A novel corrosion resistant NiFeCrAlTi eutectic high entropy alloy with high strength and ductility

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Materials Characterization Pub Date : 2024-10-22 DOI:10.1016/j.matchar.2024.114479

Chenyu Zhai , Zhimin Yang , Shilin Feng , Yongfu Cai , Zhenhua Han , Hongyan Wang , Chen Chen , Tan Wang , Shaojie Wu , Haimei Li , Ran Wei

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Abstract

We present a novel corrosion resistant Ni_42.6Fe_24.6Cr_16.4Al_13.4Ti₃ eutectic high entropy alloy (EHEA), which consists of FCC(L1₂) phase and BCC(L2₁) phase. The FCC and BCC phases contain numerous nano-precipitates, with sizes of ∼10 nm and 80 nm, respectively. The as-cast EHEA exhibits exceptional mechanical properties with a yield strength of ∼730 MPa, an ultimate tensile strength of 1220 MPa and elongation of 25 %, surpassing those observed in other as-cast EHEAs. The excellent mechanical properties are attributed to the extensive dislocation activities and precipitation strengthening in both BCC and FCC phases, as well as hetero-deformation induced (HDI) strengthening. Besides, the Kurdjumov-Sachs (KS) orientation relationship between adjacent phases promotes the cooperative deformation of both constituent phases, thereby enhancing the ductility of the EHEA.

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具有高强度和延展性的新型耐腐蚀镍铁铬铝钛共晶高熵合金

我们提出了一种新型耐腐蚀镍42.6铁24.6铬16.4铝13.4钛3共晶高熵合金（EHEA），它由FCC（L12）相和BCC（L21）相组成。FCC 相和 BCC 相含有大量纳米沉淀物，大小分别为 10 纳米和 80 纳米。铸件 EHEA 具有优异的机械性能，屈服强度达 730 兆帕，极限拉伸强度达 1220 兆帕，伸长率达 25%，超过了其他铸件 EHEA。优异的机械性能归功于 BCC 和 FCC 相中广泛的位错活动和沉淀强化，以及异变形诱导（HDI）强化。此外，相邻相之间的库尔朱莫夫-萨克斯（KS）取向关系促进了两个组成相的协同变形，从而提高了 EHEA 的延展性。

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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.