The effects of Si

Mn and Fe elements alloying on the high temperature properties and microstructure of ultrathin aluminum alloy fins were investiagted by high temperature tensile test

optical microscope and scanning electron microscope.The results reveal that the strength of 3003 and 3003 mod aluminum alloy is decreased with the increase of tensile temperature

while the elongation is increased firstly and then decreased.The yield strength of alloy-modified ultrathin 3003 mod at 500 ℃is 32.2% higher than that of 3003 alloy.The number of nanoscale particles in 3003 mod aluminum alloy is increased significantly with alloying

and the micronscale particle number is reduced.The characteristic of microstructure of 3003 mod alloy can suppress secondary recrystallization nucleation of the ultrathin foil in the process of high temperature tensile

leading to more coarse grain and bigger aspect ratio compared with the 3003 alloy at the same tensile temperature.The secondary recrystallization is mainly respeosnible for the sharp decrease of the elongation of the two alloys compared with that at 300℃.