Overcoming strength-ductility trade-off via L21 precipitate-strengthening in Al0.3CoCrNiTi0.1 high entropy alloy at room and cryogenic temperatures

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-09-20 DOI:10.1016/j.jmrt.2025.09.184

Hamza Iftikhar , Kanghyun Park , Yunjong Jung , Kangjin Lee , Sung Hwan Hong , Ki Buem Kim , Chanho Lee , Gian Song

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引用次数: 0

Abstract

We developed a novel Al_0.3CoCrNiTi_0.1 high entropy alloy (HEA) comprising of face-centered-cubic (FCC) matrix and the L2₁-Ni₂TiAl precipitates. This alloy exhibits exceptional strength-ductility combinations at both room and cryogenic temperatures. The mechanical properties of this alloy increased when the temperature decreased. For instance, the yield strength, tensile strength and ductility at room temperature were estimated to 556, 1134 MPa and 38 %, while those at cryogenic temperature were measured to 682, 1422 MPa and 36 %, respectively. Theoretical calculation of strengthening mechanisms indicated that the strengthening was mainly dominated by L2₁ precipitates. Detailed investigation of deformation mechanisms through electron back-scattered diffraction (EBSD) and transmission electron microscope (TEM) revealed that the enhanced strain-hardening rate at cryogenic temperatures was associated with the L2₁ precipitates, the reduced SF spacing and SF networks. These findings suggest that the Al_0.3CoCrNiTi_0.1 HEA could provide a promising candidate for advanced cryogenic structural applications.

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室温和低温下Al0.3CoCrNiTi0.1高熵合金L21析出强化克服强度-塑性平衡

制备了一种由面心立方（FCC）基体和L21-Ni2TiAl相组成的新型Al0.3CoCrNiTi0.1高熵合金（HEA）。该合金在室温和低温下均表现出优异的强度-延展性组合。该合金的力学性能随着温度的降低而提高。例如，室温下的屈服强度、抗拉强度和塑性分别为556,1134 MPa和38%，低温下的屈服强度、抗拉强度和塑性分别为682,1422 MPa和36%。强化机制的理论计算表明，强化主要以L21相为主。通过电子背散射衍射（EBSD）和透射电子显微镜（TEM）对变形机理进行了详细的研究，结果表明低温下应变硬化率的提高与L21析出相、SF间距和SF网络的减小有关。这些发现表明，Al0.3CoCrNiTi0.1 HEA可以为先进的低温结构应用提供有希望的候选材料。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys

CiteScore

8.80

自引率

9.40%

发文量

1877

审稿时长

35 days

期刊介绍： The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.