Análise da microestrutura e da microdureza da liga A380 tixoconformadas com adição de refinador e modificador

Abstract

The development of mechanical manufacturing techniques and processes has progressed and updated over the years. Among them the thixformation process, being a mechanical manufacturing process in which a metal is used in the semi-solid state, where according to Batalha (2003): “The temperature is generally chosen for a ratio of 60% solid phase and 40% phase. net ”. When it reaches the expected temperature, the metal is pressed into a matrix, obtaining complex shapes only by using the forming process. According to Batalha (2003) the advantages of the process are the short time to finalize the item, the possibility of making pieces with complex geometries, less porosity and segregation since the semi-solid state favors diffusion and solubility. However, the process has some disadvantages, such as the metal's malleability time being short, high costs and the process restricted to only a few alloys. One of the most common metals used in the thixing process is aluminum because of its cost, recyclability and ability to be worked as semi-solid. Thus, the A380 aluminum alloy of recycled origin was thixformed, it was possible to perform all the steps and obtain values of microhardness, metallography and stress data by deformation. This it was possible to analyze and understand that the elements added in the alloy (Titanium and Strontium) affect the microstructure and allow changing values such as the maximum supported stress as well as its microhardness, besides observing the existence of an optimization point to obtain higher results.