Microtexture based analysis of surface asperity flattening behavior of annealed aluminum alloy in uniaxial planar compression

Abstract

X. (2013). Microtexture based analysis of surface asperity flattening behavior of annealed aluminum alloy in uniaxial planar compression. Tribology International, Microtexture based analysis of surface asperity flattening behavior of annealed aluminum alloy in uniaxial planar compression AbstractDuring the uniaxial planar compression of annealed aluminum alloy, a novel approach to determine surface asperity flattening (roughness Ra) is employed by analyzing the evolution of surface microtexture. With an increase in gauged reduction, surface asperity tends to be flattened, and strain hardening increases. Lubrication can constrain the surface asperity flattening process. Development of surface asperity features shows the obvious dependency on [111] orientation. In-grain slips contribute significantly to the evolution of surface microtexture. Influence of deformation twins (brass orientation) on the evolution of microtexture is not obvious under our current experimental conditions. on the evolution of microtexture is not obvious under our current experimental conditions.

Surface asperity evolution and microstructure analysis of Al 6061T5 alloy in a quasi-static cold uniaxial planar compression (CUPC)

“…1), aluminum alloy 6061 samples were compressed on a channel die [19,21], while samples were constrained in the transverse direction. In order to reduce the influence of tool, the compressing tool is polished smoothly (roughness is about 10 nm) and flat.…”

“…So the surface roughness evolution in most constrained deformation is really a surface asperity flattening process [17]. In recent years, Li et al [18][19][20][21][22][23] employed crystal plasticity theory to develop a 3D surface asperity flattening model to simulate the practical constrained deformation process, analyzed the relationship between the surface asperity and reduction, friction and texture. It was found that during the normal CUPC process surface roughness evolution of workpiece is proportional to gauged reduction, friction plays an important role in surface asperity flattening by decreasing the surface roughness and increasing micro hardness and flow stress.…”

Application of Finite Element Analysis in Multiscale Metal Forming Process

“…There are different stages in the evolution of hardness because when the reduction is lower (less than 60%), increasing the strain rate generally increases the hardness. At a larger reduction, increasing the strain rate will decrease the hardness under the same reduction [23]. When the reduction is lower, increasing the strain rate can increase the shearing rate of slip systems and also increase the density of dislocation.…”

Study on Surface Asperity Flattening in Cold Quasi-Static Uniaxial Planar Compression by Crystal Plasticity Finite Element Method

“…In this case the strain rate is very low and the deformation is a quasi-static process, therefore the strain rate can be considered as a constant. In this study, the displacement rate is used to replace the strain rate [17][18][19][20][21]. The relationship between the strain rate and displacement rate is…”

“…From the previous research [18][19][20][21], it is obvious that the lubrication can play an obvious role in hindering the surface asperity flattening. If the surface asperity flattening takes place at quasi-static (very low strain rate) process, the influence of lubrication is similar.…”