<br>Al含量对AlxCr0.2NbTiV难熔高熵合金组织与性能的影响,Entropy

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Al含量对AlxCr0.2NbTiV难熔高熵合金组织与性能的影响
Entropy ( IF 2.1 ) Pub Date : 2024-05-21 , DOI: 10.3390/e26060435
Rongbin Li _{1,

2} , Qianqian Li ₂ , Zhixi Zhang ₁ , Rulin Zhang ₁ , Yue Xing ₂ , Doudou Han ₁

Affiliation

高温蠕变是指材料在长时间的高温和机械应力的作用下缓慢而连续的塑性变形，这可能导致部件功能退化甚至失效。 AlxCr0.2NbTiV（x = 0.2、0.5 或 0.8）难熔高熵合金采用电弧熔炼方法制备。利用X射线衍射、扫描电子显微镜和电子背散射衍射研究了Al含量对AlxCr0.2NbTiV合金显微组织的影响。还测试了AlxCr0.2NbTiV合金的显微硬度、压缩性能和纳米压痕蠕变性能。结果表明AlxCr0.2NbTiV系列呈现BCC单相结构。随着Al含量的增加，合金的晶格常数逐渐降低，(110)晶面衍射峰强度增大。添加铝增强固溶强化效果；然而，由于晶粒粗化，合金的显微硬度和室温压缩强度仅略有提高。此外，由于固溶强化的效果在高温下减弱，合金在1000℃时的抗压强度显着降低。合金的蠕变机制主要受位错蠕变控制。此外，增加Al含量有助于降低合金在蠕变过程中对加载速率的敏感性。在2.5 mN/s的加载速率下，Al0.8Cr0.2NbTiV合金表现出最低的蠕变应变速率敏感性指数（m），为0.0758。

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Effect of Al Content on Microstructure and Properties of AlxCr0.2NbTiV Refractory High-Entropy Alloys

High-temperature creep refers to the slow and continuous plastic deformation of materials under the effects of high temperatures and mechanical stress over extended periods, which can lead to the degradation or even failure of the components’ functionality. AlxCr0.2NbTiV (x = 0.2, 0.5, or 0.8) refractory high-entropy alloys were fabricated by arc melting. The effects of Al content on the microstructure of AlxCr0.2NbTiV alloys were studied using X-ray diffraction, scanning electron microscopy, and electron backscatter diffraction. The microhardness, compression properties, and nanoindentation creep properties of AlxCr0.2NbTiV alloys were also tested. The results show that the AlxCr0.2NbTiV series exhibits a BCC single-phase structure. As the Al content increases, the lattice constant of the alloys gradually decreases, and the intensity of the (110) crystal plane diffraction peak increases. Adding aluminum enhances the effect of solution strengthening; however, due to grain coarsening, the microhardness and room temperature compressive strength of the alloy are only slightly improved. Additionally, because the effect of solution strengthening is diminished at high temperatures, the compressive strength of the alloy at 1000 °C is significantly reduced. The creep mechanism of the alloys is predominantly governed by dislocation creep. Moreover, increasing the Al content helps to reduce the sensitivity of the alloy to the loading rate during the creep process. At a loading rate of 2.5 mN/s, the Al0.8Cr0.2NbTiV alloy exhibits the lowest creep strain rate sensitivity index (m), which is 0.0758.

更新日期：2024-05-21

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