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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.46  No.8 (2005)  >  pp.1933-1937

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Magnetostriction of Polycrystalline Strong-Textured Fe–17 at%Ga Laminates

Chihiro Saito1), Yasubumi Furuya1), Teiko Okazaki1) and Mamoru Omori2)
1) Faculty of Science and Technology, Hirosaki University
2) Institute for Materials Research, Tohoku University

Magnetostrictive bulk Fe–17 at%Ga alloy was fabricated by combining laminates of rapid-solidified ribbons (80 μm in thickness) using the spark plasma sintering/joining (SPSJ). The SPSJ is characterized by a short time, low temperature heating and sintering process. The laminated sample made by the SPSJ maintained a unique metallurgical microstructure of polycrystalline texture of columnar grains, as well as the almost non-equilibrium metastable phase with little evidence of the precipitates of the ordered phases as found in the as-spun ribbons. An excellent sintered sample exhibiting large magnetostriction was obtained under a condition of compressive stress of 100 MPa at a temperature of 973 K. The magnetostriction depended on compressive pre-stress level for each specimen and reached about 100 ppm, which was half the value obtained for the ribbon sample. Furthermore, by subjecting this specimen to a short annealing process, the magnetostriction increased to 170 ppm, comparable to the value for the ribbon.

iron–gallium alloy, magnetostriction, rapid-solidification method, spark plasma sintering, crystalline texture

Received: January 17, 2005
Accepted: June 15, 2005 , Published online: November 14, 2005
Copyright (c) 2005 The Japan Institute of Metals



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