Influence of the homogenization annealing on microstructure and mechanical properties of AlZn5,5Mg2,5Cu1,5 alloy

Abstract

In the course of homogenizing annealing of aluminium alloys being cast continually or semi-continually it appears that chemical in homogeneity takes off within separate dendritic cells (crystal segregation). It is about a diffusional process that takes place at the temperature which approaches the liquid temperature of the material. In that process the transition of soluble intermetallic compounds and eutectic to solid solution occurs and it suppresses crystal segregation significantly. Temperature, homogenization time, the size of dendritic cells and diffusion length influence homogenizing process. The article explores the optimization of homogenizing process in terms of its time and homogenizing annealing temperature which influence mechanical properties of AlZn5,5Mg2,5Cu1,5 alloy.

Selected Al Alloy and Analyses of its Decrease Machinability

“…[6,7] First, the structure was analyzed in unetched condition.Samples were analyzed by light microscope Olympus LEXT OLS 3100. [8,9]For samples OK ( Fig. 3) we could observe uneven distribution of phases α and intermetallic phases.…”

Influence of Ca, Sb and heat treatment on AlSi9CuMnNi alloy in frame of their properties from view of machining

“…The entire course of the heat treatment process took approximately 16 hours. [1,[6][7][8][9] Tab. Experimental samples were machined on a lathe Emco Mat -14 S (at the FME available).…”

“…Heat treatment of aluminium alloys can be in the sense for CSN 42 0056 defined as the process by which a product or product parts in solid state is subjected to one or more cycles of annealing to achieve the desired structure or substructure and properties. [1,[6][7][8][9] Modification of aluminum alloys is process by which the melt is deliberately modified by various elements in order to influence the mechanism of eutectic solidification. Modification changes the morphology and size of crystals of silicon (in the case of Silumin), causing a significant increase in mechanical properties compared to unmodified alloys.…”

Analysis of Decrease Machinability Possible Causes for Claimed Alloy

“…Within the solution differences between rods were compared. samples were made from the rods, which were then subjected to the following analyzes [7,8,9,10,11,12,13]: Chemical analysis was realized on the optical emission spectrometer BAS Q4 Tasman. The analysis results are shown in Table 1.…”