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Effect of preform annealing on plastic anisotropy of an age-hardenable Al-Mg-Si alloy.
- Source :
-
Journal of Materials Processing Technology . Feb2018, Vol. 252, p381-388. 8p. - Publication Year :
- 2018
-
Abstract
- Plastic anisotropy as characterized by the Lankford parameter ( r -value), which relates to the resistance to thinning (or deep drawability) in sheet metal forming, has been investigated for an age-hardenable Al-Mg-Si alloy under different preforming and annealing conditions. Digital image correlation analysis was applied to measure r -value accurately during tensile testing as a function of effective plastic strain. X-ray diffraction techniques were used to determine the sheet texture in order to explain the changes in r -value. It was found that r -value is not constant during this two-stage forming process, but rather depends on pre-strain path and level. Rapid annealing at high temperature without pre-straining the as-received material had little influence on r -value, whereas the application of prestrain with annealing did cause significant changes in r -value that can be explained by changes in texture. Four crystal orientations were observed in the sheet texture, i.e. the cube orientation {001}〈100〉, the S orientation {123}〈634〉, the P orientation {011}〈122〉, and the C orientation {112}〈111〉; and the changes of r -value are assessed by the relative proportion of these texture components. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ANNEALING of metals
*SHEET metal
*ALUMINUM
*METAL formability
*ALLOYS
Subjects
Details
- Language :
- English
- ISSN :
- 09240136
- Volume :
- 252
- Database :
- Academic Search Index
- Journal :
- Journal of Materials Processing Technology
- Publication Type :
- Academic Journal
- Accession number :
- 126185706
- Full Text :
- https://doi.org/10.1016/j.jmatprotec.2017.09.043