| Abstract: | 本實驗研究了淬火處理及稀土元素R(R=Tb、Dy、Ho)參雜效應對Fe87Ga13合金磁-機械耦合特性之影響。在淬火效應中，發現淬火能有效改善Fe87Ga13合金之磁-機械耦合特性(包含: KE、ξ、dλ/dH、ΔEs/E0、ΔGs/G0)。其中Fe87Ga13合金之阻尼能力在淬火後有高達74%之提高，並與理論計算中由磁區壁共振所貢獻之阻尼能力變化率(88%)高度吻合。此顯示Fe87Ga13合金經淬火阻尼能力之提高乃由磁區壁共振所導致之微觀渦電流機制所主導。經淬火處理之Fe87Ga13合金具有(200)織構，有別於爐冷合金之(110)織構，此影響其磁-機械耦合特性(包含:dλ/dH及ΔE/E0與ΔG/G0)及磁區結構，並導致Fe87Ga13合金之阻尼能力ξ以及磁機械耦合因子KE的提升。此外，在Dy參雜效應中，發現參雜0.2%Dy並淬火能使Fe87Ga13合金在磁場下之楊式係數E變化(ΔE/E0)大幅提升。在外加場H=2.5 kOe之測試條件下，ΔE/E0可由6.1 %提升至12.0 %，提升幅度接近100%。除此之外，Fe86.8Ga13Dy0.2合金之在H=0.25 kOe之低場下，E便有高達9%之提升。由XRD分析中發現，所有參雜比例之Fe87Ga13合金皆由A2、D03 以及D03變體等三相構成。其中以參雜0.2%Dy之Fe87Ga13合金具有最高之D03變體相分率，同時具有最高之dλ///dH=0.79 ppm/Oe及ΔE/E0=12%。這使得參雜0.2%Dy之Fe87Ga13合金具有高達22%之磁-機械耦合係數K。但過量Dy(x>2%)降低D03變體相比率並提高D03相分率，導致磁致伸縮下降，因而降低了dλ///dH、K及ΔEs/E0等物理性質。最後對比計算與實驗之ΔEs/E0與K2關係，並發現兩者有良好的一致性。本研究以0.2%之稀土元素R(R=Tb、Dy、Ho)參雜成功提升了Fe87-xGa13@Rx合金磁機械性質。
In this study, The effect of quenching and re element R(R=Tb, Dy, Ho) on magnetic - mechanical coupling of Fe87Ga13 alloy was studied. Found in hardening quenching effect, can effectively improve magnetic - mechanical coupling Fe87Ga13 alloy properties (include: KE, is deduced, d lambda/dH, Δ Es/E0, Δ Gs/G0). Among them, the damping capacity of Fe87Ga13 alloy increased by 74% after quenching, and was highly consistent with the theoretical calculation rate (88%) of damping capacity contributed by magnetic resonance. It is shown that the enhancement of quenching damping capacity of Fe87Ga13 alloy is dominated by the microscopic eddy current mechanism caused by magnetic field wall resonance. After quenching treatment of Fe87Ga13 alloy (200) texture, is different from the furnace cooling (110) texture of alloy, the influence the coupling characteristics of magnetic - mechanical (include: d lambda/dH and Δ E/E0 and Δ G/G0) and magnetic structure, and lead to Fe87Ga13 alloy damping capacity is deduced and the magnetic mechanical coupling factors KE. In addition, in Dy mixed effect, found that 0.2% mixed Dy and quenching can make Fe87Ga13 yang-style coefficient E quan changes of alloy under magnetic field (Δ E/E0) increase greatly. In plus H = 2.5 under the test conditions of kOe, Δ E/E0 can be increased from 6.1% to 12.0%, the increase of nearly 100%. In addition, alloy Fe86.8 ga13dy0.2 showed a 9% increase in E at a low field of H=0.25 kOe. It was found by XRD analysis that all the Fe87Ga13 alloys were composed of A2, D03 and D03 variants. With 0.2% mixed Fe87Ga13 alloy with the highest of Dy D03 variant phase fraction, at the same time with the highest lambda / / / d of dH = 0.79 PPM/Oe and Δ E/E0 = 12%. This results in a Fe87Ga13 alloy with 0.2%Dy and a magnetic - mechanical coupling coefficient K of up to 22%. But excessive Dy lower D03 variant phase ratio (x > 2%) and increase the rate of D03 phase points, led to the decrease of the magnetostriction, and thus reduce the lambda / / / dH, K and d Δ Es/E0 and other physical properties. The contrast calculation and experiment Δ Es/E0 and K2, and found that both have good consistency. In this study, 0.2% rare-earth elements R(R=Tb, Dy, Ho) were used to improve the magnetic mechanical properties of Fe87-xGa13Rx alloy.Keywords: Galfenol, Rare-earth element doping, magneto- |
