Microstructure and Grain Refining Efficiency of Al-5Ti-1B Grain Refiner Produced by Electromagnetic Stirring and Castex Process

Wang Shuncheng1; Zheng Kaihong1; Qi Wenjun1; Wen Jinglin2; Li Jianxiang3

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Microstructure and Grain Refining Efficiency of Al-5Ti-1B Grain Refiner Produced by Electromagnetic Stirring and Castex Process
Vol. 31, Issue 5, Pages: 393-397(2011)
Published： 2011 ，
DOI：

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[1]王顺成,郑开宏,戚文军,温景林,李建湘.电磁搅拌连续铸挤Al-5Ti-1B合金的组织与晶粒细化效果[J].特种铸造及有色合金,2011,31(05):393-397+385.

Wang Shuncheng1, Zheng Kaihong1, Qi Wenjun1, et al. Microstructure and Grain Refining Efficiency of Al-5Ti-1B Grain Refiner Produced by Electromagnetic Stirring and Castex Process. [J]. Special Casting & Nonferrous Alloys 31(5):393-397(2011)
[1]王顺成,郑开宏,戚文军,温景林,李建湘.电磁搅拌连续铸挤Al-5Ti-1B合金的组织与晶粒细化效果[J].特种铸造及有色合金,2011,31(05):393-397+385. DOI：

Wang Shuncheng1, Zheng Kaihong1, Qi Wenjun1, et al. Microstructure and Grain Refining Efficiency of Al-5Ti-1B Grain Refiner Produced by Electromagnetic Stirring and Castex Process. [J]. Special Casting & Nonferrous Alloys 31(5):393-397(2011) DOI：

摘要

采用电磁搅拌连续铸挤工艺成形Al-5Ti-1B合金线

利用等离子体发射光谱仪、光学显微镜、X射线衍射仪和扫描电镜研究了Al-5Ti-1B合金线的组织与晶粒细化效果

并与Al-5Ti-1B合金锭进行了比较。结果表明

通过中间包电磁搅拌和连续铸挤成形过程中半固态剪切搅拌和剧塑性变形作用

可细化TiAl3相尺寸

改善TiB2粒子的分布状态

TiAl3相为细小块状

TiB2粒子弥散分布于α-Al基体中。Al-5Ti-1B合金线的晶粒细化能力增强

纯铝中添加0.2%的Al-5Ti-1B合金线静止5min

晶粒平均尺寸可细化至223μm

静止180min

晶粒平均尺寸为316μm。

Abstract

The Al-5Ti-1B master alloy was produced by electromagnetic stirring and castex process.Microstructure and grain refinement efficiency of Al-5Ti-1B master alloy were investigated by ICP

OM（optical microscope）

XRD（X-ray diffraction） and SEM（scanning electron microscope）

and compared with that of Al-5Ti-1B alloy ingot.The results show that TiAl3 phase is refined and distribution of TiB2 particle is improved in the Al-5Ti-1B master alloy as a result of effects of electromagnetic stirring in tundish and semi-solid shearing effects as well as severe plastic deformation role during castex process

where TiAl3 phase exhibits fine block structure and TiB2 particle is dispersed into α-Al matrix.Grain refining effects on the aluminum alloy with the prepared master alloy are greatly improved.The average grain size in the pure aluminum with 0.2% Al-5Ti-1B master alloy reaches 223 μm with holding for 5 min and 316 μm with holding for 180 min.