An investigation of the onset of elastoplastic deformation during nanoindentation in MgO single crystal (001) and (110) planes

作者：Dong, Zhigang; Huang, Han^*; Kang, Renke

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2010, 527(16-17): 4177-4184.

DOI：10.1016/j.msea.2010.03.037

• MgO
• Nanoindentation
• Pop-in
• Deformation
• Shear stress
• Acoustic emission

Nanoindentation was performed in the (0 0 1) and (1 1 0) planes of magnesium oxide single crystal. The results showed that pop-in events were observed in both cases, which were accompanied by acoustic emissions. The energy released in a pop-in event was related to the acoustic emission energy. The pop-in indicated the onset of plastic deformation. Using the Hertzian contact theory and the measured pop-in load, the critical shear stresses for slipping on the (0 0 1) and (1 10) planes were estimated. The stress value for the (0 0 1) plane was about 17% higher than that of the (1 1 0) plane.

• 出版日期2010-6-25
• 单位大连理工大学