Yuanzheng Cao , Xiaojuan Shang , Guangkai Yang , Jie Wang , Yiwang Jia , Qibin Liu , Yun Che , Sanquan Men , Xiang Li , Yuliang Zhao , Da Shu
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引用次数: 0
Abstract
This study explores the grain refinement mechanisms of primary α-Al during solidification of Al-13 wt% Cu alloy modified by FeCoCrNiAl high-entropy alloy (HEA) particles via ultrasonic treatment. In situ X-ray radiography combined with machine learning-based computer vision techniques was employed to systematically analyze the nucleation and growth behaviors of α-Al grains. Results indicate a significant grain refinement effect associated with increased HEA particle content and higher cooling rates. Specifically, the addition of 2.0 wt% HEA particles reduce the primary α-Al grain size notably, achieving approximately 213 μm at a cooling rate of 1.0 K/s. At a cooling rate of 0.2 K/s, raising the HEA content from 0.5 to 2.0 wt% markedly increases the maximum nucleation rate (from 8.6 to 30.3 crystals/mm3/s), shortens the time required for grain growth cessation (from 18 s to 10 s). Similarly, at a fixed HEA content (1.0 wt%), increasing the cooling rate from 0.2 K/s to 1.0 K/s enhances the maximum nucleation rate (from 25.7 to 93.9 crystals/mm3/s) and reduces the grain growth cessation time (from 15 s to 9 s). Grain size distributions consistently exhibit normal distribution patterns. The addition of HEA particles significantly inhibits grain growth and reduces solute enrichment during solidification. These findings demonstrate that FeCoCrNiAl HEA particles facilitate grain refinement by effectively promoting heterogeneous nucleation and inhibiting grain growth.
期刊介绍:
Ultrasonics Sonochemistry stands as a premier international journal dedicated to the publication of high-quality research articles primarily focusing on chemical reactions and reactors induced by ultrasonic waves, known as sonochemistry. Beyond chemical reactions, the journal also welcomes contributions related to cavitation-induced events and processing, including sonoluminescence, and the transformation of materials on chemical, physical, and biological levels.
Since its inception in 1994, Ultrasonics Sonochemistry has consistently maintained a top ranking in the "Acoustics" category, reflecting its esteemed reputation in the field. The journal publishes exceptional papers covering various areas of ultrasonics and sonochemistry. Its contributions are highly regarded by both academia and industry stakeholders, demonstrating its relevance and impact in advancing research and innovation.