Electrodeposited metallic glasses with superlative wear resistance
Electrodeposited metallic glasses with superlative wear resistance
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DOI：
10.1016/j.msea.2021.141315
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发表时间：
2021-04
期刊：
影响因子：
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通讯作者：
M. Pole;Maryam Sadeghilaridjani;J. Shittu;Chaitanya G Mahajan;Nandita Ghodki;S. Mukherjee
中科院分区：
文献类型：
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作者：
M. Pole;Maryam Sadeghilaridjani;J. Shittu;Chaitanya G Mahajan;Nandita Ghodki;S. Mukherjee
电沉积路线，以获得非晶合金提供了一个方便，低成本，和通用的替代传统的熔体淬火。然而，对于电沉积金属玻璃（EMG）的摩擦学性能和磨损机制还存在显着的知识差距。本文研究了一种二元非晶合金模型的磨损行为和划痕响应。系统地研究了电沉积Ni-P非晶合金的组成与非晶合金形成的关系，在磷含量为10at%~ 20at%的较窄范围内，非晶合金的形成与非晶合金的形成有关。电沉积的金属玻璃显示出在6.6- 7.4GPa范围内的硬度值，在155-163 GPa范围内的模量，和约0.50的摩擦系数。在所研究的合金中，电沉积Ni 80 P20显示出最低的磨损率，比电沉积纯Ni低两个数量级。磨损机制被确定为广泛的塑性变形沿着与轻度犁削，微撕裂，并形成不连续的润滑氧化物补丁。划痕试验表明，随着磷含量的增加，非晶合金的损伤起始临界载荷增加，其趋势为：Ni 80 P20> Ni 85 P15> Ni 90 P10。发现电沉积金属玻璃的总体磨损率低于大多数报告的大块金属玻璃（BMG）。这代表了电沉积金属玻璃的结构-性能相关性的基础研究，并展示了电沉积在调节非晶合金表面性能方面的多功能性。
The electrodeposition route to obtain amorphous alloys offers a facile, low-cost, and versatile alternative to conventional melt quenching. However, there are significant knowledge gaps in tribological properties and wear mechanisms for electrodeposited metallic glasses (EMGs). Here, the wear behavior and the scratch response of a model binary amorphous alloy system were investigated. Electrodeposited Ni–P metallic glasses were systematically studied as a function of composition, with amorphous alloy formation over the narrow range of 10 at% to 20 at% phosphorus. The electrodeposited metallic glasses showed hardness values in the range of 6.6–7.4 GPa, modulus in the range of 155–163 GPa, and friction coefficient around 0.50. Among the studied alloys, electrodeposited Ni80P20showed the lowest wear rate, which was two orders of magnitude lower than electrodeposited pure Ni. The wear mechanism was determined to be extensive plastic deformation along with mild ploughing, micro tears, and formation of discontinuous lubricious oxide patches. Scratch tests showed an increase in critical load for damage initiation with the increase in phosphorus content among the amorphous alloys following the trend: Ni80P20> Ni85P15> Ni90P10. The overall wear rate for the electrodeposited metallic glasses was found to be lower than most reported bulk metallic glasses (BMGs). This represents a fundamental study on structure-property correlations in electrodeposited metallic glasses and demonstrates the versatility of electrodeposition in tuning the surface properties of amorphous alloys.