采用粉末冶金方法制备具有高密度L12纳米析出相的富镍镍铬基中熵合金

IF 7 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Hong Huang , Zixuan Wu , Lanping Huang , Song Li
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引用次数: 0

摘要

采用气雾化-放电等离子烧结法制备了一种富镍镍铬基中熵合金(MEA)。通过控制烧结温度在1200℃,获得了完全再结晶的双相组织,由面心立方(FCC)基体和高密度均匀分散的L12纳米相组成(尺寸为20 ~ 45 nm,占58 ~ 60 vol%)。这种独特的微观结构显著提高了合金的力学性能。(Ni3.5Co3Cr1.5)90Al5Ti5 MEA具有优异的力学性能,屈服强度为1055±10 MPa,极限抗拉强度为1411±5 MPa,伸长率为24.33±0.3%。这种强度和延展性的优异结合主要归功于高密度L12纳米相的协同作用,退火和变形孪晶的发生,以及平均尺寸为6.46 μm的超细晶粒的细化。与1000℃烧结试样相比,1200℃烧结试样的相对密度更高,层错增多,变形孪晶增多,有效地缓解了应力集中,提高了塑性。这项工作不仅提高了我们对非等原子MEAs的理解,而且为开发具有定制性能的新型工程金属材料开辟了新的途径。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Achieving high strength and ductility in Ni-rich NiCoCr-based medium-entropy alloy with high-density L12 nano-precipitates by powder metallurgy
A Ni-rich NiCoCr-based medium-entropy alloy (MEA) was successfully fabricated via gas atomization followed by spark plasma sintering (SPS). By controlling the sintering temperature at 1200 °C, a fully recrystallized dual-phase microstructure was achieved, consisting of a face-centered cubic (FCC) matrix and a high density of uniformly dispersed L12 nano-precipitates (20–45 nm in size, occupying 58–60 vol%). This unique microstructure significantly improved the mechanical characteristics of the alloy. The (Ni3.5Co3Cr1.5)90Al5Ti5 MEA demonstrated outstanding mechanical properties, achieving a yield strength of 1055 ± 10 MPa, an ultimate tensile strength of 1411 ± 5 MPa, and an elongation of 24.33 ± 0.3 %. This exceptional integration of strength and ductility was primarily attributed to the synergistic influence of high-density L12 nano-precipitates, the occurrence of annealing and deformation twins, and the refinement of ultrafine grains, averaging 6.46 μm in size. Compared with the sample sintered at 1000 °C, the sintered sample at 1200 °C demonstrated higher relative density, increasing stacking faults, and more deformation twins, which effectively alleviated stress concentration and improved plasticity. This work not only enhances our comprehension of non-equiatomic MEAs but also opens up a new pathway for developing new engineering metallic materials with tailored properties.
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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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