ti alloys

The crystallization of the icosahedral phase (i-phase) has been investigated in rapidly quenched MnTi sub 2 . Differential thermal analysis showed a broad endothermic peak between 1100-1350K. TEM studies showed that the i-phase transforms in this temperature range to at least two crystalline phases,...

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Veröffentlicht in:	Scripta metallurgica 1989-05, Vol.23 (5), p.691-695
Hauptverfasser:	Holzer, J.C., Kelton, K.F., Levine, L.E., Gibbons, P.C.
Format:	Artikel
Sprache:	eng
Schlagworte:	Cross-disciplinary physics: materials science rheology Exact sciences and technology Materials science Metals, semimetals and alloys Phase diagrams and microstructures developed by solidification and solid-solid phase transformations Physics Specific materials
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Zusammenfassung:	The crystallization of the icosahedral phase (i-phase) has been investigated in rapidly quenched MnTi sub 2 . Differential thermal analysis showed a broad endothermic peak between 1100-1350K. TEM studies showed that the i-phase transforms in this temperature range to at least two crystalline phases, one being unidentified and the other being a rhombohedral phase with a 1.77 nm edge length. Samples annealed at 1275K for 30 min in vacuum contained a bcc phase with a = 1.344 nm. None of these crystalline phases are present in the equilibrium phase diagram. It is suggested that the bcc phase is related to the Frank--Kasper phase Mg sub 32 (Al,Zn) sub 49 . Graphs, photomicrographs. 18 ref.--D.O.N.
ISSN:	0036-9748
DOI:	10.1016/0036-9748(89)90513-9