A comparison of the dry sliding wear of single-phase f.c.c. carbon-doped Fe40.4Ni11.3Mn34.8Al7.5Cr6 and CoCrFeMnNi high entropy alloys with 316 stainless steel
A comparison of the dry sliding wear of single-phase f.c.c. carbon-doped Fe40.4Ni11.3Mn34.8Al7.5Cr6 and CoCrFeMnNi high entropy alloys with 316 stainless steel
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DOI：
10.1016/j.matchar.2020.110693
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发表时间：
2020-12
影响因子：
4.7
通讯作者：
Xiao-bin Guo;Xiao-bin Guo;I. Baker;F. Kennedy;S. Ringer;Hansheng Chen;Weidong Zhang;Yong Liu-
中科院分区：
文献类型：
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作者：
Xiao-bin Guo;Xiao-bin Guo;I. Baker;F. Kennedy;S. Ringer;Hansheng Chen;Weidong Zhang;Yong Liu-
在环境条件下测定了面心立方（f.c.c.）高熵合金掺碳Fe40.4Ni11.3Mn34.8Al7.5Cr6和等原子CoCrFeMnNi的干滑动磨损行为，并与316不锈钢在两种滑动速度下和在氩气中慢滑动速度下的干滑动磨损行为进行了比较。采用扫描电子显微镜、能量色散X射线能谱、电子背散射衍射、X射线光电子能谱和原子探针断层扫描分析来表征磨损的微观结构。结果发现，在空气中，以 0.1 m/s 的慢滑动速度，掺碳 FeNiMnAlCr 与 316 不锈钢 (2.9 × 10−4mm3/N/m) 或 CoCrFeMnNi (3.4 × 10−4mm3/N/m) 相比，磨损率低得多，为 3.0 × 10−5mm3/N/m。相比之下，在氩气中以这种慢滑动速度和在空气中以 1.0 m/s 的高滑动速度，所有三种材料都表现出类似的磨损率，分别为 ~ (2.4 ± 0.6) × 10−5mm3/N/m 和 ~ (1.2 ± 0.3) × 10−5mm3/N/m，这表明环境和针尖温度对磨损率的强烈影响。研究发现，在掺碳 FeNiMnAlCr 合金上形成的氧化物比在 CoCrFeMnNi 或 316 不锈钢上形成的氧化物更稳定、更耐用，并且掺碳 FeNiMnAlCr 的磨损碎片具有最小的直径 (3 µm) 和最低的氧含量（39 at）。 %。碳掺杂 FeNiMnAlCr 磨损表面上较多的 Al2O3 和较少的 Fe2O3、MnOx 或 Cr2O3 导致了剥落或分层形貌，氧含量高达 46 at。与 316 不锈钢和 CoCrFeMnNi 的磨损表面相比，这两种材料都表现出带有横向裂纹的凹槽磨损表面和 7.5 at 的较低氧含量。 % 和 31 at。 ％， 分别。较硬的 Al2O3 氧化膜在磨损测试过程中稳定且粘附，有助于保护磨损的销尖，这是 C 掺杂 FeNiMnAlCr 耐磨性增强的原因。 316不锈钢的磨损保护机制归因于硬质机械变形层，而CoCrFeMnNi缺乏氧化膜或硬变形层的保护。
The dry sliding wear behaviors of the face-centred cubic (f.c.c.) high entropy alloys carbon-doped Fe40.4Ni11.3Mn34.8Al7.5Cr6and equiatomic CoCrFeMnNi were determined under ambient conditions and compared with that of 316 stainless steel at two sliding velocities and in argon at a slow sliding velocity. Scanning electron microscopy, energy dispersive X-ray spectrometry, electron backscattered diffraction, X-ray photoelectron spectroscopy, and atom probe tomography analyses were employed to characterize the worn microstructures. It was found that in air at the slow sliding velocity of 0.1 m/s C-doped FeNiMnAlCr exhibited a much lower wear rate of 3.0 × 10−5mm3/N/m compared to either 316 stainless steel (2.9 × 10−4mm3/N/m) or CoCrFeMnNi (3.4 × 10−4mm3/N/m). In contrast, both in argon at this slow sliding velocity and in air at the high sliding velocity of 1.0 m/s, all three material showed similar wear rates of ~ (2.4 ± 0.6) × 10−5mm3/N/m and ~ (1.2 ± 0.3) × 10−5mm3/N/m, respectively, indicating the strong effect of the environment and pin tip temperature on the wear rates. The oxide that formed on the C-doped FeNiMnAlCr alloy was found to be more stable and durable than that on either the CoCrFeMnNi or on the 316 stainless steel, and the wear debris from C-doped FeNiMnAlCr had the smallest diameter (3 μm) and the lowest oxygen content of 39 at. %. Greater Al2O3and less Fe2O3, MnOxor Cr2O3on the worn surface of C-doped FeNiMnAlCr contributed to a peeled-off or delaminated morphology with a higher oxygen content of 46 at. % compared to the worn surfaces of the 316 stainless steel and the CoCrFeMnNi, which both exhibited grooved worn surfaces with lateral cracks and lower oxygen contents of 7.5 at. % and 31 at. %, respectively. The harder Al2O3oxide film was stable and adherent during wear testing and helped protect the worn pin's tip, which was the reason for the increased wear resistance of the C-doped FeNiMnAlCr. The wear protection mechanism of 316 stainless steel was attributed to a hard mechanically deformed layer, while the CoCrFeMnNi lacked protection from either the oxide film or a hard deformed layer.