Dingshan Liang , Chengxia Wei , Zongyuan Li , Qiming Zhuang, Lu Yang, Chen Wu, Fuzeng Ren
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引用次数: 0
摘要
面心立方(FCC)成分复杂合金(CCA)因其优异的机械性能而广受认可,使其有望应用于要求苛刻的工程领域。然而,这些合金面临的一个重大挑战是其有限的耐磨性。在本研究中,我们通过在等原子 FCC CrFeNi 合金中引入 5 at.% Nb 来解决这一问题,从而创建了拉维斯相强化 CrFeNiNb 合金,并研究了其在室温和高温下的滑动磨损行为。我们的研究结果表明,拉维斯相强化铬铁镍铌合金的磨损性能得到了大幅改善。具体来说,与铬镍铁合金相比,该合金在室温(RT)下的磨损率显著降低了 62%。此外,在 600 °C 的高温下,磨损率降低了约 95%,这主要归功于润滑性(Cr, Fe)O 氧化层的形成。通过详细分析,我们确定了磨损模式,即在实时温度下的磨料磨损和在高温下的氧化磨损。这些结果为设计耐磨的催化裂化碳酸钙提供了宝贵的启示,即利用拉维斯相强化和加入易氧化的元素来促进高温下保护性氧化层的形成。
Sliding wear behavior of a Laves phase-strengthened CrFeNiNb0.158 alloy at room and elevated temperatures
Face-centered-cubic (FCC) compositionally complex alloys (CCAs) are recognized for their exceptional mechanical properties, rendering them promising candidates for demanding engineering applications. However, a significant challenge faced by these alloys is their limited wear resistance. In this study, we addressed this issue by introducing 5 at.% Nb into an equiatomic FCC CrFeNi alloy, thereby creating a Laves phase-strengthened CrFeNiNb0.158 alloy, and investigated its sliding wear behavior at both room and elevated temperatures. Our findings reveal a substantial improvement in the wear performance of the Laves phase-strengthened CrFeNiNb0.158 alloy. Specifically, at room temperature (RT), the alloy exhibited a remarkable 62 % reduction in wear rate compared to the CrFeNi alloy. Furthermore, at an elevated temperature of 600 °C, the wear rate decreased by approximately 95 %, primarily attributed to the formation of a lubricating (Cr, Fe)2O3 oxide layer. Through detailed analysis, we identified the wear modes as abrasive wear at RT and oxidative wear at elevated temperatures. These results provide valuable insights for designing wear-resistant FCC CCAs by utilizing Laves phase strengthening and incorporating elements prone to oxidation to facilitate the formation of a protective oxide layer at elevated temperatures.
期刊介绍:
Wear journal is dedicated to the advancement of basic and applied knowledge concerning the nature of wear of materials. Broadly, topics of interest range from development of fundamental understanding of the mechanisms of wear to innovative solutions to practical engineering problems. Authors of experimental studies are expected to comment on the repeatability of the data, and whenever possible, conduct multiple measurements under similar testing conditions. Further, Wear embraces the highest standards of professional ethics, and the detection of matching content, either in written or graphical form, from other publications by the current authors or by others, may result in rejection.