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"Quantifying geometrically necessary dislocation with surface roughness" by Weng Mei Kok, Hun Guan Chuah et al.

The present study investigated the geometrically necessary dislocation (GND) with the influence of the surface roughness by establishing the relation of roughness in GND for indentation. The single crystal copper with (111) oriented surface plane was chosen and polished to various roughness levels ranging from 32.7 to 224 nm and subjected to indentation. The increase in surface roughness revealed to increase in the GND and statistically stored dislocation density. As the indentation force decrease from 9.8 to 0.245 N, the plastic strain gradient related to GND increase from 0.0001 up to 0.0017 µm−1 for each 1 nm increment of surface roughness. ....

Copper 111 , Eometrically Necessary Dislocation , Lastic Strain Gradient , Size Effect , Tatistically Stored Dislocation , Surface Roughness ,

"A method for the determination of individual phase properties in multi" by Tao Zhang, Haibo Xie et al.

A method is proposed to determine the accurate constitutive model of individual phase in multiphase steel with small phase size. The nanoindentation tests with continuous stiffness method (CSM) were implemented to obtain the hardness-displacement curves of the advanced high strength steel DP1180. The validity of the nanoindentation results was evaluated based on the EBSD results and classic indentation size effect (ISE) model. The extra loading of loading-displacement curves due to geometrically necessary dislocations (GNDs) was excluded based on the simple established model. The constitutive model of each phase was determined based on the corrected loading-displacement curves using the inversion method. The results of microstructure based simulation agree well with those of tensile tests, which proves the reliability and accuracy of the constitutive model of individual phase obtained from the method proposed in this study. ....

Constitutive Model , Eometrically Necessary Dislocation , Ultiphase Steel ,