Solid State Science and Technology, Vol. 14, No 1(2006) 28-33

ISSN 0128-7389

28

 

MICROSTRUCTURE OF HEAT TREATED NdFeB-BASED ALLOYS

 

A.Shaaban, E.A.Othman, M.H.Salleh and P.Hussain

AMREC, SIRIM Berhad, Lot 34, Jalan Hi-Tech 2/3, Kulim Hi-Tech Park,

09000 Kulim, Kedah Darul Aman

 

ABSTRACT

Alloys of composition closed to the stoichiometric require a lengthy heat treatment to dissolve -Fe within the microstructure. Microstructural comparisons of alloys before and after heat treatment revealed increasing amount of the Nd2Fe14B phase but proportionally decreasing the secondary phase (Nd-rich and Nd1.1Fe4B4). Grain size of hard magnetic phase increased substantially with time and temperature of treatment. Such microstructural conditions are generally attributed to the lower rate of hydrogen reaction.

 

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