Tailoring microstructures and tensile properties of a precipitation-strengthened (FeCoNi)94Ti6 medium-entropy alloy
Tailoring microstructures and tensile properties of a precipitation-strengthened (FeCoNi)94Ti6 medium-entropy alloy
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沉淀强化 (FeCoNi)(94)Ti-6 中熵合金的微观组织和拉伸性能
DOI：
10.1016/j.jallcom.2020.154457
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发表时间：
2020-07-05
影响因子：
6.2
通讯作者：
Liu, C. S.
中科院分区：
文献类型：
--
作者：
Chen, Y.;Deng, H. W.;Liu, C. S.
通过添加少量Ti，设计并实现了fcc-FeCoNi中熵合金（MEA）基体中L1(2)型Ni3Ti纳米团簇和纳米级颗粒的共晶析出。通过热机械加工和各种退火处理来调节合金的力学性能，从而形成不同的位错强化和析出强化机制。由于L1(2)型Ni3Ti纳米相的析出强化，可以实现屈服强度（类似893 MPa）、极限抗拉强度（类似1263 MPa）和延展性（类似24%伸长率）的良好组合。本研究不仅对理解金属材料的强化机制具有重要意义，而且为通过微观组织调控获得理想的合金力学性能提供了一种通用方法。(C) 2020 Elsevier B.V.版权所有
The coherent precipitate L1(2)-type Ni3Ti nanoclusters and nano-sized particles in a fcc-FeCoNi medium-entropy alloy (MEA) matrix were designed and realized through minor Ti addition. The mechanical properties were modulated by thermo-mechanical processing and various annealing treatments, which leads to different hardening mechanisms such as dislocation strengthening and precipitation strengthening. An excellent combination of yield strength (similar to 893 MPa), ultimate tensile strength (UTS similar to 1263 MPa) and ductility (similar to 24% elongation) can be achieved because of the precipitation strengthening from the L1(2) type Ni3Ti nano-sized precipitates. The present study is important not only for understanding the strengthening mechanisms of metallic materials, but also provides a generic way to obtain the desirable mechanical properties of alloys via microstructural regulation. (C) 2020 Elsevier B.V. All rights reserved.