An experimental survey was carried out on the magnetostrictive properties of duplex phase magnetic materials, which consisted of giant magnetostrictive (GMS)(Tb
xDy
1-x)Fe
y and mainly, zero magntostrictive alloy. In this case, duplex phase magnetic materials were produced by mechnical alloying (MA) method and subsequently, spark plasma sintering (SPS) in the state of no crack in the interface.
The results obtained were summarized as follows:
(1) As for giant magnetostrictor, (Tb
0.5Dy
0.5)Fe
1.8 alloy induces the larger magnetostriction (λ=Δl/1) of more than 2.2×10
-4 (at applied field-110kA/m)-employed as typical GMS composition hereafter.
(2) GMS/Fe-6.SSi materials show the deflective behavior in applied field under the influence of GMS's larger magnetostriction, though having a gradual change of ingredients in the interface.
(3) On the whole, the relationship between deflection (Δθ: longitudinal) and applied field (H: horizontal) is symmetrically Butterfly-type, excepting being anomalously in the initial magnetization to as-produced.
(4) In the first quadrant, the deflection (Δθ) of GMS/Fe-6.5Si materials increases linearly with the rise of applied field (H) together with less hysteresis, almost independently of Fe-6.5Si particle's morphologies.
(5) In this linear region, Δθ/ΔH is 1.1×10
-4rad/kAm
-1 for GMS/Fe-6.5Si, and further, may possibly be larger value for GMS combined with minus magnetostrictive (λ<0) one as Fe-14Si.
抄録全体を表示