Excellent strength-ductility synergy in oxide dispersion strengthened AlCrFeNi high-entropy composites by heterostructure strategy

IF 6.1 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Xiaolong Li, Zheng Lu, Dingbo Sun, Shang Gao
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Abstract

Oxide dispersion strengthened (ODS) AlCrFeNi high-entropy composites were produced by different heterostructure strategies to achieve strength and ductility synergy. The effects of different reinforcement types, reinforcement contents and oxide-forming elements in the matrix on the microstructure and mechanical properties of ODS-AlCrFeNi composites were investigated. The results showed that in the composites with different reinforcement types (ternary ODS-CrFeNi, quaternary ODS-CoCrFeNi and quinary ODS-CoCrFeNiMn), spinodal decomposition is observed in the all reinforcements, resulting in the formation of ellipsoidal/cuboidal B2-structured NiAl-rich phase and BCC-structured FeCr phases. As the number of the principal elements in the reinforcing phase decreases, the spinodal decomposition size gradually decreases. In the composites with varying ODS-CrFeNi reinforcement contents (5 %, 10 %, 15 %, 20 %), the occurrence of spinodal decomposition is also observed in the reinforcement. The spinodal decomposition size in the composite with 15 % and 20 % reinforcement content is smaller than that with 5 % and 10 % content. It is noteworthy that the incorporation of oxide-forming elements of Zr and Ti or only Zr together with Y2O3 in to the matrix result in different reinforcement structures. The former is typical spinodal decomposition, whereas latter displays a gradient network structure comprising a FCC-structured FeNi phase and a BCC-structured Cr-rich phase. The superior strength-ductility synergy, a compressive strength and strain of 7690 MPa and 15.5 %, which are 2.7 and 2 times higher than those of the unreinforced reference alloy, respectively, is achieved. This is mainly contributed by the novel gradient network structure in the reinforcement.
异质结构氧化分散增强AlCrFeNi高熵复合材料的强延性协同效应
采用不同的异质结构策略制备氧化分散增强(ODS) AlCrFeNi高熵复合材料,以实现强度和延性的协同。研究了基体中不同增强类型、增强含量和氧化形成元素对ODS-AlCrFeNi复合材料显微组织和力学性能的影响。结果表明:在不同增强类型(三元ODS-CrFeNi、四元ODS-CoCrFeNi和五元ODS-CoCrFeNiMn)的复合材料中,所有增强类型均发生独立分解,形成椭球/立方b2结构的富nial相和bcc结构的FeCr相;随着增强相主元素数量的减少,旋多分解尺寸逐渐减小。在不同ODS-CrFeNi增强含量(5%、10%、15%、20%)的复合材料中,增强材料也出现了旋散分解现象。增强率为15%和20%的复合材料的分解尺寸小于增强率为5%和10%的复合材料。值得注意的是,在基体中加入氧化元素Zr和Ti或仅加入Zr和Y2O3会形成不同的增强结构。前者为典型的spinodal分解,而后者呈现由fcc结构的FeNi相和bcc结构的富cr相组成的梯度网络结构。抗压强度和应变分别达到7690 MPa和15.5%,分别是未加筋基准合金的2.7倍和2倍。这主要是由于在加固中采用了新颖的梯度网络结构。
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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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