5000系アルミニウム合金板の機械的特性と角筒深絞り成形性の温度，ひずみ速度依存性

Abstract

Uniaxial tensile tests, square shell deep drawing tests of 5000 series aluminum alloy sheets from RT to 300°C temperatures were carried out in order to investigate temperature and strain rate dependence of mechanical properties and deep drawability. In these warm working temperatures, tensile strength (TS) decreases with the ambient temperatures, and these decrease of TS become smaller in high strain rate. Elongation (El) is nearly same from RT to 100°C, but it increases largely with the increase of temperature from 150 to 300°C, and these increase of El become larger in low strain rate. This change of El mainly depends on local elongation (LEl). Limiting drawing ratio (LDR) of square shell deep drawing in high speed forming becomes a little bigger than normal speed forming. The change of LDR is small in 100∼150°C, but it becomes larger from 200∼300°C, but LDR is smaller in high speed forming. ΔLDR shows the effect of working temperature from the LDR of RT. The effective experimental equation between ΔLDR and mechanical properties (TS, El, LEl) is developped.