A comparative study of mechanical alloying and mechanical milling of Nd8Fe88B4

作者：Zeng Q^*; Xiao YF; Liu XB; Dong SZ; Deng YS; Zhang ZY; Wang R

来源：Journal of Materials Engineering and Performance, 1999, 8(3): 305-308.

DOI：10.1361/105994999770346846

• mechanical alloying
• mechanical milling
• nanocrystalline materials
• Nd-Fe-B alloys
• permanent magnets

A comparative study was made of structure and magnetic properties of Nd8Fe88B4 prepared by mechanical alloying (MA) using elemental powders as starting materials and by mechanical milling (MM) of the alloy. X-ray diffraction (XRD and differential scanning calorimetry (DSC) combined with transmission electron microscopic (TEM) studies revealed that both milling procedures resulted in a mixture of alpha-Fe and an amorphous phase. The thermal stability of the as-milled powders produced by MA was comparable to that of the as-milled powders produced by MM. Heat treatment of the milled powders above the crystallization temperature resulted in the formation of a nanocrystalline mixture of Nd2Fe14B and alpha-Fe, but annealed MA powders demonstrated a somewhat coarser structure in comparison with annealed MM powders. Therefore, higher remanences and coercivities were obtained by MM.

• 出版日期1999-6
• 单位北京科技大学