The single nanoscratch, repeated nanoscratch and double nanoscratch tests of Lu₂O₃ transparent ceramics are carried out on a nanoindenter. Theoretical models of the penetration depth in single scratch, repeated nanoscratch and double nanoscratch tests are established by taking the elastic recovery into account. The surface morphology, friction characteristics of repeated nanoscratch and elastic recovery of double nanoscratch are researched. Ductile surface with hardly cracks and burrs, and obvious pile-up at the leading edge and both sides of the scratch path are obtained. TEM results indicate that the ductile deformation mechanism of Lu₂O₃ transparent ceramics is a combination of poly-crystalline nano-crystallites in the inner grain and amorphous transformation. Many defects including dislocations, stacking faults, nano twins, torsion of atomic plane, fracture of atomic plane and wrong arrangement of atomic plane are induced in nano grains generated during the ductile removal process. The dominant way of subsurface crack propagation is intergranular fracture.

在纳米压头上进行Lu ₂ O ₃透明陶瓷的单纳米划痕，重复纳米划痕和双纳米划痕测试。通过考虑弹性回复，建立了单划痕，重复纳米划痕和双纳米划痕试验中的渗透深度的理论模型。研究了表面形貌，重复纳米刮擦的摩擦特性和双纳米刮擦的弹性回复率。获得了几乎没有裂纹和毛刺的延展性表面，并且在刮擦路径的前缘和两侧均出现了明显的堆积。TEM结果表明，Lu ₂ O ₃的塑性变形机制透明陶瓷是内部晶粒中的多晶纳米晶体与无定形转变的结合体。在球墨铸铁去除过程中产生的纳米晶粒中会引起许多缺陷，包括位错，堆垛层错，纳米孪晶，原子平面扭曲，原子平面破裂和原子平面排列错误。地下裂纹扩展的主要方式是晶间断裂。