Mechanical properties and deformation behavior of Al–4Mg–0.4Sc–1.5Mm alloy at room temperature

Tensile test at room temperature has been performed on the Al–4Mg–0.4Sc–1.5Mm (Misch metal) alloy sheet with different reduction rate at crosshead speed of 0.036 mm min−1. The experimental results show that the fracture strain is strongly sensitive to cold rolling reduction rate, and the fracture strain increases with an increase of cold rolling reduction. The Portevin–LeChatellier (P–L) effect with a significantly serrate oscillation of stress–strain curves has been shown to be very regular for Al–4Mg–0.4Sc–1.5Mm alloy during tensile deformation. The onset strain decreases with an increase of cold rolling reduction rate. The average interval and the amplitude of stress–strain oscillation can be described by an exponential function with the strain.