Hot workability of R-Fe-B alloys and their magnetic properties

Authors:
Publisher website
Google Scholar
Abstract
The hot workability of R‐Fe‐B alloys and their magnetic properties were extensively investigated. Modified hot pressing employing a ring which constrains an alloy ingot enabled hot working without cracking at high strain rates up to ε̇ = 1 × 10−1/s. Excessive discharging of the liquid R‐rich phase was controlled and the refinement of crystal grains occurred at high strain rate hot pressing. Through these effects the maximum Hci reached 18 kOe, and a (BH)max of 33.3 MGOe with a moderate Hci of 15 kOe was obtained in a composition of the Pr‐Fe‐B‐Cu system. Post‐heat treatment at 475–525 °C was effective for enhancing Hci. It was found that even in Nd‐based alloys, a (BH)max of more than 30 MGOe was achieved by hot pressing at a high strain rate, because the change in composition during pressing is minimized.

This publication has 2 references indexed in Scilit: