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Tb0.3Dy0.7Fe1.95-xNbx (x=0, 0.03, 0.06, 0.09) 合金的組織與磁致伸縮性能
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國家自然科學(xué)基金（11004091）；浙江省自然科學(xué)基金（Y4090219）；甘肅省自然科學(xué)基金（0916RJZA025）


Microstructure and Magnetostriction of Tb0.3Dy0.7Fe1.95-xNbx (x=0, 0.03, 0.06, 0.09) Alloys
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    摘要:

    采用高真空電弧爐制備了Tb0.3Dy0.7Fe1.95-xNbx (x=0, 0.03, 0.06, 0.09) 合金，研究了該系列合金的晶體結(jié)構(gòu)、微觀組織及磁致伸縮性能。結(jié)果表明：添加Nb元素后的Tb0.3Dy0.7Fe1.95-xNbx (x=0.03, 0.06, 0.09) 合金基體相結(jié)構(gòu)仍保持為MgCu2 (C15型) 立方Laves相，添加Nb后Tb0.3Dy0.7Fe1.95-xNbx合金基體相晶格常數(shù)幾乎不變。Nb在基體相RFe2中和富Re相中都不溶，但在x=0.03時(shí)的RFe3相中微溶而形成Re(Nb,Fe)3相。初生相NbFe2（C14型）相的形成使凝固液體富稀土從而抑制了RFe3有害相形成。六方結(jié)構(gòu)的NbFe2在與自身結(jié)構(gòu)不同的RFe2（C15型）中不溶而單獨(dú)成為一相存在于RFe2基體上。Nb的添加量x對磁致伸縮的影響很大，微量（x=0.03）Nb的添加有效抑制了RFe3有害相的生成而使得磁致伸縮性能提高最大，但當(dāng)Nb含量繼續(xù)增大時(shí)，由于順磁相NbFe2和富Re相的析出影響了基體磁-彈性交互作用而使磁效伸縮性能下降。但相對于Tb0.3Dy0.7Fe1.95母合金都有少量提高。

    Abstract:

    The Tb0.3Dy0.7Fe1.95-xNbx (x=0, 0.03, 0.06, 0.09) alloys were prepared by a high-vacuum arc melting furnace. The crystal structure, microstructure and magnetostriction of the alloys were studied. Results demonstrate that after Nb addition the matrix phase of the Tb0.3Dy0.7Fe1.95-xNbx (x=0.03, 0.06, 0.09) alloys consists predominantly of the cubic Laves phase with MgCu2 (C15-type) structure, and the lattice parameter of the Laves phase in the alloys is least affected. Nb is soluble negligibly in the matrix RFe2 and Re-rich phases, but dissolved in the RFe3 phase and formed into Re(Nb,Fe)3 phase when x=0.03. The formation of the NbFe2 phase as the primary phase make the solidifying liquid become rich in rare earths and suppress the formation of the deleterious RFe3 phase. The hexagonal C14-type Laves phase NbFe2 does not dissolve into the matrix RFe2 (C15-type) phase. The concentration of the element Nb affects the magnetostriction significantly. The improvement in magnetostriction is maximum for the element-added alloy with a low concentration of the element Nb (x=0.03) as compared to the parent alloy Tb0.3Dy0.7Fe1.95. However, the decrease in magnetostriction occurs with the increasing of Nb content which is due to the formation of paramagnetic phases NbFe2 and Re-rich phases. Whereas the magnetostriction has a little improvement as compared to the parent alloy Tb0.3Dy0.7Fe1.95.

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李曉誠,丁雨田,胡 勇. Tb0.3Dy0.7Fe1.95-xNbx (x=0, 0.03, 0.06, 0.09) 合金的組織與磁致伸縮性能[J].稀有金屬材料與工程,2012,41(11):2045~2048.[Li Xiaocheng, Ding Yutian, Hu Yong. Microstructure and Magnetostriction of Tb0.3Dy0.7Fe1.95-xNbx (x=0, 0.03, 0.06, 0.09) Alloys[J]. Rare Metal Materials and Engineering,2012,41(11):2045~2048.]
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  • 收稿日期:2011-11-27
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