Anisotropic rare earth-Fe-B system and rare earth-Fe-Co-B system magnet

A rare earth--Fe--B anisotropic magnet having as main components thereof R and Fe and B, wherein R is at least one rare earth element including Y and said anisotropic magnet comprises a hot press molded body or HIP molded body having a composition comprising

• R:
• 10-20 atomic %, B:
• 3-20 atomic %,
• total amount of one or a plurality of Ga, Zr, and Hf:
• 0.001-5.0 atomic %, and
• total amount of one or a plurality of Al, V, and Si:
• 0.01-2.0 atomic %,
• the remainder comprising Fe and unavoidable impurities;
• the hot press molded body or HIP molded body has an aggregate structure of crystallized grains having as a main phase thereof R.sub.2 Fe.sub.14 B intermetallic compound having a tetragonal structure, the crystallized grains having dimensions of 0.05-20 .mu.m;
• and
• individual crystallized grains are present in an amount of more than 50 volume % of total crystallized grains comprising the aggregate structure which have a value of less than 2 of a ratio b/a of a smallest grain diameter a and a largest grain diameter b.

A rare earth element--Fe--B anisotropic magnet having as main components thereof R and Fe and B, wherein R is at least one rare earth element including Y and said anisotropic magnet comprises a hot press molded body or HIP molded body having a composition comprising

• R:
• 10-20 atomic %, B:
• 3-20 atomic %,
• total amount of one or a plurality of Ti, V, Nb, Ta, Al, and Si:
• 0.001-5.0 atomic %, and
• the remainder comprising Fe and unavoidable impurities;
• the hot press molded body or HIP molded body has an aggregate structure of crystallized grains having as a main phase thereof R.sub.2 Fe.sub.14 B intermetallic compound having a tetragonal structure, the crystallized grains having dimensions of 0.05-20 .mu.m;
• and
• individual crystallized grains are present in an amount of more than 50 volume % of the total crystallized grains comprising the aggregate structure which have a value of less than 2 of a ratio b/a of a smallest grain diameter a and a largest grain diameter b.

A rare earth--Fe--Co--B anisotropic magnet having as main components thereof R and Fe and Co and B, wherein R is at least one rare earth element including Y and said anisotropic magnet comprises a hot press molded body or HIP molded body having a composition comprising

• R:
• 10-20 atomic %, Co:
• 0.1-50 atomic %,
• B:
• 3-20 atomic %,
• total amount of one or a plurality of Ga, Zr, and Hf:
• 0.001-5.0 atomic %, and
• the remainder comprising Fe and unavoidable impurities;
• the hot press molded body or HIP molded body has an aggregate structure of crystallized grains having as a main phase thereof R.sub.2 (Fe, Co).sub.14 B intermetallic compound having a tetragonal structure, the crystallized grains having dimensions of 0.05-20 .mu.m;
• and
• individual crystallized grains are present in an amount of more than 50 volume % of the total crystallized grains comprising the aggregate structure which have a value of less than 2 of a ratio b/a of a smallest grain diameter a and a largest grain diameter b.

A rare earth--Fe--Co--B anisotropic magnet having as main components thereof R and Fe and Co and B, wherein R is at least one rare earth element including Y and said anisotropic magnet comprises a hot press molded body or HIP molded body having a composition comprising

• R:
• 10-20 atomic %, Co:
• 0.1-50 atomic %,
• B:
• 3-20 atomic %,
• total amount of one or a plurality of Ga, Zr, and Hf:
• 0.001-5.0 atomic %, and
• total amount of one or a plurality of Al, V, and Si:
• 0.01-2.0 atomic %,
• the remainder comprising Fe and unavoidable impurities;
• the hot press molded body or HIP molded body has an aggregate structure of crystallized grains having as a main phase thereof R.sub.2 (Fe, Co).sub.14 B intermetallic compound having a tetragonal structure, the crystallized grains having dimensions of 0.05-20 .mu.m;
• and
• individual crystallized grains are present in an amount of more than 50 volume % of the total crystallized grains comprising the aggregate structure which have a value of less than 2 of a ratio b/a of a smallest grain diameter a and a largest grain diameter b.

A rare earth--Fe--Co--B anisotropic magnet having as main components thereof R and Fe and Co and B, wherein R is at least one rare earth element including Y and said anisotropic magnet comprises a hot press molded body or HIP molded body having a composition comprising

• R:
• 10-20 atomic %, Co:
• 0.1-50 atomic %,
• B:
• 3-20 atomic %, and
• total amount of one or a plurality of Ti, V, Nb, Ta, Al, and Si:
• 0.001-5.0 atomic %,
• the remainder comprising Fe and unavoidable impurities;
• the hot press molded body or HIP molded body has an aggregate structure of crystallized grains having as a main phase thereof R.sub.2 (Fe, Co).sub.14 B intermetallic compound having a tetragonal structure, the crystallized grains having dimensions of 0.05-20 .mu.m;
• and
• individual crystallized grains are present in an amount of more than 50 volume % of the total crystallized grains comprising the aggregate structure which have a value of less than 2 of a ratio b/a of a smallest grain diameter a and a larger grain diameter b.