Influence of C/Ti stoichiometry in TiC_x on the grain refinement efficiency of Al–Ti–C master alloy
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2017年第7期
论文作者：Huabing Yang Tong Gao Haichao Wang Jinfeng Nie Xiangfa Liu
文章页码：616 - 622
摘 要：TiCx contained Al–Ti–C is a kind of grain refiner for Al alloys. In this work, the influence of C/Ti stoichiometry, i.e. the x value in TiCx on grain refinement efficiency was investigated. TiCx particles have been obtained in five Al–5Ti–m C（m = 0.1, 0.5, 0.8, 1, 1.25） master alloys and the x values were measured to be0.72, 0.75, 0.79, 0.81 and 0.8, respectively. It was found that the refinement performance of the master alloys had a close relationship with the x value of TiCx . The Al–5Ti–m C alloy with lower-x TiCx shows better refinement efficiency and anti-fading capability. It is supposed that TiCx particles with lower x are more preferred to release Ti atoms during nucleating process and have a better Ti-absorbing capability.This contributes to the Ti-rich zone formation at TiCx /melt interface, thus enhancing the refinement and anti-fading capability.
Huabing Yang1，Tong Gao1，Haichao Wang1，Jinfeng Nie2，Xiangfa Liu1
1. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University2. Nano Structural Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology
摘 要：TiCx contained Al–Ti–C is a kind of grain refiner for Al alloys. In this work, the influence of C/Ti stoichiometry, i.e. the x value in TiCx on grain refinement efficiency was investigated. TiCx particles have been obtained in five Al–5Ti–m C（m = 0.1, 0.5, 0.8, 1, 1.25） master alloys and the x values were measured to be0.72, 0.75, 0.79, 0.81 and 0.8, respectively. It was found that the refinement performance of the master alloys had a close relationship with the x value of TiCx . The Al–5Ti–m C alloy with lower-x TiCx shows better refinement efficiency and anti-fading capability. It is supposed that TiCx particles with lower x are more preferred to release Ti atoms during nucleating process and have a better Ti-absorbing capability.This contributes to the Ti-rich zone formation at TiCx /melt interface, thus enhancing the refinement and anti-fading capability.
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