On the Mechanical Property of Al Foil at Higher Temperature

Abstract

The author carried on tension tests of 99.7%Al foils, hard and soft, at various temperatures between room temperature and 600°C and obtained the following results. (1) The tensile strength of hard foils was decreased along a second order curve with the increase of test temperature and at 300∼400° reached the same strength as soft foils, but the elongation did not recover until it recrystallized around 300°C,as given in the previous report. (2) On the other hand, the tensile strength of soft foils was decreased along a straight line with the increase of test temperature. (3) Near the fracture point, it was observed through a microscope that the foil was deformed by slips at lower temperature and mainly by mutual movement of individual crystal grains at higher temperature as in Al plates. (4) Often it was observed that the thinner the foil the more micro-cracks due to various faults of the surface were formed.