Author:

Keywords:

roping, ridging, crystal plasticity, Al alloys, texture, r-value, EBSD, moving window

Abstract:

Aluminium alloys for automobile body panel application often show a specific type of band-shaped surface roughening upon stretching, called “ridging” or “roping”. Extensive research has indicated that the evolving surface roughness profiles are related to surface texture patterning. This work presents a “Moving window” method for detecting such texture patterning based on EBSD orientation maps. The measured EBSD map can be subdivided by the moving window, within which the orientation information is selected to represent the local texture. Then, the full constraint Taylor crystal plasticity model is used to simulate the Lankford coefficient (also called r-value) based on texture. By varying the size of the moving window in the transverse direction, the texture patterning in terms of the Lankford coefficient can be studied. Two samples with different roping tendency are studied in this work.