Photoacoustic thermoelastic effect near Vickers indentations in nanocrystalline

2020-03-03 04:16:34

magnetic force Microscope recording Japan

责任者: Muratikov, K.L.;Glazov, A.L.;Nikolaev, V.I. 单位: Ioffe Physiocotech. Inst., Russian Acad. of Sci., St. Petersburg, Russia 来源出处: Technical Physics Letters(Tech. Phys. Lett. (Russia)),,():685-7 摘要: The character of the photoacoustic (PA) signal variations in the vicinity of Vickers indentation zones in nanocrystalline nickel has been studied. PA images revealing the response signal features inside and outside these zones have been obtained. The character of the PA signal variation is compared to that predicted by the existing model relating the PA response to stress-induced changes in the thermoelastic coupling coefficient of the material. It is shown that the existing model adequately describes the observed character of internal stress variations near the indentations sites only in the absence of additional stresses related to the sample preparation technology 关键词: indentation;internal stresses;nanostructured materials;nickel;photoacoustic effect;thermoelasticity;photoacoustic thermoelastic effect;Vickers indentations;nanocrystalline nickel;photoacoustic signal variations;thermoelastic coupling coefficient;internal stress;Ni