Research on Coarse Grain of 3003-H14 Aluminium Alloy Sheet for Battery Shell
By means of optical micrograph(OM),scanning electron micrograph(SEM)and electron back scatter diffraction(EBSD),the coarse grain on the surface of 3003-H14 aluminium alloy sheet was studied.It is found that the coarse grain phenomenon mainly oc-curs on the surface of the sheet,the depth of the coarse grain layer is about 150 μm,and the grain size is more than 1 mm.Compared with the normal grain size samples,the coarse grain samples have a lower proportion of α-AlFeMnSi compounds,more submicron scale AlMnSi precipitates,larger compound size and more uneven compound size distribution.Through literature research,process in-formation review and the repetition of homogenization in small furnace,the analysis shows that insufficient homogenization strength leads to excessive precipitation of submicron scale AlMnSi phase,which hinders the nucleation of the recrystallization and leads to the coarse grain.After controlling and adjusting the homogenizing heat treatment process,the coarse grain problem was solved.
3003 aluminium sheet for battery shellhomogenizing heat treatmentrecrystallizationAlMnSi precipitates
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