The Effect of Enhanced Solution Treatment on Microstructures and Properties of 6013 Type Aluminum Alloy

Abstract

The effect of enhanced solution treatment on microstructures, tensile properties, intergranular corrosion and exfoliation corrosion of a 6013 type aluminum alloy proceeded via various solution treatment were investigated by optical microscopy (OM), scanning electron microscopy (SEM), tension testing and corrosion resistance testing. The results show that compared with the conventional solution treatment (560°C×2 h), the enhanced solution treatment (560°C×2 h+570°C×2 h) can improve ultimate tensile strength and elongation, the corrosion resistance become worse after 151°C×8 h+191°C×8 h artificial aging. The tensile strength increase is believed to resulting from the coarse second phases dissolve. The corrosion resistance decrease is due to grain growth.

Effect of Solution Treatment on Microstructure and Mechanical Properties of Hot-Extruded Cu-15Ni-8Sn Alloy

“…In the process of solution treatment, on one hand,Sn gradually dissolved in the matrix, resulting in solid solution strengthening; on the other hand, with the increase of solution temperature and holding time, the grain size becomes larger and larger, in the alloy of the second phase continue to dissolve, resulting in lower alloy hardness. Thus, in the process of solution treatment, the changes in the mechanical properties of the alloy is the result of the interaction between these two aspects [10].The softening of the alloy is mainly due to the dissolution of the second phase in the a d c b alloy during the solution treatment. The second phase can prevent dislocation movement in the grains, strengthening the alloy [11], The dissolution of the second phase weakens this effect, and the hardness of the alloy decreases.…”