In-situ observation and formation mechanism of aluminum voiding

Abstract

An in situ observation equipment was used to investigate aluminum void formation. It was found that the voids are formed during heating and are hardly changed during cooling. The void growth can be described by an equation in which the total number of voids saturates to a certain value as a function of heating time. The passivation swelling as a causative mechanism was confirmed with an actual trace of the material's surface and by a finite-element simulation.<>