Effect of intermediate annealing on texture evolution and plastic anisotropy in an Al-Mg autobody alloy

Abstract

The effect of intermediate annealing (IA) on texture evolution and plastic anisotropy of an Al-Mg autobody sheet was investigated. The formation of annealing textures after two kinds of final heat treatments was discussed with the aid of microstructural characterization. The results showed that the IA treatment had obvious influences on the final annealing texture as well as the resulting plastic anisotropy. It led to relatively lower recrystallization extent and stronger retained rolling orientations in the sheets after final heat treatment. The final annealing textures were very weak due to the dominant influence of particle stimulated nucleation. The other orientations occurring can either be attributed to genuine recrystallization or to recrystallization in situ. As a result of good suppression of the cube and rotated cube orientations, a good combination of normal anisotropy and planar anisotropy was achieved in the sample with IA and after O treatment.

Effect of specimen geometry, gage length, and width measurement locations on plastic strain ratio (R-value) in sheet metals

“…The R-value of IF steel sheet is reported to be the highest in the transverse direction, [8,13] and thus, IF steel specimens were prepared along the transverse direction. The obtained stress-strain curves for IF and AA8011 specimens are shown in Figure 1.…”

“…These differences suggest that universal agreement on the measurement of strain ratio is not easily reached. [1] In pursuing a reliable technique for precise determination of R-value, several authors have studied the effect of various factors, such as elastic strains, [2] specimen type, [3][4][5][6] locations along the gage length for strain measurements, [1,4,[6][7][8][9][10] angle between the tensile test axis and the rolling direction of the sheet, [11,12,13] and the amount of straining in the tension test. [14][15][16][17][18][19][20] Rao and Mohan [5] studied the effect of specimen geometry on the mechanical properties of commercial brass sheets and concluded that anisotropy values are similar in all ASTM E 8M-93 and 517 to 92a type A (dog-bone shaped) and type B (parallel strips) specimens.…”

Texture‐Induced Anisotropy in Asymmetrically Rolled Aluminium Alloys

“…This type of anisotropy is normally observed in conventionally produced aluminium alloys. [3,10] The asymmetry of the r-profile is related to the presence of the Goss and the P component. Crystal plasticity calculations with the visco plastic self-consistent model [11] allow investigation of the effect of texture on plastic anisotropy.…”

“…[8][9][10] IA prior to the last cold rolling step, leads to a weaker b-fibre in the rolled material as compared to the case without IA. [14] Because of a complex interaction between the different precipitation sequences and the recrystallization, the intermediate annealing (IA) steps added to the cold rolling sequence changes the final RX texture significantly.…”

A study of mechanical isotropy of continuous cast and direct chill cast AA5182 Al alloys

“…It is well recognized that the microstructure and texture of the Al alloy hot band are determined by the rolling temperature, strain, strain rate and composition [12][13][14]. The mechanical properties, anisotropy and formability are closely associated with the microstructure and texture of Al alloys [15][16][17][18][19][20][21][22][23][24]. The prior microstructure and texture affect the microstructure and texture in an Al alloy during the subsequent thermomechanical processing.…”