Preparation of a novel high-entropy alloy AlNbTiVZr with excellent strength and ductility: The effect of Zr composition on microstructure and properties

IF 6.1 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Yuchi Fang, Zhangping Hu, Jinsheng Ji, Longxiang Sun, Leilei Wang, Xiaohong Zhan
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Abstract

Light-weight refractory high-entropy alloys with low density and good ductility are widely used in various engineering fields. Despite their potential, achieving an optimal strength-ductility balance in these lightweight alloys remains an emerging field of study. In this study, Al0.8Nb0.5Ti2V2Zrx (x = 0, 0.3, 0.6, and 0.9) alloys were prepared by vacuum arc melting. A comprehensive evaluation of their microstructure, density, hardness, and compressive behavior at both room and 873 K temperatures was conducted. The introduction of Zr transforms the alloy phase structure from body-centered cubic (BCC) to BCC + C14-Laves. The areal fraction of the C14-Laves phase increased from 0 % to 32.47 % with increasing Zr content from x = 0 to 0.9, respectively. Furthermore, the Zr content had an obvious effect on the mechanical properties of the alloys. The compressive strength and hardness of the alloys improved, but the ductility simultaneously decreased, with increasing Zr content. The yield strengths of the alloys with x = 0, 0.3, 0.6, and 0.9 reached 971, 1216, 1483, and 1714 MPa, respectively, at room temperature, and 946, 1287, 1319, and 1469 MPa, respectively, at 873 K. In addition, the alloys maintained their deformation resistance and good ductility at 873 K. In particular, the Al0.8Nb0.5Ti2V2Zr0.3 exhibited a good balance between strength and ductility at room and 873 K temperatures due to the strengthening effect of a granular secondary phase. Upon comparison with other reported high-entropy alloys, the Al0.8Nb0.5Ti2V2Zrx series showcased superior specific yield strength and ductility.
制备具有优异强度和延展性的新型高熵合金 AlNbTiVZr:Zr 成分对微观结构和性能的影响
具有低密度和良好延展性的轻质耐火高熵合金被广泛应用于各个工程领域。尽管这些轻质合金潜力巨大,但如何实现强度与延展性的最佳平衡仍是一个新兴的研究领域。本研究采用真空电弧熔炼法制备了 Al0.8Nb0.5Ti2V2Zrx(x = 0、0.3、0.6 和 0.9)合金。对它们在室温和 873 K 温度下的微观结构、密度、硬度和抗压性能进行了全面评估。Zr 的引入使合金相结构从体心立方(BCC)转变为 BCC + C14-Laves。随着 Zr 含量从 x = 0 到 0.9 的增加,C14-Laves 相的面积分数分别从 0 % 增加到 32.47 %。此外,锆含量对合金的机械性能也有明显的影响。随着锆含量的增加,合金的抗压强度和硬度提高,但延展性同时降低。x=0、0.3、0.6 和 0.9 的合金在室温下的屈服强度分别达到了 971、1216、1483 和 1714 兆帕,在 873 K 下的屈服强度分别达到了 946、1287、1319 和 1469 兆帕。特别是 Al0.8Nb0.5Ti2V2Zr0.3,由于粒状次生相的强化作用,在室温和 873 K 温度下都能很好地平衡强度和延展性。与其他已报道的高熵合金相比,Al0.8Nb0.5Ti2V2Zrx 系列具有更高的比屈服强度和延展性。
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来源期刊
Materials Science and Engineering: A
Materials Science and Engineering: A 工程技术-材料科学:综合
CiteScore
11.50
自引率
15.60%
发文量
1811
审稿时长
31 days
期刊介绍: Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.
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