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2222材料工程  2017, Vol. 45 Issue (2): 39-45    DOI: 10.11868/j.issn.1001-4381.2015.000588
  研究论文 本期目录 | 过刊浏览 | 高级检索 |
高温熔体反应法制备Al-5Ti-1B细化剂
李贺1, 柴丽华1, 马腾飞2, 陈子勇1,*()
1 北京工业大学 材料科学与工程学院, 北京 100124
2 哈尔滨工业大学 材料科学与工程学院, 哈尔滨 150001
Synthesis of Al-5Ti-1B Refiner by Melt Reaction Method
He LI1, Li-hua CHAI1, Teng-fei MA2, Zi-yong CHEN1,*()
1 School of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
2 School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
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摘要 

利用高温熔体反应法成功制备Al-5Ti-1B细化剂。通过热力学计算,确定Al-5Ti-1B细化剂的起始反应温度,研究熔体温度对细化剂组织形貌及吸收率的影响。利用X射线衍射,扫描电子显微镜和X射线能谱仪观察细化剂的相组成和形貌,同时对Al-5Ti-1B细化剂铸锭进行高温挤压,并对挤压出的9.5mm丝材进行微观组织分析和细化实验。结果表明:细化剂主要由TiB2,TiAl3,α-Al相组成;850℃制备的细化剂铸锭组织形貌最佳,且Ti和B吸收率达到最佳匹配。挤压后TiAl3相呈细小的块状和TiB2弥散分布在基体内。添加0.2%(质量分数)细化剂后,纯铝的晶粒尺寸由3.99mm细化到0.45mm。

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李贺
柴丽华
马腾飞
陈子勇
关键词 Al-Ti-B熔体反应法热力学计算微观组织晶粒细化    
Abstract

Al-5Ti-1B refiner was successfully prepared by melt reaction method. Through the thermodynamics calculation, the initial reaction temperature was determined. The influence of reaction temperature on microstructure and absorption rate of the alloy was investigated. The phase and microstructure of the alloy were observed by X-ray diffraction, scanning electron microscope and energy dispersive spectrometer. The Al-5Ti-1B refiner was extruded at high temperature to wire with the diameter of 9.5mm, and then the refinement experiment was carried out on pure aluminium. The results indicate that the refiner consists of TiB2, TiAl3 and α-Al, and the microstructure prepared at 850℃ is the optimum and the absorption rate of Ti and B matches the best. The TiAl3 and TiB2 phases distribute homogeneously in the matrix after extrusion. When adding 0.2%(mass fraction) of Al-5Ti-1B refiner, the grain size of pure aluminium reduces from 3.99mm to 0.45mm.

Key wordsAl-Ti-B    melt reaction method    thermodynamics calculation    microstructure    grain refinement
收稿日期: 2015-05-12      出版日期: 2017-02-23
中图分类号:  TG146.2+1  
通讯作者: 陈子勇     E-mail: czy@bjut.edu.cn
作者简介: 陈子勇(1966-),男,教授,博士,从事专业:先进轻合金,联系地址:北京市朝阳区平乐园100号北京工业大学材料学院309北(100124),czy@bjut.edu.cn
引用本文:   
李贺, 柴丽华, 马腾飞, 陈子勇. 高温熔体反应法制备Al-5Ti-1B细化剂[J]. 材料工程, 2017, 45(2): 39-45.
He LI, Li-hua CHAI, Teng-fei MA, Zi-yong CHEN. Synthesis of Al-5Ti-1B Refiner by Melt Reaction Method. Journal of Materials Engineering, 2017, 45(2): 39-45.
链接本文:  
http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2015.000588      或      http://jme.biam.ac.cn/CN/Y2017/V45/I2/39
Fig.1  熔体反应法制备细化剂过程
Fig.2  熔体反应法制备的Al-5Ti-1B细化剂XRD分析
Fig.3  不同反应温度时制备的Al-5Ti-1B 细化剂SEM图 (a)800℃;(b)850℃;(c)900℃
Fig.4  Al-5Ti-1B细化剂的EDS分析 (a)图 3(a)中A点;(b)图 3(b)中B点
Fig.5  Ti,B吸收率随温度的变化
Fig.6  Al-5Ti-1B细化剂微观组织 (a)熔体反应法;(b)常规方法
Fig.7  常规方法(1)和熔体反应法(2)制备的细化剂细化效果
(a)添加前;(b)添加后,保温2min;(c)添加后,保温5min
Preparation
method
Before
addition/mm
After addition
for 2min/mm
After addition
for 5min/mm
Conventional method3.990.49 0.47
Melt reaction method3.990.510.45
Table 1  纯铝晶粒平均尺寸
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