Additive manufacturing synthesis using laser engineered net shaping (LENS) is utilized to rapidly print libraries of mischmetal (MM = La, Ce, Nd, and Pr) containing R2TM14B alloys (R = MM + separated Nd and TM = Fe and Co) enabling robust evaluation of physical properties over a wide composition range. High-throughput characterization of the magnetic and thermal properties are used to identify compositions for potential high-temperature, high-performance permanent magnets with reduced critical rare-earth elements. Improved Curie temperature (Tc ∼ 450 °C) is obtained with substitution of Fe by Co in pseudoternary R2TM14B alloys. Furthermore, a 4-fold decrease in the Nd content can be achieved through substitution with less critical Ce- and La-rich MM, while retaining high Tc. Guided by the properties of the LENS printed samples, selected compositions with and without TiC additions are synthesized via melt-spinning techniques to produce nanostructured ribbons. The maximum room temperature coercivity (Hc) and energy product ((BH)max) without TiC are found to be 5.8 kOe, 8.5 MGOe, respectively, while TiC additions as a grain refiner gave Hc and (BH)max of 4.9 kOe, 9.8 MGOe, respectively. Structural characterization of the melt-spun ribbons shows homogeneous grain refinement with TiC additions, which leads to an increase in the energy product.

中文翻译：

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通过高通量方法开发Mischmetal-Fe-Co-B永磁合金。

利用激光工程网成形（LENS）的增材制造合成技术可快速打印包含R2TM14B合金（R = MM +分离的Nd和TM = Fe和Co）的混合金属（MM = La，Ce，Nd和Pr）库广泛的组成范围内的物理性能评估。磁性能和热性能的高通量表征可用于识别具有减少的临界稀土元素的潜在高温，高性能永磁体的成分。通过在伪三元R2TM14B合金中用Co代替Fe，可以获得更高的居里温度（Tc〜450°C）。此外，通过用不太关键的富含Ce和La的MM替代，同时保持高Tc，可以使Nd含量降低4倍。遵循LENS打印样本的属性，通过熔融纺丝技术合成具有和不具有TiC添加物的选定组合物以产生纳米结构的带。发现没有TiC的最大室温矫顽力（Hc）和能量乘积（（BH）max）分别为5.8 kOe，8.5 MGOe，而添加TiC作为晶粒细化剂时，Hc和（BH）max分别为4.9 kOe，9.8 MGOe，分别。熔纺薄带的结构特征表明，添加TiC可以使晶粒细化，从而提高了能量积。分别。熔纺带材的结构表征表明，添加TiC可以使晶粒细化，从而提高了能量积。分别。熔纺带材的结构表征表明，添加TiC可以使晶粒细化，从而提高了能量积。