The general properties of rare earth-manganese alloys are described and reviewed. The Pr-Mn system was studied using differential thermal analysis, X-ray examination, metallography and microprobe analysis. Both the stable phase diagram and information on the metastable equilibria were obtained. Evidence of the peritectic formation (790 °C) of Pr6Mn23 (Th6Mn23-type structure) and the decomposition (about 650 °C) of the same phase appears in the stable diagram. A eutectic (660 °C, 25 at.% Mn) was also observed. The peritectic formation (740 °C) of PrMn2 (hexagonal Laves phase) took place under metastable conditions. The various methods of preparing these alloys are discussed and their strong reactivity with alumina is studied. Finally it is shown that the Pr-Mn diagram fits well in the sequence of the known diagrams of manganese with the rare earths and the basic metals. The relation between the ratio of the atomic dimensions, the valence electron number and the mutual reactivity is emphasized. © 1985.

Alloying behaviour of manganese with basic metals: PrMn system

SACCONE, ADRIANA;DELFINO, STEFANO;FERRO, RICCARDO
1985

Abstract

The general properties of rare earth-manganese alloys are described and reviewed. The Pr-Mn system was studied using differential thermal analysis, X-ray examination, metallography and microprobe analysis. Both the stable phase diagram and information on the metastable equilibria were obtained. Evidence of the peritectic formation (790 °C) of Pr6Mn23 (Th6Mn23-type structure) and the decomposition (about 650 °C) of the same phase appears in the stable diagram. A eutectic (660 °C, 25 at.% Mn) was also observed. The peritectic formation (740 °C) of PrMn2 (hexagonal Laves phase) took place under metastable conditions. The various methods of preparing these alloys are discussed and their strong reactivity with alumina is studied. Finally it is shown that the Pr-Mn diagram fits well in the sequence of the known diagrams of manganese with the rare earths and the basic metals. The relation between the ratio of the atomic dimensions, the valence electron number and the mutual reactivity is emphasized. © 1985.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11567/843336
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