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MICROSTRUCTURE AND PROPERTIES OF THE HEAT TREATED DS Tb--Dy--Fe ALLOY |
JIANG Chengbao; ZHAO Yan; XU Huibin |
School of Materials Science and Engineering; Beijing University of Aeronautics and Astronautics; Beijing 100083 |
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Cite this article:
JIANG Chengbao; ZHAO Yan; XU Huibin. MICROSTRUCTURE AND PROPERTIES OF THE HEAT TREATED DS Tb--Dy--Fe ALLOY. Acta Metall Sin, 2004, 40(4): 378-382 .
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Abstract <110> oriented rods of a Tb--Dy--Fe magnetostrictive alloy have been successfully prepared by zone melting unidirectional
solidification. A homogenization annealing for 4 or 48 h at 900---1100 C
has been carried out in a quartz cylinder under Ar protection after pumping to 2X10 -3 Pa. It was found that, after annealing,
<110> preferred orientation is unchanged, the net shape pseudo--eutectic rare earth phase trends discontinuous and spheroidal,
magnetostriction slightly decreased without pre--stress but increased obviously with pre--stress. An obvious magnetostriction jump effect was observed in the annealed samples. A satisfactory magnetostrictive
property of 1950X10 -6 was obtained under 15 MPa pre--stress after 4 h heat treatment. The compressive stresses of the heat--treated
samples decrease monotonously with increasing the soaking time. A satisfactory combination of the magnetostriction and mechanical
properties was obtained at annealing for 4 h for the <110> oriented Tb--Dy--Fe alloy.
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Received: 16 April 2003
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