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

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【作者】 徐聪； 肖文龙； 赵卫涛； 王文红； 花田修治； 山县裕； 马朝利；

【Author】 XU Cong;XIAO Wenlong;ZHAO Weitao;WANG Wenhong;Shuji Hanada;Hiroshi Yamagata;MA Chaoli;Key Laboratory of Aerospace Advanced Materials and Performance of Ministry of Education, School of Materials Science and Engineering, Beihang University;Hebei Sitong New Metal Material Co., Ltd.;Institute for Materials Research, Tohoku University;Center for Advanced Die Engineering and Technology, Gifu University, 1-1 Yanagido;

【机构】 Key Laboratory of Aerospace Advanced Materials and Performance of Ministry of Education, School of Materials Science and Engineering, Beihang University； Hebei Sitong New Metal Material Co., Ltd.； Institute for Materials Research, Tohoku University； Center for Advanced Die Engineering and Technology, Gifu University, 1-1 Yanagido；

【摘要】 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 Ti Al3/Ti2Al20 RE core-shell structured primary particles, and the size of Ti Al3 core decreased, while the thickness of Ti2Al20 RE 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 Ti Al3/Ti2Al20 RE core-shell structured primary particles and insoluble Ti C nuclei formed in α-Al matrix. The formation mechanism of core-shell structure was further investigated based on Ginstling-Brounstein model.

【Abstract】 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 Ti Al3/Ti2Al20 RE core-shell structured primary particles, and the size of Ti Al3 core decreased, while the thickness of Ti2Al20 RE 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 Ti Al3/Ti2Al20 RE core-shell structured primary particles and insoluble Ti C nuclei formed in α-Al matrix. The formation mechanism of core-shell structure was further investigated based on Ginstling-Brounstein model.

【关键词】 Al-Ti-C-RE； core-shell structure； grain refinement； formation mechanism； rare earths；
【Key words】 Al-Ti-C-RE； core-shell structure； grain refinement； formation mechanism； rare earths；
【基金】 Project supported by National High Technology Research and Development Program of China(2013AA031001);the National Basic Research Program of China(2012CB619503);International Science&Technology Cooperation Program of China(2012DFA50630)
  • 【文献出处】 Journal of Rare Earths ,稀土学报(英文版) , 编辑部邮箱 ,2015年05期
  • 【分类号】TG146.21
  • 【被引频次】19
  • 【下载频次】89
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