A comparison of the dry sliding wear behavior of NiCoCr medium entropy alloy with 316 stainless steel
A comparison of the dry sliding wear behavior of NiCoCr medium entropy alloy with 316 stainless steel
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DOI：
10.1016/j.matchar.2020.110132
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发表时间：
2020-02
影响因子：
4.7
通讯作者：
Xiao-bin Guo;I. Baker;F. Kennedy;M. Song
中科院分区：
文献类型：
--
作者：
Xiao-bin Guo;I. Baker;F. Kennedy;M. Song
这项工作的目的是确定fcc中熵合金NiCoCr的磨损行为，它已经被其他人证明具有非常好的强度-塑性平衡和特别高的断裂韧性。在空气和氩气中以0.1 m/s的滑动速度对NiCoCr针脚与氧化钇稳定氧化锆片进行干滑动磨损试验。对316不锈钢进行了相同的磨损试验进行比较。结果表明，NiCoCr引脚在空气中的磨损率低于316不锈钢，但在干氩气中两者的磨损率几乎相同。对磨损销的表面和横截面的扫描电镜分析表明，与316不锈钢销相比，NiCoCr销具有更好的韧性，磨损面更平整，断口更少。在空气中进行磨损试验导致氧化物的形成。NiCoCr引脚的x射线光电子能谱分析表明，碎屑中的氧化物为cr2o3和Co2O3。氧化物在NiCoCr引脚尖端形成的机械混合层的发展中起着重要作用，在空气磨损测试中保护接触材料。
The aim of this work was to determine the wear behavior of the f.c.c. medium entropy alloy NiCoCr, which has been shown by others to possess both a very good strength-ductility balance and an especially high fracture toughness. Pins of NiCoCr were tested in dry sliding wear against disks of yttria-stabilized zirconia at a sliding velocity of 0.1 m/s both in air and in argon. Identical wear tests on 316 stainless steel were performed for comparison. It was found that the wear rates of the NiCoCr pins were lower than those of the 316 stainless steel in air, but that the wear rates of the two materials were almost identical in dry argon. Scanning electron microscopy analysis of both the worn pins' surfaces and cross sections indicated that the worn surface of NiCoCr pins were flatter and showed less fracture due to the better toughness compared to the 316 stainless steel pins. Wear tests in air resulted in the formation of oxides. X-ray photoelectron spectroscopy of the NiCoCr pin showed that the oxides in the debris were Cr2O3and Co2O3. The oxides play an important role in the development of a mechanically mixed layer, which formed on the NiCoCr pin's tip to protect the contacting material during wear tests in air.