Balancing phases for obtaining the same hardness in Al-Cu-Zn alloys with different compositions
DOI:
https://doi.org/10.3989/revmetalm.204Keywords:
Balance diagram, Hardness, Phases, Ternary alloyAbstract
Five Al-Cu-Zn alloy samples were developed using different chemical compositions. All samples have the same hardness of 67 RB, which was obtained by a methodology that predicts the hardness of alloys. Each alloy sample was analyzed using X-ray diffraction, scanning electron microscope, and hardness measurements. This analysis permitted to know the change in chemical composition for maintaining the same hardness in each sample. The samples used in equilibrium have of three phases, η, α and τ’, however, in these samples there are other phases present, such as ε, β and θ. As is well known, if the chemical percentage is changed in the alloys, the phase percentage changes, and therefore the mechanical properties. This work results show that even when the chemical percentages drastically change, the hardness remains the same. The principal cause for maintaining the same hardness is using the contact area in the white zone composed by η and ε with respect to the other phases. If the perimeter of contact of the white zone is kept within a specific range, the hardness of all samples will be the same with a margin of error that is less than 3%. This is important to the development to new alloys.
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