Scholarlink

<p>This research primarily investigates the effects of varying oscillation frequencies on the cooling slope technique for the semisolid A339 aluminum alloy. It focuses on the microstructural evolution and mechanical characteristics, which have been studied in detail. The molten metal was poured over an inclined plate set at a 45° angle, measuring 500&#xa0;mm in length, with a pouring temperature of 580&#xa0;°C. The cooling slope was subjected to vibration frequencies of 15, 30, 45, and 60&#xa0;Hz. For comparison, additional experiments were conducted using gravity casting and non-vibrating cooling slope casting. The experimental results demonstrated that the application of vibration had a significant impact on the microstructure. Specifically, it was found that vibration increased nucleation rates and contributed to the breaking of dendrite arms. The study highlighted that the convection of the melt induced by vibration played a crucial role in forming non-dendritic primary aluminum particles. Notably, specimens cast using a vibration frequency of 30&#xa0;Hz (VCS30) exhibited the smallest grain size (58.53&#xa0;µm) and the highest sphericity (0.76) of the primary phase in the aluminum alloy. Additionally, these processing conditions resulted in the highest tensile strength (208&#xa0;MPa), ductility (5.52%), hardness (89&#xa0;BHN), and compressive strength (326&#xa0;MPa) for the A339 hypoeutectic alloy. The analysis of fracture behavior indicated a shift from brittle to ductile fracture modes in the hypoeutectic alloy.</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 Vibration Frequency on Microstructure and Mechanical Characteristics of Semisolid A339 Al Alloy in Cooling Slope Processing

  • 期刊论文

  • 发表日期：

    2026年1月12日

查看全文
  • Sujeet Kumar Gautam,
  • Himanshu Khandelwal,
  • Sudip Kumar Samanta,
  • Vineet Chak

摘要

This research primarily investigates the effects of varying oscillation frequencies on the cooling slope technique for the semisolid A339 aluminum alloy. It focuses on the microstructural evolution and mechanical characteristics, which have been studied in detail. The molten metal was poured over an inclined plate set at a 45° angle, measuring 500 mm in length, with a pouring temperature of 580 °C. The cooling slope was subjected to vibration frequencies of 15, 30, 45, and 60 Hz. For comparison, additional experiments were conducted using gravity casting and non-vibrating cooling slope casting. The experimental results demonstrated that the application of vibration had a significant impact on the microstructure. Specifically, it was found that vibration increased nucleation rates and contributed to the breaking of dendrite arms. The study highlighted that the convection of the melt induced by vibration played a crucial role in forming non-dendritic primary aluminum particles. Notably, specimens cast using a vibration frequency of 30 Hz (VCS30) exhibited the smallest grain size (58.53 µm) and the highest sphericity (0.76) of the primary phase in the aluminum alloy. Additionally, these processing conditions resulted in the highest tensile strength (208 MPa), ductility (5.52%), hardness (89 BHN), and compressive strength (326 MPa) for the A339 hypoeutectic alloy. The analysis of fracture behavior indicated a shift from brittle to ductile fracture modes in the hypoeutectic alloy.