|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Applications of Solidification Fundamentals
||Solidification Characteristics of CNTs/Mg Composite with Ultrasonic
||Yuansheng Yang, Fuze Zhao, Xiaohui Feng
|On-Site Speaker (Planned)
Carbon nano-tubes (CNTs)/Mg composite has low density and good mechanical properties. One of fabrication methods for CNTs/Mg composite is casting which key step is dispersing CNTs in alloy melting uniformly. This paper researches the dispersion behavior of CNTs and solidification CNTs/Mg composite by ultrasonic processing. Experimental results show that CNT clusters can be separated in alloy melt well with high power ultrasonic processing. One of ultrasonic effects is acoustic streaming which causes dispersion of CNT clusters at the macro level, and another one is acoustic cavitation by which the CNT clusters are separated in melt at the micro level. The CNT cluster separation under ultrasonic is caused by bubble collapse. Higher sound pressure amplitude is good for the separation of CNT clusters. When sound pressure amplitude is high, the bubble threshold initial radius is small and more bubbles would collapse. With high power ultrasonic processing, the as-cast microstructure is refined.
||Planned: Supplemental Proceedings volume