SINTERED R-T-B BASED PERMANENT MAGNET AND A METHOD OF MAKING THE SINTERED R-T-B BASED PERMANENT MAGN

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A sintered R-T-B based permanent magnet includes a body having an easy-axis of magnetization. The body has a plurality of R2T14B main phases spaced from one another and a plurality of grain boundary phases between the R2T14B main phases. The body including zero heavy rare earth elements and the grain boundary phases includes a first and a second grain boundary phase. The first grain boundary phase is disposed between the R2T14B main phases and extends along and parallel to the easy-axis of magnetization whereby the first grain boundary phase forms a plurality of first grain boundary triple point areas with the first grain boundary triple point areas being a rare earth element rich phase having a high content of Al and Ga and includes 65 at. %≤Pr+Nd≤88 at. %, 10 at. %≤Al+Ga≤25 at. %, O≤10 at. %, and Fe+Cu+Co≤2 at. %. A method of making the sintered R-T-B based permanent magnet is disclosed herein.