Effects of annealing on microstructure, composition and magnetic properties of rolled Fe/Ga-Al composite strip

摘要

The Ga liquid and Al powder were mechanically mixed and poured into a hollow iron plate, after alloying, the composite plate was rolled at room temperature for preparing an Fe/Ga-Al composite strip. The effect of annealing conditions on the diffusion, microstructures and magnetostrictive properties of the strip were studied. The composite plate had good cold rolling formability. After annealing at 750-850 degrees C for 5 h of the cold-rolled sample with a reduction of 97%, the diffusion distance of Ga and Al in the Fe matrix increased with an increase of the annealing temperature. However, some holes appeared in the center of the sample annealed at a temperature of more than 830 degrees C, which was detrimental to the subsequent rolling. The combination of the secondary cold rolling and annealing was beneficial to improve the composition homogeneity and magnetic properties of the sample. The magnetostriction coefficient (lambda(//)) of the primary rolled sample was low, similar to 4 x 10(-6). After annealing and secondary cold rolling, the lambda(//) of the sample increased to 9 x 10(-6) and the lambda(//) of the sample conducted by further annealing at 820 degrees C for 20 h reached 27.5 x 10(-6). (C) 2017 Elsevier B.V. All rights reserved.