Year: 1957
Type: report
Abstract: A controlled-atmosphere induction-heated furnace was devised to permit treatment of melted beryllium with ultrasonics. Operating procedures were developed and effectiveness of the equipment was established in a series of fourteen melts with several metals, including copper. Ultrasonic grain refinement was accomplished. A total of 25 beryllium melts were prepared, including four with additives of nickel, zirconium, silicon, and titanium. Ultrasonic treatment over a range of power and frequency did not reduce grain size below that reportedly accomplished by chill casting in any of the beryllium melts, including those wth the additives. It was observed that nucleation in beryllium, with or without ultrasonics, was initiated essentially at externul surfaces; there being little evidence of internal nucleation. Results are briefly evaluated on the basis of beterogeneous nucleation theory. (auth)
DOI: 10.2172/4303497
Authors: N Maropis, J Jones
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
OpenAlex ID: W75924890