Surface flow in severe plastic deformation of metals by sliding

6th International Conference on Nanomaterials by Severe Plastic Deformation

材料科学;化学

Mahato, A.^1 ; Guo, Y.^2 ; Yeung, H.^1 ; Chandrasekar, S.^1

Center for Materials Processing and Tribology, Purdue University, West Lafayette, IN 47907, United States^1

M4 Sciences LLC, West Lafayette, IN 47906, United States^2

关键词: High speed imaging;    Metal surfaces;    Particle generation;    Severe plastic deformations;    Surface conditioning;    Surface deformation;    Surface folding;    Vortex formation;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/63/1/012016/pdf
DOI  :  10.1088/1757-899X/63/1/012016

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

An in situ study of flow in severe plastic deformation (SPD) of surfaces by sliding is described. The model system-A hard wedge sliding against a metal surface-is representative of surface conditioning processes typical of manufacturing, and sliding wear. By combining high speed imaging and image analysis, important characteristics of unconstrained plastic flow inherent to this system are highlighted. These characteristics include development of large plastic strains on the surface and in the subsurface by laminar type flow, unusual fluid-like flow with vortex formation and surface folding, and defect and particle generation. Preferred conditions, as well as undesirable regimes, for surface SPD are demarcated. Implications for surface conditioning in manufacturing, modeling of surface deformation and wear are discussed.