Microstructure and formation mechanism of grain-refining particles in Al-Ti-C-RE grain refiners

The Al-5Ti-0.2C-based grain refiners with different contents of rare earth （RE） were successfully prepared via powder metallurgy and vacuum casting. The microstructural evolution has been studied by X-ray diffraction （XRD）, differential scanning calorimetry （DSC）, scanning electron microscopy （SEM）...

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Published inJournal of Rare Earths Vol. 33; no. 5; pp. 553 - 560
Main Author 徐聪 肖文龙 赵卫涛 王文红 花田修治 山县裕 马朝利
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.05.2015
Elsevier BV
Subjects
Al-Ti-C-RE
Aluminum
core-shell structure
formation mechanism
Formations
Grain refinement
Intermetallic compounds
Intermetallics
Microstructure
Rare earth metals
rare earths
Scanning electron microscopy
TiAl3
Titanium aluminides
壳结构
形成机理
扫描电子显微镜
晶粒细化剂
稀土含量
透射电子显微镜
颗粒
Al-Ti-C-RE
grain refinement
formation mechanism
core-shell structure
rare earths
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Summary:The Al-5Ti-0.2C-based grain refiners with different contents of rare earth （RE） were successfully prepared via powder metallurgy and vacuum casting. The microstructural evolution has been studied by X-ray diffraction （XRD）, differential scanning calorimetry （DSC）, scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. The results showed that the RE addition resulted in the formation of TiAl3/Ti2Al20RE core-shell structured primary particles, and the size of TiAl3 core decreased, while the thickness of Ti2Al20RE increased with increase of RE contents. As compared to Al-5Ti-0.2C grain refiner, the grain refining efficiency was gradually improved with increase of RE contents, which was mainly attributed to the TiAl3/Ti2Al20RE core-shell structured primary particles and insoluble TiC nuclei formed inα-Al matrix. The formation mechanism of core-shell structure was further investigated based on Ginstling-Brounstein model.
Bibliography:XU Cong,XIAO Wenlong,ZHAO Weitao,WANG Wenhong,Shuji Hanada,Hiroshi Yamagata,MA Chaoli
Al-Ti-C-RE; core-shell structure; grain refinement; formation mechanism; rare earths
11-2788/TF
The Al-5Ti-0.2C-based grain refiners with different contents of rare earth （RE） were successfully prepared via powder metallurgy and vacuum casting. The microstructural evolution has been studied by X-ray diffraction （XRD）, differential scanning calorimetry （DSC）, scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. The results showed that the RE addition resulted in the formation of TiAl3/Ti2Al20RE core-shell structured primary particles, and the size of TiAl3 core decreased, while the thickness of Ti2Al20RE increased with increase of RE contents. As compared to Al-5Ti-0.2C grain refiner, the grain refining efficiency was gradually improved with increase of RE contents, which was mainly attributed to the TiAl3/Ti2Al20RE core-shell structured primary particles and insoluble TiC nuclei formed inα-Al matrix. The formation mechanism of core-shell structure was further investigated based on Ginstling-Brounstein model.
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1002-0721
2509-4963
DOI:10.1016/s1002-0721(14)60455-5