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| Al-5Ti-1B对A357合金晶粒细化作用的研究 | |
| 引用本文： | 朱兆军,王宏伟,魏尊杰. Al-5Ti-1B对A357合金晶粒细化作用的研究[J]. 材料科学与工艺, 2006, 14(2): 171-173,177 |
| 作者姓名： | 朱兆军 王宏伟 魏尊杰 |
| 作者单位： | 哈尔滨工程大学,机电学院,黑龙江,哈尔滨,150001;哈尔滨工业大学,材料科学与工程学院,黑龙江,哈尔滨,150001;哈尔滨工业大学,材料科学与工程学院,黑龙江,哈尔滨,150001 |
| 摘 要： | 采用Al-5Ti-1B中间合金作为细化剂细化A357合金,考察细化剂加入量、保温温度及熔体在不同温度下保温时间对晶粒尺寸的影响,研究了Al-5Ti-1B中间合金对A357合金晶粒细化效果.研究表明:Al-5Ti-1B可明显减小A357合金的晶粒尺寸,并且在较长的时间内保持良好的细化效果;熔体长时间静置后易出现(钛)偏析,底部Ti含量比顶部要高,致使铸件整体细化效果大大降低;定期对熔体进行搅拌可有效消除偏析. |
| 关 键 词： | A357合金 Al-5Ti-1B中间合金 细化 偏析 |
| 文章编号： | 1005-0299（2006）02-0171-03 |
| 收稿时间： | 2004-09-01 |
| 修稿时间： | 2004-09-01 |
Study on grain refinement of A357 alloy using Al-5Ti-1B |
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| ZHU Zhao-jun,WANG Hong-wei,WEI Zun-jie. Study on grain refinement of A357 alloy using Al-5Ti-1B[J]. Materials Science and Technology, 2006, 14(2): 171-173,177 | |
| Authors: | ZHU Zhao-jun WANG Hong-wei WEI Zun-jie |
| Affiliation: | 1. College of Mechanics and Electronics Engineering, Harbin Engineering University, Harbin 150001, China; 2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001 ,China |
| Abstract: | When insulated in a maintaining furnace for a relatively long period of time, the performance of liquid alloy treated by Al -5Ti - 1B deteriorated because of inoculation fade and segregation. This paper discusses how A357 alloy was refined by using Al -5Ti - 1B matter alloy as a refining agent. The effects of the amount of refining agent, holding temperature and holding time were investigated. The effects of Al -5Ti - 1B on grain refinement were also studied. The results indicated that Al - 5Ti - 1B can significantly decrease the grain size of A357 alloy and the refine function can be retained for a long time. However, segregation of Ti can occur after the alloy is steady for a long time. The Ti content at the bottom is higher than that at the top of the furnace. Ti segregation can be avoided by stirring the molten alloy periodically. |
| Keywords: | A357 alloy Al-5Ti- 1B master alloy refinement segregation |
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