Dealloying Superalloy by Liquid Mg for the Selective Extraction of Ni
发布时间：2022-12-10
点击次数：
DOI码：10.1007/s12540-022-01249-x
发表刊物：Metals and Materials International
摘要：Liquid Mg is capable of quickly eroding the refractory Ni-based superalloy and selectively dissolve Ni, which opens up a new avenue for the recycling of superalloy scraps for comprehensive metal reclamation. This study aims at investigating the underlining mechanism and kinetics of the selective dissolution of Ni from Inconel 718 (one type of Ni-based superalloy) with liquid Mg, by experimenting at 750, 800, and 850 °C for various amounts of time in an inert atmosphere. This selective dissolution process is also known as liquid metal dealloying. Results show that a permeable dealloyed layer was formed resulting from the preferential dissolution of Ni over other metallic elements (e.g., Fe, Cr, Nb, Mo, and Ti). At the dealloying forefront, the grain boundaries of the matrix γ phase were preferentially eroded by liquid Mg. The opposite concentration gradients of Ni (4–9 wt%) and Mg (12–18 wt%) cross the dealloyed layer suggested their counter diffusion. A higher heating temperature substantially increased the dealloying rate.
论文类型：期刊论文
卷号：29
页面范围：833-844
是否译文：否
发表时间：2023-12-05
收录刊物：SCI