Abstract High-entropy alloys (HEAs) with a single-phase face-centered cubic (FCC) structure generally have excellent plasticity. However, its limited room temperature strength and hardness result in lower wear resistance, which hinders tribological and engineering applications. In this paper, the pack-boronizing method was used to improve the tribological properties of Al0·1CoCrFeNi HEAs with a single-phase FCC structure. The boronizing treatment was carried out at 900 °C for 2, 4, 6, and 8 h, respectively. The structure and phase formation of boronized alloys were studied. Moreover, the reciprocating sliding wear behavior of boronized alloys against Si3N4 balls in dry and deionized water was investigated. A boronized layer with a double-layer structure was formed on the HEA surface, with a total thickness of about 17.3–58.5 μm. The wear mechanism of boronized alloy was transformed from the abrasive and delamination wear to the polishing effect with increasing the boronizing time in air. In contrast, the wear mechanism of boronized alloys in the deionized water gradually changed from the two-body to three-body wear with increasing the boronizing time. Meanwhile, the wear mechanism of the Si3N4 counterface was also transformed to three-body wear gradually.

中文翻译：

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硼化Al0.1CoCrFeNi高熵合金在干燥和润滑条件下的摩擦学行为

摘要 具有单相面心立方（FCC）结构的高熵合金（HEAs）通常具有优异的塑性。然而，其有限的室温强度和硬度导致耐磨性较低，阻碍了摩擦学和工程应用。本文采用堆硼化方法改善具有单相FCC结构的Al0·1CoCrFeNi HEAs的摩擦学性能。渗硼处理分别在 900 ℃下进行 2、4、6 和 8 小时。研究了渗硼合金的结构和相形成。此外，研究了硼化合金在干燥和去离子水中对 Si3N4 球的往复滑动磨损行为。HEA表面形成双层结构的硼化层，总厚度约为17.3-58.5μm。随着空气中渗硼时间的增加，渗硼合金的磨损机制由磨粒和分层磨损转变为抛光作用。相反，随着渗硼时间的增加，渗硼合金在去离子水中的磨损机制逐渐从二体磨损转变为三体磨损。同时，Si3N4配合面的磨损机制也逐渐向三体磨损转变。