覃红星,王宇,解蓓蓓,等.高熵铝化物微叠层复合材料增-等材制备及组织性能研究[J].精密成形工程,2025,17(1):153-163.
QIN Hongxing,WANG Yu,XIE Beibei,et al.Additive-equal Material Fabrication and Microstructural Properties of High Entropy Aluminide Microlaminated Composites[J].Journal of Netshape Forming Engineering,2025,17(1):153-163. |
| 高熵铝化物微叠层复合材料增-等材制备及组织性能研究 |
| Additive-equal Material Fabrication and Microstructural Properties of High Entropy Aluminide Microlaminated Composites |
| 投稿时间：2024-05-23 |
| DOI：10.3969/j.issn.1674-6457.2025.01.018 |
| 中文关键词: 增-等材制备 微叠层复合材料 高熵合金 动态压缩强度 断裂韧性 |
| 英文关键词: additive-equal material fabrication microlaminated composites high entropy alloy dynamic compressive strength fracture toughness |
| 基金项目:山西省基础研究计划面上项目(202103021224179) |
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| 摘要点击次数: 49 |
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| 中文摘要: |
| 目的 研究高熵合金和铝增-等材复合制备材料的成形性能，以及制备的高熵铝化物微叠层复合材料的组织和力学性能。方法 首先研究了高熵合金和铝的复合材料增-等材制备各环节的成形性能，然后使用SEM、EDS、XRD分析了复合材料铝化物层的微观组织和生长动力学，最后从显微硬度、三点弯曲性能、断裂韧性、动态压缩强度的角度研究了复合材料的力学性能。结果 选区激光烧结成形的实物没有翘曲、弯曲等明显宏观缺陷，渗流铸造的复合材料孔洞较多，个别区域出现了较大尺寸的缺陷，真空热压烧结使复合材料结合紧实;复合材料的扩散行为是高熵合金扩散到Al层，Al基本不发生扩散;复合材料铝化物层的显微硬度高于铸造和SPS制备的高熵合金的显微硬度，随着靠近Al层，硬度呈降低现象，三点弯曲性能和断裂韧性随反应时间的延长而降低，动态压缩强度随反应时间的延长而提高。结论 高熵铝化物微叠层复合材料的增-等材复合制备材料成形性能良好;复合材料铝化物层的组织组成是Al3(Co,Cr,Fe,Ni)，扩散层生长是晶内扩散和界面反应控制的混合型生长;铝化物层对复合材料性能的影响很大，其厚度增加，使复合材料三点弯曲性能和断裂韧性降低，动态压缩强度提高。 |
| 英文摘要: |
| The work aims to study the formability of high entropy alloy (HEA) and Al reinforced composites using the technique of additive-equal material fabrication, as well as the microstructure and mechanical properties of the prepared high entropy aluminide microlaminated composites. Firstly, the formability of the composites in the preparation process of additive-equal material fabrication was studied. Subsequently, the microstructure and growth kinetics of the composites' aluminide layer were analyzed by SEM, EDS, and XRD. Finally, the mechanical properties of the composites were investigated from the perspectives of microhardness, three-point bend, fracture toughness, and dynamic compressive strength. The physical objects fabricated by laser sintering melting exhibited no obvious macroscopic defects such as warping or bending, while the composites fabricated by vacuum drift casting contained more voids, with some areas showing larger defects, and the aluminide composites fabricated by vacuum hot press sintering behaved very tightly. The diffusion behaviour of composites involved the diffusion of high entropy alloys into the Al layer, where Al underwent minimal diffusion. The microhardness of the aluminide layer was higher than that of the as-cast and spark plasma sintering prepared high entropy alloy. Near the Al layer, there was a decrease in hardness. The three-point bend and fracture toughness decreased with increasing reaction time. The dynamic compressive strength increased with prolonged reaction time. High entropy aluminide microlaminated composites prepared by additive-equal material fabrication has good formability. The microstructure composition of the aluminide layer of the composites is Al3(Co Cr Fe Ni), the aluminide diffusion layer shows a hybrid growth controlled by internal diffusion and interfacial reactions. The thickness of the aluminide layer has a significant impact on the performance of the composites. As the thickness increases, the three-point bend and fracture toughness of the composites decreases while the dynamic compressive strength increases. |
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