Crystal-grain refinement of materials under an ultra-strong gravitational field

Iguchi, Yusuke*; Shibata, Yasuhiro*; Uchida, Yuta*; Huang, X.*; Ono, Masao; Okayasu, Satoru; Mashimo, Tsutomu

Advanced Materials Research, 15-17, p.639 - 642, 2007/00

https://doi.org/10.4028/www.scientific.net/AMR.15-17.639

In this study, we investigate the crystalline states and conditions for the grain-refinement of BiSb alloy. It was considered under an ultra strong gravity field, the crystals were fine-grained from the primary grain sizes of several mm to several tens of mm, and the crystal growth followed with formation of graded-composition structure due to sedimentation of atoms along the direction of gravity. It was found that for the crystal-grain refinement in BiSb alloy the minimum gravitational field and the minimum time duration were at least 160,000 G and 10 hours, respectively at about 200 C.