Enhancement in hard magnetic properties of nanocrystalline (Ce,Y)–Fe–Si–B alloys due to microstructure evolution caused by chemical heterogeneity,Journal of Materials Chemistry C

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Enhancement in hard magnetic properties of nanocrystalline (Ce,Y)–Fe–Si–B alloys due to microstructure evolution caused by chemical heterogeneity
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2020-09-30 , DOI: 10.1039/d0tc03011b
J. S. Zhang _{1,

2,

3,

4} , X. F. Liao _{1,

2,

3,

4} , K. Xu _{1,

2,

3,

4} , J. Y. He _{1,

2,

3,

4} , W. B. Fan _{1,

2,

3,

4} , H. Y. Yu _{1,

2,

3,

4} , X. C. Zhong _{1,

2,

3,

4} , Z. W. Liu _{1,

2,

3,

4}

Affiliation

To release the pressure on the supply of critical rare earths (REs), much effort has been made to substitute Nd and Pr by more highly abundant La, Ce, and Y elements in Nd–Fe–B magnets. The chemical heterogeneity reported in multi-main-phase sintered magnets is a promising solution to suppress the magnetic dilution of La-, Ce-, or Y-added Nd–Fe–B magnets. Here, we investigated the nanocrystalline (Ce_1−xY_x)₁₇Fe₇₅Si₃B₆ (x = 0–0.6) alloys prepared by melt spinning and observed an unusual chemical heterogeneity in the (Ce_0.5Y_0.5)₁₇Fe₇₅Si₃B₆ alloy. Here, the Y segregation in RE₂Fe₁₄B (2 : 14 : 1) phase and Ce segregation in REFe₂ (1 : 2) phase were demonstrated due to the significantly different Ce and Y diffusion rates in these two phases. As a result, an extremely high coercivity H_c of 432 kA m⁻¹ and a greatly enhanced maximum energy product (BH)_max of 7.1 MGOe with Curie temperature T_c of 547 K were obtained. In the alloys with x = 0.1–0.4, H_c decreased with Y substitution but the remanence J_r, (BH)_max and T_c did not increase significantly despite the higher magnetization M_s and T_c of the Y₂Fe₁₄B phase than those of Ce₂Fe₁₄B. The reason for this could be attributed to the formation of a large amount of 1 : 2 phase and the insignificant Y and Ce segregations. For the alloy with x = 0.6, though a further increase of J_r was obtained, (BH)_max value of 7.2 MGOe was similar to that of the alloy with x = 0.5 because H_c was significantly reduced. The unique microstructural evolution was responsible for the notable change in magnetic properties. The nano-level chemical heterogeneity manifested by the present work offers a potential approach to improve the cost performance and understand the physical mechanism of free-RE magnets.

中文翻译：

由于化学异质性导致的微观结构演变，增强了纳米晶（Ce，Y）–Fe–Si–B合金的硬磁性能

为了释放对关键稀土（REs）的压力，已经做出了很多努力，用Nd-Fe-B磁体中含量更高的La，Ce和Y元素替代Nd和Pr。多主相烧结磁体中报道的化学异质性是抑制添加La，Ce或Y的Nd-Fe-B磁体的磁稀释的一种有前途的解决方案。在这里，我们研究了通过熔融纺丝制备的纳米晶（Ce _{1- x} Y _x）₁₇ Fe ₇₅ Si ₃ B ₆（x = 0-0.6）合金，并观察到（Ce _0.5 Y _0.5）₁₇ Fe _75中存在异常的化学异质性硅₃ B₆合金。在这里，由于这两个相中Ce和Y的扩散速率显着不同，证明了RE₂ Fe₁₄ B（2：14：1）相中的Y偏析和REFe₂（1：2）相中的Ce偏析。结果，在居里温度T _c为547 K的情况下，获得了432 kA m^-1的极高矫顽力H _c和7.1 MGOe的极大提高的最大能量乘积（ BH）_max。在x = 0.1–0.4的合金中， H _c随着Y的取代而降低，但剩磁J _r，（尽管Y ₂ Fe ₁₄ B相的磁化强度M _s和T _c高于Ce ₂ Fe ₁₄ B的磁化强度M _s和T _c，但BH）_max和T _c并未显着增加。其原因可能是由于大量的形成1：2相的分布以及不明显的Y和Ce偏析。对于x = 0.6的合金，尽管J _r进一步增加，但（BH）_最大值为7.2 MGOe与x = 0.5的合金相似，因为H_c明显降低。独特的微观结构演变是磁性能显着变化的原因。当前工作所表现出的纳米级化学异质性提供了一种潜在的途径来提高成本性能并了解自由稀土磁体的物理机理。

更新日期：2020-10-14

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