MAGNETIC PROPERTIES OF (PR,ND)-FE-B-CU MAGNETS PRODUCED BY UPSET FORGING OF CAST INGOT

MARCONDES, P.V.P; KLEIN, A.N.; FARIA, R. N.; HARRIS, P. BOWEN AND I. R.

doi:10.5151/2594-5327-49v3-07-16

Congresso Anual da ABM

ISSN 2594-5327

49º Congresso anual — Vol. 49, Num. 1 (1994)

Título

MAGNETIC PROPERTIES OF (PR,ND)-FE-B-CU MAGNETS PRODUCED BY UPSET FORGING OF CAST INGOT

DOI

10.5151/2594-5327-49v3-07-16

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Resumo

Anisotropic (RE:Dy,Nd)-Fe-B-Cu-type (RE:Dy,Nd) permanent magnets have been produced from cast ingot materials using upset forging. Magnets based on the composition Dy₂₀.3Fe₇₃.8B₆.7Cu₂ were produced with Br = 10 kG, Hc = 18.5 kOe and (BH)max = 22.5 MGOe at a forging temperature as low as 790 °C; and after a post-forging heat treatment at 1000 °C for 5 hours and then at 500 °C for 3 hours. Hot pressing temperatures from 650 to 810 °C and a constant strain rate (ε) of 2.0 × 10⁻¹ s⁻¹ and thickness reduction of 85% have been employed. Squeezing out of the RE-rich-phase during forging was avoided by enclosing the specimens in a copper ring. For comparison, an investigation on the magnetic properties of Nd₂₀Fe₇₃.8B₆.2Cu₂ upset forged magnets has also been carried out and a moderate energy product of 13.7 MGOe has been achieved for this alloy.

Palavras-chave

Permanent magnets, Upset forging, Rare-earth magnets, Anisotropy, Magnetic properties

Como citar

MARCONDES, P.V.P; KLEIN, A.N.; FARIA, R. N.; HARRIS, P. BOWEN AND I. R.. MAGNETIC PROPERTIES OF (PR,ND)-FE-B-CU MAGNETS PRODUCED BY UPSET FORGING OF CAST INGOT, p. 1069-1078. In: 49º Congresso anual, Rio de Janeiro, Brasil, 1994.
ISSN: 2594-5327, DOI 10.5151/2594-5327-49v3-07-16