Enhancement of the mechanical strength in laser powder bed fused La/Ce-rich La-Ce-Fe-Co-Si magnetocaloric materials via crack healing

IF 5.5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2025-09-18 DOI:10.1016/j.matchar.2025.115572

Kai Xu , Xiang Lu , Xiang Li , Chunfeng Lao , Jing Li , Guoxin Yu , Jian Liu

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Abstract

Laser powder bed fusion (LPBF) has been recently adopted to prepare magnetocaloric La(Fe,Si)₁₃-based alloys due to geometry design freedom and near-net-shape features. However, the as-printed sample showed pronounced cracks which hindered their application. Here, La/Ce-rich La-Ce-Fe-Co-Si alloys were prepared by LPBF and the microstructural evolution after 30 min of short annealing was investigated. The as-printed sample consisted of uniformly fine La/Ce-rich and α-Fe(Co,Si) phases with many cold cracks. Notably, these cracks were filled with La/Ce oxides during annealing, leading to a certain degree of healing. Owing to the crack healing effect and the fine microstructure, an excellent compressive strength of 570 MPa was obtained. The annealed samples contained 79.06 wt% of NaZn₁₃-type phases, and the magnetic entropy change was −7.48 J·kg⁻¹·K⁻¹ for a magnetic field change of 0–5 T. This research presents a promising route of rare-earth rich composition design for obtaining high-strength La(Fe,Si)₁₃-based magnetic refrigerants by the LPBF method.

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激光粉末床熔接富La/ ce - La- ce - fe - co - si磁热材料的裂纹愈合增强力学强度

激光粉末床熔合（LPBF）由于具有几何设计自由和近净形状的特点，被广泛用于制备磁致热La(Fe,Si)13基合金。然而，打印样品显示明显的裂纹，这阻碍了它们的应用。利用LPBF制备了富La/ ce的La- ce - fe - co - si合金，并研究了短时间退火30 min后的显微组织演变。打印样品由均匀细小的富La/ ce相和α-Fe（Co,Si）相组成，并伴有许多冷裂纹。值得注意的是，这些裂纹在退火过程中被La/Ce氧化物填充，导致一定程度的愈合。由于具有良好的裂纹愈合效果和良好的微观组织，获得了优异的抗压强度，达到570 MPa。退火后的样品中，nazn13型相的含量为79.06 wt%，在0 ~ 5 t的磁场变化下，磁熵变化为−7.48 J·kg−1·K−1。本研究为利用LPBF方法制备高强度La(Fe,Si)13基磁性制冷剂提供了一条有前途的富稀土成分设计途径。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.