Fracture Behavior of AlMg4.5Mn Weld Metal at Different Temperatures under Impact Loading

This paper deals with a three-component aluminum alloy AlMg4.5Mn that was welded using GTAW process in the shielded atmosphere of Ar+70%He+0.015%N2. The weld-metal toughness evaluated at three different temperatures instrumental Charpy pendulum impact testing to measure not only total energy, but also crack initiation energy and growth energy. Fractographic analysis fracture surfaces EDS large second-phase particles on fractured each temperature were carried out. indicated clearly distinguishable mechanism. It inferred absorbed closely correlated fracturing surfaces. Moreover, it concluded decrease amount microscopic voids dimples, decreased.