Microstructure, mechanical properties, Electrical resistivity, and corrosion behavior of (AlCr)x(HfMoNbZr)1-x films
Microstructure, mechanical properties, Electrical resistivity, and corrosion behavior of (AlCr)x(HfMoNbZr)1-x films
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DOI：
10.1016/j.apsusc.2023.157368
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发表时间：
2023-04
影响因子：
6.7
通讯作者：
Jianjun Kang;Hao Liu;H. Du;Jie Shi;Linlin Wang;Liuquan Yang;Houfu Dai
中科院分区：
文献类型：
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作者：
Jianjun Kang;Hao Liu;H. Du;Jie Shi;Linlin Wang;Liuquan Yang;Houfu Dai
难熔高熵合金（RHEAs）由于其优异的性能（如高强度、高温稳定性和耐腐蚀潜力）而成为一类新的材料。在这项研究中，我们研究了Al和Cr共合金化对HfMoNbZr薄膜的晶体结构，力学性能，电阻率和耐腐蚀性的影响。采用直流磁控溅射法，用Al 50 Cr 50和Hf 25 Mo 25 Nb 25 Zr 25靶共溅射制备了（AlCr）x（HfMoNbZr）1-x薄膜。我们的研究结果表明，所有的薄膜具有B2型BCC细晶粒微晶结构。密度泛函理论（DFT）计算结果表明，AlCr含量的增加导致合金硬度和电阻率的增加，这可能是由于Al原子产生的定向角键和晶格畸变所致。此外，（AlCr）x（HfMoNbZr）1-x膜在3.5wt% NaCl溶液中表现出优异的耐腐蚀性，如低于10−8A/cm 2的腐蚀电流所示。当PAlCr = 90 W时，电流密度达到最小值4.85 ± 0.43 × 10-9A/cm 2。这些结果表明，通过元素合金化的RHEAs的可调性能，这为各种应用提供了有前途的机会。
Refractory high-entropy alloys (RHEAs) have emerged as a new class of materials due to their exceptional properties such as high strength, high-temperature stability, and potential for corrosion resistance. In this study, we investigate the effect of Al and Cr co-alloying on the crystal structure, mechanical properties, electrical resistivity, and corrosion resistance of HfMoNbZr film. (AlCr)x(HfMoNbZr)1-xfilms were grown using direct current magnetron sputtering, with Al50Cr50and Hf25Mo25Nb25Zr25target co-sputtering. Our findings reveal that all films possess a B2-type BCC fine-grained crystallite structure. Moreover, an increase in AlCr content results in an increase in hardness and electrical resistivity, which can be attributed to the stronger directionally angular bonds and higher local lattice distortion caused by Al atoms, as confirmed by density functional theory (DFT) calculations. Additionally, the (AlCr)x(HfMoNbZr)1-xfilms exhibit excellent corrosion resistance in 3.5 wt% NaCl solution, as indicated by a corrosion current below 10−8A/cm2. Remarkably, atPAlCr= 90 W, the current density reaches a minimum value of 4.85 ± 0.43 × 10-9A/cm2. These results demonstrate the tunable properties of RHEAs through element alloying, which offers promising opportunities for various applications.