The structure and mechanical properties of Al-Mg-Mn alloys shaped in the process of thermomechanical treatment

Purpose: The aim of research was to investigate the effect of heat treatment and low-temperature thermomechanical treatment (LTMT) on the structure and mechanical properties of Al-Mg-Mn alloys. Design/methodology/approach: The range of researches included: performance of heat treatment and low-temperature thermomechanical treatment of AlMg1.5 and AlMg3.5Mn alloys, carry out of static tensile tests, measurements of hardness, metallographic observation (TEM) and fractography (SEM). Findings: Analysis of the results allows to determine the effect of precipitation hardening and low-temperature thermomechanical treatment on the structure and mechanical properties of AlMg1.5 and AlMg3.5Mn alloys and to determine the effect on the topography of the specimens fracture after decohesion in tensile tests. Moreover, SEM researches allow to identity the chemical composition of precipitates in the structure of investigated alloys. Practical implications: The obtained results may serve as a basis for optimization of the process of the material used as components of vessels. Originality/value: The mechanical properties of the investigated aluminium alloys increase with the quantity of Mg, independently of their state and the parameters of heat treatment and low-temperature thermomechanical treatment. More refinement of precipitations, which affect the mechanical properties in ageing, ensured by LTMT compared with conventional heat treatment.