Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7997703 | Journal of Alloys and Compounds | 2016 | 8 Pages |
Abstract
Solvent refining of Al-Si-B alloy samples with different amounts of Ti additions are carried out, which confirms a high B removal rate with excessive Ti addition. An apparent segregation coefficient is introduced to characterize the segregation between primary Si and Al-Si melt, which are determined to be 0.0471 with 575 ppma Ti addition at the cooling rate of 50 mK·sâ1. Temperature dependence of XTi(l)inAl-SimeltXB(l)inAl-Simelt2, individual Ti and B contents in the Al-29.3at.%Si melt from 1323 to 1123 K are calculated. It proves that TiB2 precipitates before the primary Si formation, which causes the decrease of B contents in the Al-Si melt and contributes to the high B removal rate. Moreover, BSE/SEM observation of TiB2 and (Al,Ti,Si) phase indicates a new competitive reaction mechanism in Al-Si-Ti-B system.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Boyuan Ban, Jingwei Li, Xiaolong Bai, Qiuxiang He, Jian Chen, Songyuan Dai,