Scholarlink

<p>Friction stir additive manufacturing (FSAM) was used to fabricate five-layer builds from 6063-T6 aluminum alloy sheets that had a thickness of 4&#xa0;mm, a length of 120&#xa0;mm, and a width of 30&#xa0;mm. Despite the critical role of rotational speed (RS) in controlling heat input and material flow during FSAM, its systematic influence on microstructural evolution and mechanical properties remains insufficiently understood. To address this, three RSs (800, 1000, and 1200&#xa0;rpm) were investigated for builds consisting of five stacked plates under constant conditions, with evaluations of microstructure, hardness, and mechanical performance. The stirred zone exhibited fine equiaxed grains, ranging from 16.82 ± 2.27&#xa0;μm at 800&#xa0;rpm to 8.14 ± 1.74&#xa0;μm at 1200&#xa0;rpm, resulting from dynamic recrystallization. Microhardness increased along the deposition height, with the highest local value (57.8 HV) observed at the top of the 1200&#xa0;rpm sample, and the lowest (50.6 HV) near the base material (BM), while the average FSAM hardness (54.86 ± 2.29 HV) remained lower than the BM (79.85 ± 3.02 HV). Tensile testing showed reduced strength (144.51 ± 23.35 to 163.69 ± 29.46&#xa0;MPa) but improved ductility compared to the BM (245 ± 34.22&#xa0;MPa), particularly at higher RS. Overall, the FSAM sample processed at 1200&#xa0;rpm achieved the finest grain structure and the best combination of strength and ductility, representing the optimal fabrication condition.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effect of Rotational Speed on Microstructure and Mechanical Properties of 6063-T6 Aluminum by Friction Stir Additive Manufacturing

  • 期刊论文

  • 发表日期：

    2026年5月23日

查看全文
  • M. M. Tawfik,
  • M. Fathi,
  • M. M. Dewidar

摘要

Friction stir additive manufacturing (FSAM) was used to fabricate five-layer builds from 6063-T6 aluminum alloy sheets that had a thickness of 4 mm, a length of 120 mm, and a width of 30 mm. Despite the critical role of rotational speed (RS) in controlling heat input and material flow during FSAM, its systematic influence on microstructural evolution and mechanical properties remains insufficiently understood. To address this, three RSs (800, 1000, and 1200 rpm) were investigated for builds consisting of five stacked plates under constant conditions, with evaluations of microstructure, hardness, and mechanical performance. The stirred zone exhibited fine equiaxed grains, ranging from 16.82 ± 2.27 μm at 800 rpm to 8.14 ± 1.74 μm at 1200 rpm, resulting from dynamic recrystallization. Microhardness increased along the deposition height, with the highest local value (57.8 HV) observed at the top of the 1200 rpm sample, and the lowest (50.6 HV) near the base material (BM), while the average FSAM hardness (54.86 ± 2.29 HV) remained lower than the BM (79.85 ± 3.02 HV). Tensile testing showed reduced strength (144.51 ± 23.35 to 163.69 ± 29.46 MPa) but improved ductility compared to the BM (245 ± 34.22 MPa), particularly at higher RS. Overall, the FSAM sample processed at 1200 rpm achieved the finest grain structure and the best combination of strength and ductility, representing the optimal fabrication condition.