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It is known that aluminum alloys can be classified as alloys for the production of castings and wrought alloys (rolling, extrusions, forgings and others). Wrought aluminum alloys are subdivided into heat-treatable alloys, those that respond to heat treatment to increase their mechanical strength and non heat-treatable alloys, whose mechanical properties can only be improved by cold working. The use of aluminum alloys has a great advantage due to the strength / weight ratio of Al, it has been used in industrial applications to different solutions, such as in the construction of automobiles, aerial and space vehicles, packaging and in overhead transmission lines. This paper aims to analyze the effect of heat treatment on the microhardness, ultimate tensile strength and in the elongation of the Al-0,18%Zr; Al-0.18%Zr-2.0%Mg and Al-0.18%Zr-6.0%Mg alloys compared to results obtained without heat treatment. The alloys were melted in a muffle furnace and cast in a water-cooled Cu mold.

The Hardening by cold work is capable of increasing the mechanical strength of non-ferrous metals. The combination of alloying elements in solid solution and cold working is extremely effective in achieving greater strength for aluminium alloys. However, some alloys may be susceptible to stress corrosion and are notoriously difficult to fabricate during hot and cold work. A requirement for adding the alloy elements in this work will be that the interaction between them will provide hardening by additional cold working, but with no occurrence of chemical interaction between them and not removing them from the solid solution. This paper aims to analyze the effect of cold working on mechanical properties of Al-0.18%Zr, Al-0.18%Zr-2.0%Mg and Al-0.18%Zr-6.0%Mg alloys compared to results obtained without cold working. The alloys were melted in a muffle furnace and cast in a water-cooled Cu mold.