With the augmentation of grain size, surface defects of the manganese zinc ferrite nanocrystallines minish, and intergranular free volume combines. 随着粒径的增大，纳米晶的表面缺陷减小，晶界间的自由体积发生复合。
Cracks leading to spalling were initiated at surface defects and boundaries between nitriding layes and the core. 导致剥落的疲劳裂纹开始于表面缺陷和氮化层与心部交界处。
