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Title: Prediction of particle orientation in simple upsetting process of NdFeB magnets

The magnetic properties of NdFeB magnets are strongly affected by crystallographic texture which is highly associated with particle orientation. This study proposed a method for predicting the particle orientation in the simple upsetting process of NdFeB magnets. The method is based on finite element simulation with flow net analysis. The magnets in a cylindrical form were compressed by two flat dies in a chamber filled with argon at 750°C. Three forming speeds were taken into account in order to obtain flow stress curves used in simulations. The micrographs of the cross sections of the deformed magnets show that the particle deformation significantly increases with the compression. The phenomenon was also predicted by the proposed method. Both simulated and experimental results show that the inhomogeneity of the texture of the NdFeB magnets can be increased by the simple upsetting process. The predicted particle orientations were in a good agreement with those examined in the deformed magnets. The proposed method for predicting particle orientations can also be used in other forming processes of NdFeB magnets.
Authors:
;  [1] ; ; ;  [2]
  1. Department of Mold and Die Engineering, National Kaohsiung University of Applied Sciences, 415 Chien-Kung Road, Sanmin District, Kaohsiung 80778, Taiwan (China)
  2. Metal Forming Technology Section, Metal Processing R and D Department, Metal Industries Research and Development Centre, 1001 Kaonan Highway, Kaohsiung 81160, Taiwan (China)
Publication Date:
OSTI Identifier:
22261658
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1567; Journal Issue: 1; Conference: NUMISHEET 2014: 9. international conference and workshop on numerical simulation of 3D sheet metal forming processes, Melbourne (Australia), 6-10 Jan 2014; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 97 MATHEMATICAL METHODS AND COMPUTING; COMPRESSION; CROSS SECTIONS; CRYSTALLOGRAPHY; FINITE ELEMENT METHOD; FLOW STRESS; MAGNETIC PROPERTIES; MAGNETS; ORIENTATION; PARTICLES; SIMULATION; TEXTURE