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

Radica Prokić Cvetković, Olivera Popović, Ljubica Radović, Aleksandar Sedmak () and Ivana Cvetković
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Radica Prokić Cvetković: Faculty of Mechanical Engineering, University of Belgrade, 11120 Kraljice Marije, 11132 Belgrade, Serbia
Olivera Popović: Faculty of Mechanical Engineering, University of Belgrade, 11120 Kraljice Marije, 11132 Belgrade, Serbia
Ljubica Radović: Military-Technical Institute, Ratka Resanovica 2, 11132 Belgrade, Serbia
Aleksandar Sedmak: Faculty of Mechanical Engineering, University of Belgrade, 11120 Kraljice Marije, 11132 Belgrade, Serbia
Ivana Cvetković: Faculty of Mechanical Engineering, University of Belgrade, 11120 Kraljice Marije, 11132 Belgrade, Serbia

Sustainability, 2023, vol. 15, issue 2, 1-12

Abstract: This paper deals with a three-component aluminum alloy AlMg4.5Mn that was welded using a GTAW process in the shielded atmosphere of Ar+70%He+0.015%N 2 . The weld-metal toughness was evaluated at three different temperatures using instrumental Charpy pendulum impact testing to measure not only the total energy, but also the crack initiation energy and the crack growth energy. Fractographic analysis of the fracture surfaces and EDS analysis of large second-phase particles on fractured surfaces at each temperature were also carried out. Fractographic analysis at different temperatures indicated a clearly distinguishable fracture mechanism. It was inferred that the absorbed energy was closely correlated with the fracturing of surfaces. Moreover, it was concluded that with decrease in the amount of microscopic voids and dimples, the total energy absorbed also decreased.

Keywords: AlMg4.5Mn alloy; GTAW; weld metal; fracture surface; fracture mechanism (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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