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    STUDIA PHYSICA - Issue no. 1 / 2014  
         
  Article:   STRUCTURAL AND MAGNETIC PROPERTIES OF THE Mn50Al46Ni4 ALLOY.

Authors:  M. COLDEA, V. POP. 		 
       
         
  Abstract:  In this work the structural and magnetic properties of the Mn50Al46Ni4 alloy were investigated. Differential Thermal Analysis (DTA) measurements pointed out the formation of the metastable τ phase around 480 ºC and its decomposition into the stable γ2 and β-Mn(Al) phases at 850 ºC. X-ray Diffraction (XRD) investigations show that all of the samples are phase mixtures. The τ phase was found along with the ε’ phase only in the as-cast sample and the ones annealed at 470°C, a fact which was confirmed by M(T) measurements which showed two transitions at 445 K and 628 K, which correspond to the ferromagnetic ε’ and τ phases, respectively. The samples annealed at 710 and 850 ºC showed a single magnetic phase behavior with lower Curie temperatures of 418 K (Al2Mn3) and 434 K (ε’-type phase) respectively. A maximum τ phase concentration of 43% was found for the sample annealed at 470 ºC for 5 h. The close values of the theoretical and experimental effective magnetic moments confirm the existence of the ε’ and τ phases in these alloys.

Keywords: Differential thermal analysis, Mn-Al alloys, annealing, crystal structure, magnetic properties 		 
         
     
         
         
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