Title

Molecular dynamic simulation of effect of crystallographic orientation on nano-indentation/scratching behaviors of BCC iron

RIS ID

40691

Publication Details

Lu, C., Gao, Y., Michal, G., Zhu, H., Huynh, N. N. Tieu, A. K. (2009). Molecular dynamic simulation of effect of crystallographic orientation on nano-indentation/scratching behaviors of BCC iron. 5th China International Symposium on Tribology/1st International Tribology Symposium of IFToMM (pp. 562-563). TSINGHUA UNIVERSITY PRESS.

Abstract

"A molecular dynamics model has been developed to investigate the effect of the crystallographic orientation on the material deformation behaviors in nano- indentation/scratching of BCC iron. Two cases with different substrate orientations have been simulated. The orientations along x, y and z direction are [001], [100] and [010] for Case I and [111], [-1-12] and [1-10] for Case II, respectively. Case I and Case II exhibit different deformation patterns in the substrate. During indentation, the pile-up can be observed in Case I, but not in Case II. During scratching the pile-up ahead of the movement of the indenter has been enlarged in Case I, while a chip with the disordered atoms is generated in Case II. It has been found that Case I has both higher hardness and larger coefficient of friction. The ratios of the hardness and the coefficient of friction between cases I and II are nearly 2. The reason is attributed to the different crystallographic orientations used in both cases."

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