Dynamic compression behavior of single-phase and dual-phase Fe-rich medium-entropy alloys

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2025-06-14 DOI:10.1016/j.intermet.2025.108871

Chengfu Han, Zhenyu Du, Ran Wei, Yongfu Cai, Tan Wang, Chen Chen, Shaojie Wu, Fushan Li

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Abstract

The compressive mechanical behavior and deformation mechanisms of Fe-rich medium-entropy alloys with different phase structures were investigated under quasi-static (10⁻⁴ - 10⁻² s⁻¹) and high strain rates (1500 - 6000 s⁻¹) conditions. The results indicated that no fractures or cracks occurred in any of the compressed specimens of the single-phase Fe₅₇Ni₁₈Cr₁₅Si₇Al₃ and dual-phase Fe₆₂Ni₁₃Cr₁₅Si₇Al₃ alloys. Under quasi-static conditions, both alloys exhibited low strain rate sensitivity, with deformation primarily characterized by high-density dislocations and minimal deformation twins or stacking faults. At high strain rates, the yield strength increased significantly. The strain rate sensitivity coefficients (m_d) for the single-phase and dual-phase alloys were 0.081 and 0.089, respectively. In the single-phase alloy, deformation was accompanied by high-density dislocations, deformation twins, and the presence of deformed NiAl precipitates. The dual phase alloy exhibited a more pronounced transformation-induced plasticity effect. At a strain rate of 6000 s⁻¹, the adiabatic temperature rise reached 178 K for the single-phase alloy and 149 K for the dual-phase alloy. These findings indicated that Fe-rich medium-entropy alloys possessed excellent strength and plasticity under high strain rates, ensuring their reliability in dynamic impact environments.

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单相和双相富铁中熵合金的动态压缩行为

研究了不同相结构富铁中熵合金在准静态（10−4 ~ 10−2 s−1）和高应变率（1500 ~ 6000 s−1）条件下的压缩力学行为和变形机理。结果表明：单相Fe57Ni18Cr15Si7Al3和双相Fe62Ni13Cr15Si7Al3合金的压缩试样均未出现断裂或裂纹；在准静态条件下，两种合金均表现出低应变率敏感性，变形主要表现为高密度位错和最小变形孪晶或层错。在高应变速率下，屈服强度显著提高。单相和双相合金的应变率敏感系数（md）分别为0.081和0.089。在单相合金中，变形伴随着高密度位错、变形孪晶和变形NiAl相的存在。双相合金表现出更明显的相变诱导塑性效应。在应变速率为6000 s−1时，单相合金的绝热温升达到178 K，双相合金的绝热温升达到149 K。这些结果表明，富铁中熵合金在高应变率下具有优异的强度和塑性，保证了其在动态冲击环境中的可靠性。

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.