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<p>This work aims to evaluate Al–Si–Zn alloys, specifically Al4Si5Zn, Al5Si5Zn, and Al6Si5Zn, in terms of their microstructural and mechanical behavior for use in semisolid processing. For this purpose, the alloys were produced using electromagnetic stirring, with their chemical composition fixed at 5 wt% (by mass) zinc and varying amounts of silicon (4, 5, and 6 wt%). After the production of the raw materials, they were reheated to a semisolid temperature (equivalent solid fraction of 45%), stabilized at this temperature for 0, 30, 90, and 210 s, and then thixoforged in two distinct equipment: an eccentric press and a pneumatic press, which generate different deformation rates. Heat treatments were conducted to promote the globularization of the primary phase particles, resulting in an average size of approximately 49 and 58&#xa0;µm for the primary globules for the pneumatic and eccentric press, respectively. As a final result, the alloys showed slight variation in both primary globule size and mechanical behavior under all analyzed conditions. To characterize the mechanical behavior, tensile tests were performed, yielding satisfactory results with tensile strength values exceeding 200&#xa0;MPa for all thixoforged alloys using the pneumatic press. The average results are yield strength of 117&#xa0;MPa, ultimate tensile strength of 220&#xa0;MPa, elongation of 6.9, and residual porosity of 0.7 %. Therefore, the use of these alloys via thixoforging, mainly when processed with a pneumatic press, proves viable for semisolid processing.</p>

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Microstructural and Mechanical Behavior of Thixoforged Al–Si–Zn Alloys

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • Bruna Vilas Bôas,
  • Luis Vanderlei Torres,
  • Eugênio José Zoqui

摘要

This work aims to evaluate Al–Si–Zn alloys, specifically Al4Si5Zn, Al5Si5Zn, and Al6Si5Zn, in terms of their microstructural and mechanical behavior for use in semisolid processing. For this purpose, the alloys were produced using electromagnetic stirring, with their chemical composition fixed at 5 wt% (by mass) zinc and varying amounts of silicon (4, 5, and 6 wt%). After the production of the raw materials, they were reheated to a semisolid temperature (equivalent solid fraction of 45%), stabilized at this temperature for 0, 30, 90, and 210 s, and then thixoforged in two distinct equipment: an eccentric press and a pneumatic press, which generate different deformation rates. Heat treatments were conducted to promote the globularization of the primary phase particles, resulting in an average size of approximately 49 and 58 µm for the primary globules for the pneumatic and eccentric press, respectively. As a final result, the alloys showed slight variation in both primary globule size and mechanical behavior under all analyzed conditions. To characterize the mechanical behavior, tensile tests were performed, yielding satisfactory results with tensile strength values exceeding 200 MPa for all thixoforged alloys using the pneumatic press. The average results are yield strength of 117 MPa, ultimate tensile strength of 220 MPa, elongation of 6.9, and residual porosity of 0.7 %. Therefore, the use of these alloys via thixoforging, mainly when processed with a pneumatic press, proves viable for semisolid processing.