Abstract
The effects of Er additions on the microstructure and tensile properties of cast Al–15Zn–2.5Mg–2.5Cu aluminum alloy have been investigated. The results show that by adding 1 wt% Er grain refiner in the cast alloy, the grains can be refined to a fine degree. The microstructures and fracture surfaces of cast aluminum alloy samples were examined by SEM. In addition, the Er modified the eutectic structure from a coarse plate-like and acicular structure to a fine branched and fibrous one. The tensile properties were improved by the addition of Er, and good ultimate tensile strength (325 MPa) but poor elongation (6%) were obtained when the Er addition was 1 wt%. Furthermore, fractographic examinations revealed that refined pore and spheroidized a-Al dendrite were responsible for the high ultimate tensile strength. At higher magnifications, unrefined specimens showed cracking along the grains, whereas Er-refined specimens showed cracks in individual intermetallic compounds.
The original version of this chapter was revised: Authors have been affiliated with correct addresses. The erratum to this chapter is available at https://doi.org/10.1007/978-3-319-72284-9_211
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Kord, S., Alipour, M., Siadati, M.H., Kord, M., Koppad, P.G. (2018). Effects of Rare Earth Er Additions on Microstructure and Mechanical Properties of an Al–Zn–Mg–Cu Alloy. In: Martin, O. (eds) Light Metals 2018. TMS 2018. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-72284-9_60
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DOI: https://doi.org/10.1007/978-3-319-72284-9_60
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