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| TiZrV-(Ta)中熵合金组织及性能研究 |
| Microstructure and Properties of TiZrV-(Ta) Medium-entropy Alloy |
| Received:December 12, 2024 |
| DOI：10.3969/j.issn.1674-6457.2025.05.011 |
| 中文关键词: 中熵合金 真空电弧熔炼法 微观组织 相结构 力学性能 |
| 英文关键词: medium-entropy alloys vacuum arc melting method microstructure phase structure mechanical properties |
| 基金项目:国家自然科学基金(52375393，52071299);山西省科技创新人才团队资助项目(202304051001029);山西省科技成果转化引导专项(202204021301048);山西省重点研发计划(2210300058MZ，202202150401020，202302110401015) |
| Author Name | Affiliation | | PAN Tao | School of Materials Science and Engineering,Taiyuan 030051, China | | LI Qianru | School of Materials Science and Engineering,Taiyuan 030051, China | | ZHANG Li | School of Materials Science and Engineering,Taiyuan 030051, China | | LI Xiaofeng | School of Materials Science and Engineering,Taiyuan 030051, China | | WANG Jianhong | School of Materials Science and Engineering,Taiyuan 030051, China | | FU Jianping | Intelligent Weapon Research Institute, North University of China, Taiyuan 030051, China |
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| 中文摘要: |
| 目的 制备高性能TiZrV基中熵合金，探究Ta微合金化对TiZrV中熵合金组织演变和力学性能的影响。方法 通过真空电弧熔炼法制备了TiZrV和TiZrVTa0.1中熵合金，采用金相显微镜、扫描电子显微镜、X射线衍射仪、维氏硬度计、万能力学性能测试机等手段分析了Ta元素对TiZrV中熵合金微观组织、相结构和力学性能的影响。结果 TiZrV和TiZrVTa0.1中熵合金均呈现出枝晶组织。TiZrV合金基体中均匀、疏散分布着条粒状第二相;添加Ta元素后，合金的枝晶更密集，第二相也更加细小弥散，整体表现为相间不规则排布的条状和花纹状。相比于TiZrV合金，TiZrVTa0.1中熵合金具有更高的强度和塑性，抗压强度提高了28%，达到(1 160±10.6)MPa，抗拉强度提高了40%，达到(752±5.4)MPa，断裂延伸率从(7.6±0.13)%上升至(10.1±0.28)%，硬度最高达到326.1HV0.2。拉伸断口分析表明，添加Ta元素后，合金韧窝数量增加并且深度不断加深，促进了材料从脆性断裂向韧性断裂转变，塑性得到改善，实现了较好的强韧性配合。结论 力学性能的提高主要归结于Ta原子的固溶强化、第二相的强化作用和微观结构的改变。 |
| 英文摘要: |
| The work aims to develop high-performance TiZrV-based medium-entropy alloys and investigate the effects of Ta microalloying on the microstructural evolution and mechanical properties of TiZrV medium-entropy alloys. TiZrV and TiZrVTa0.1 medium-entropy alloys were prepared by vacuum arc melting. The effects of Ta on the microstructure, phase composition, and mechanical properties of TiZrV medium-entropy alloys were analyzed by optical microscopy, scanning electron microscopy, X-ray diffraction, Vickers hardness testing, and universal mechanical testing machine. Both TiZrV and TiZrVTa0.1 alloys exhibited a dendritic microstructure. In the TiZrV alloy, the matrix contained sparsely distributed lath-like and granular second phases. After the addition of Ta, the dendrites became denser, and the second phases were refined and dispersed more uniformly, forming irregularly arranged lath-like and patterned interphases. Compared with TiZrV, the TiZrVTa0.1 alloy demonstrated superior strength and ductility, with compressive strength increasing by 28% to (1 160±10.6) MPa, tensile strength rising by 40% to (752±5.4) MPa, and elongation improving from (7.6±0.13)% to (10.1±0.28)%. The maximum hardness reached 326.1HV0.2. Fractographic analysis revealed an increased number and depth of dimples in the Ta-alloyed specimen, indicating a transition from brittle to ductile fracture, thereby enhancing plasticity and achieving an optimal strength-ductility balance. The improvement in mechanical properties is primarily attributed to solid solution strengthening by Ta atoms, second-phase strengthening, and the alterations in microstructural characteristics. |
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