THE PREFERRED ORIENTATION, MICROSTRUCTURE AND MAGNETOSTOSTRION IN DIRECTIONALLX SOLIDIFIED TbDyFe ALLOYS
JIANG Chengbao (Department of Materials Science and Engineering; Beijing University of Aeronautics and Astronautics; Beijing 100083)ZHOU Shonseng;ZHANG Maocai;WANG Run (State Key Laboratory for Advanced Metal Materials; University of Science and Technology Beijing; Beijing 100083)
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JIANG Chengbao (Department of Materials Science and Engineering; Beijing University of Aeronautics and Astronautics; Beijing 100083)ZHOU Shonseng;ZHANG Maocai;WANG Run (State Key Laboratory for Advanced Metal Materials; University of Science and Technology Beijing; Beijing 100083). THE PREFERRED ORIENTATION, MICROSTRUCTURE AND MAGNETOSTOSTRION IN DIRECTIONALLX SOLIDIFIED TbDyFe ALLOYS. Acta Metall Sin, 1998, 34(2): 164-170.
Abstract The device of zone melting directional solidification has been used to investigate the preferred orientation, microstructure and magnetostriction of Tb0.3Dy0.7(Fe, M)1.95 (M=Al,Mn, B) metallic compound. When the temperature gradient GL≈700 K/cm, the growth velocity V mm/min, the crystal grows in plannar interface, 1< V 6 mm/min, in cellular morphology; V=8 - 12 mm/min, in primary dendrite; V > 15 mm/min, in developed delldrite. As V=12 mm/min, GL≈1000 and 400 K/cm, the crystal grows in cellular morphology developed dendrite, respectively. Crystals in cellular morphology are <110> preferred orientation and poor magnetostrictive property. Crystals in primary dendrite with <112> preferred orientation, have a good performance, the maximum value of magnetostriction (A) is 0.00175. Crystals in developed dendrite with part <112> orientation have an inferior property than the former.
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