Microstructure of explosively compacted Nd-Fe-B magnets

作者：Ao, Q^*; Liu, W; Wu, JS

来源：Materials Transactions, 2005, 46(1): 123-125.

DOI：10.2320/matertrans.46.123

• explosively compacted Nd-Fe-B
• microstructure
• boundary phase

The microstructure of explosively compacted Nd-Fe-B alloys has been investigated by means of transmission electron microscopy and Xray diffraction. It is shown that there are three kinds of phases, i.e. the matrix phase Nd2Fe14B, O-rich phases and Nd-rich phases in explosively compacted Nd-Fe-B magnets. The matrix Nd2Fe14B phase is tetragonal, with lattice parameters of a = 0.88 nm and c = 1.22 nm. The O-rich phase was present at the two-grain boundary and three-grain junctions, with the fee structure, and the lattice parameter is a = 0.559 nm. The O-rich phase belongs to the compound Nd-Fe-O, and the contents of O, Nd and Fe are 45-60 at%, 20-40 at% and 10-21 at%, respectively. It is also shown that a large number of block-shaped Nd-rich phases are in a two-grain boundary or three-grain junctions or Nd2Fe14B phase, with the hcp structure and the lattice parameters of a = 0.395 nm and c = 0.628 nm. The Nd-rich phases belong to compound Nd-O, and the contents of Nd and O are 80-85 at% and 10- 15 at%, respectively. Also a few dislocations in the boundary phase have been observed.

• 出版日期2005-1
• 单位上海交通大学