The friction behavior of high-purity titanium in microscale was experimentally investigated by using atomic force microscopy to scan two neighboring grains with different crystalline orientations across the grain boundary. The results indicated that there were obvious friction contrast (F_G1/F_G2) between the two neighboring grains. The friction contrast became more obvious when higher normal load was applied, and this trend could be well reproduced by using the DMT model. Based on this, the interfacial shear strength was identified as the main factor causing the friction contrast. Higher scan velocity reduced the friction, which was regarded as the result of the decreased ability to maintain a stable capillary bridge in ambient atmosphere. However, the scan velocity had no significant effect on the friction contrast.

通过使用原子力显微镜扫描晶界上具有不同晶体取向的两个相邻晶粒，在微观尺度上对高纯钛的摩擦行为进行了实验研究。结果表明有明显的摩擦反差（F _G1 / F _G2) 在两个相邻的晶粒之间。当施加较高的法向载荷时，摩擦对比变得更加明显，使用 DMT 模型可以很好地再现这种趋势。基于此，界面剪切强度被确定为导致摩擦对比的主要因素。较高的扫描速度减少了摩擦，这被认为是在环境大气中保持稳定毛细管桥的能力下降的结果。然而，扫描速度对摩擦对比度没有显着影响。