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A Seawater-Corrosion-Resistant and Isotropic Zero Thermal Expansion (Zr,Ta)(Fe,Co)2 Alloy
Advanced Materials ( IF 27.4 ) Pub Date : 2022-06-30 , DOI: 10.1002/adma.202109592
Wenjie Li 1 , Kun Lin 1 , Yu Yan 1 , Chengyi Yu 1 , Yili Cao 1 , Xin Chen 1 , Chin-Wei Wang 2 , Kenichi Kato 3, 4 , Yan Chen 5 , Ke An 5 , Qinghua Zhang 6 , Lin Gu 6 , Qiang Li 1 , Jinxia Deng 1 , Xianran Xing 1
Affiliation  

Zero thermal expansion (ZTE) alloys as dimensionally stable materials are usually challenged by harsh environmental erosion, since ZTE and corrosion resistance are generally mutually exclusive. Here, a high-performance alloy, Zr0.8Ta0.2Fe1.7Co0.3, is reported, that shows isotropic ZTE behavior (αl = 0.21(2) × 10−6 K−1) in a wide temperature range of 5–360 K, high corrosion resistance in a seawater-like solution compared with classic Invar and stainless Invar, and excellent cyclic thermal and structural stabilities. Such stabilities are attributed to the cubic symmetry, the controllable magnetic order, and the spontaneously formed passive film with Ta and Zr chemical modifications. The results are evidenced by X-ray/neutron diffraction, microscopy, spectroscopy, and electrochemistry investigations. Such multiple stabilities have the potential to broaden the robust applications of ZTE alloys, especially in marine services.

中文翻译:

一种耐海水腐蚀的各向同性零热膨胀 (Zr,Ta)(Fe,Co)2 合金

零热膨胀 (ZTE) 合金作为尺寸稳定的材料通常会受到恶劣环境侵蚀的挑战,因为 ZTE 和耐腐蚀性通常是相互排斥的。在这里,报道了一种高性能合金 Zr 0.8 Ta 0.2 Fe 1.7 Co 0.3,它表现出各向同性的 ZTE 行为 (α l  = 0.21(2) × 10 -6 K -1) 在 5–360 K 的宽温度范围内,与经典的因瓦合金和不锈钢因瓦合金相比,在类似海水的溶液中具有更高的耐腐蚀性,以及出色的循环热稳定性和结构稳定性。这种稳定性归因于立方对称性、可控的磁序以及具有 Ta 和 Zr 化学修饰的自发形成的钝化膜。结果通过 X 射线/中子衍射、显微镜、光谱学和电化学研究得到证实。这种多重稳定性有可能拓宽中兴合金的稳健应用,特别是在海洋服务中。
更新日期:2022-06-30
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