Self-lubricating behavior of a PdCuNiP glassy alloy by in-situ nanocrystallization during dry friction
Self-lubricating behavior of a PdCuNiP glassy alloy by in-situ nanocrystallization during dry friction
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DOI：
10.1016/j.jnoncrysol.2023.122485
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发表时间：
2023-09
影响因子：
3.5
通讯作者：
Nengbin Hua;Dehu Geng;Y. Ye;Zhenlong Liao;Qianting Wang;P. Dai;H. Fang;Lei Zhang;P. Liaw
中科院分区：
文献类型：
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作者：
Nengbin Hua;Dehu Geng;Y. Ye;Zhenlong Liao;Qianting Wang;P. Dai;H. Fang;Lei Zhang;P. Liaw
本文研究了PdCuNiP块体非晶合金(BGA)的干滑动行为，并与ZrAlNiCuBGA进行了比较。尽管PdCuNiP BGA具有较小的硬度和断裂韧性，但PdCuNiP BGA的摩擦系数(COF)比ZrAlNiCuBGA小2倍，磨损率低100倍。PdCuNiP BGA的低COF和低磨损率是由于在干滑动过程中在磨痕表面原位形成了非晶态/超细纳米晶结构层。接触区的Von-Mise应力模拟图表明，应力和变形的影响不是纳米晶化的主要原因。该模型计算了摩擦过程中产生的摩擦热，导致原位纳米晶化，提高了表层的硬度和强度。这种自润滑效应是由于有效地抑制了滑动诱发的塑性变形和表面粗糙化。
In the present work, dry-sliding behavior of a PdCuNiP bulk glassy alloy (BGA) was studied and compared with that of a ZrAlNiCu BGA. The PdCuNiP BGA exhibits a 2-fold smaller coefficient of friction (COF) and a 100-fold lower wear rate than those of the ZrAlNiCu BGA, although the PdCuNiP BGA shows the smaller hardness and fracture toughness. The unprecedented low COF and wear rate of the PdCuNiP BGA stem from in-situ formation of an amorphous/ultrafine nanocrystalline structure layer on the wear-scar surface during the dry sliding. The Von-Mises stress simulation mapping in the contact area reveals that the effect of stress and deformation is not the primary cause for the nanocrystallization. The model calculated frictional heat generated during the friction process causes the in-situ nanocrystallization, which increases the hardness and strength of surface layer. The self-lubrication effect results from the effective suppression of the sliding-induced plastic deformation and surface roughening.