article · Journal of Materials Research and Technology
An Al-Zn-Mg-Cu 7055 aluminium alloy was produced using spray forming, followed by hot extrusion and T76 heat treatment, to examine its microstructure, mechanical performance, and fatigue behaviour. The resulting alloy displayed no notable segregation or porosity defects, alongside refined grains and finely dispersed precipitates. Mechanical evaluations demonstrated high tensile strength and elongation, while revealing strong directional anisotropy: properties aligned with the extrusion direction proved superior to those in the transverse direction. Cyclic stress testing confirmed an extended fatigue life along the extrusion direction, driven by texture-induced resistance to crack initiation and growth. Together, spray forming and hot extrusion enhance overall alloy performance, positioning the material as a strong candidate for critical structural components in the aerospace sector.
Understanding how manufacturing steps alter metal textures helps engineers predict material failure under stress. Spray-formed aluminium alloys processed through hot extrusion exhibit high strength and crack resistance in specific orientations. This knowledge assists designers in aligning material properties with directional stresses, which is vital when manufacturing dependable lightweight structural parts for aerospace systems.
The abstract specifically highlights the alloy as a candidate for critical aerospace applications, where high strength and fatigue resistance are essential. The primary end users would be aerospace manufacturers and structural component designers. This represents applied laboratory-tested metallurgy research, demonstrating effective fabrication and mechanical validation, but the abstract does not indicate whether industrial-scale pilot production or component testing has taken place.
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The Al-Zn-Mg-Cu 7055 aluminum alloy was meticulously fabricated through spray forming (SF) technology, followed by hot extrusion and T76 treatment. This comprehensive process allowed for a thorough investigation of its microstructural characteristics, mechanical properties, and fatigue behavior. Post-treatment analysis revealed that the SF-7055 aluminum alloy exhibited no notable segregation or porosity defects, ensuring its exceptional quality and reliability. The microstructural analysis revealed a uniform distribution of refined grains and dispersed precipitates, contributing to the material's strength. Mechanical testing demonstrated that the hot extruded SF-7055 aluminum alloy exhibits superior tensile strength and elongation, with significant anisotropy in mechanical properties favoring the extrusion direction (ED) over the transverse direction (TD). Fatigue testing under varying cyclic stresses revealed an extended fatigue life in the ED-oriented specimens, attributed to the texture-induced resistance to crack initiation and propagation. The study underscores the effectiveness of SF and hot extrusion in enhancing the SF-7055 aluminum alloy's performance, making it a viable candidate for critical aerospace applications. The findings provide valuable insights into the relationship between processing, microstructure, and properties, offering a pathway to the design and fabrication of high-performance aluminum alloys.
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DOI: 10.1016/j.jmrt.2024.05.093
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