Nucleation and growth of Fe-rich phases in Al-5Ti-1B modified Al-Fe alloys investigated using synchrotron X-ray imaging and electron microscopy

作     者：Yuliang Zhao Weiwen Zhang Dongfu Song Bo Lin Fanghua Shen Donghai Zheng ChunXiao Xie Zhenzhong Sun Yanan Fu Runxia Li Yuliang Zhao;Weiwen Zhang;Dongfu Song;Bo Lin;Fanghua Shen;Donghai Zheng;ChunXiao Xie;Zhenzhong Sun;Yanan Fu;Runxia Li

作者机构：Neutron Scattering Technical Engineering Research CentreSchool of Mechanical EngineeringDongguan University of TechnologyDongguan523808China Guangdong-Hong Kong-Macao Joint Laboratory for Neutron Scattering Science and TechnologyDongguan University of TechnologyDongguan523808China National Engineering Research Centre of Near-net-shape Forming for Metallic MaterialsSouth China University of TechnologyGuangzhou510641China Guangdong Institute of Materials and ProcessingGuangdong Acadamy of ScienceGuangzhou510650China School of Mechanical EngineeringGuizhou UniversityGuiyang550025China Shanghai Synchrotron Radiation Facility.Shanghai Advanced Research InstituteCASShanghai201204China School of Materials Science and EngineeringDongguan University of TechnologyDongguan523808China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2021年第80卷第21期

页      面：84-99页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the Team Project Natural Science Foundation of Guangdong Province(2015A030312003) Basic and Applied Basic Foundation of Guangdong Province(2019A1515110270) Research start-up funds of DGUT(GC300501138) Scientific Research Foundation of Advanced Talents(Innovation Team)DGUT(No.KCYCXPT2016004 and No.TDQN2019005) Natural Science Foundation of China(52074131) 

主　　题：Al alloys Synchrotron X-ray imaging Fe-rich phases Grain refinement Nucleation and growth 

摘      要：Plate-like Fe-rich intermetallic phases directly influence the mechanical properties of recycled Al alloys;thus, many attempts have been made to modify the morphology of these phases. Through synchrotron X-ray imaging and electron microscopy, the underlying nucleation and growth mechanisms of Fe-rich phases during the solidification of Al-5 Ti-1 B-modified Al-2 Fe alloys were revealed in this study. The results showed that the Al-5 Ti-1 B grain refiner as well as the applied pressure both resulted in reduction of the size and number of primary Al_(3)Fe phases and promoted the formation of eutectic Al_(6)Fe *** tomography results demonstrated that Al-5 Ti-1 B changed the three-dimensional(3 D) morphology of primary Fe-rich phases from rod-like to branched plate-like, while a reduction in their thickness and size was also observed. This was attributed to the fact that Ti-containing solutes in the melts inhibit the diffusion of Fe atoms and the Al_(3)Fe twins produce re-entrant corner on the twin boundaries along the growth direction. Moreover, the TiB_(2) provides possible nucleation sites for Al_6Fe phases. The nucleation mechanism of Fe-rich phases is discussed in terms of experimental observations and crystallography calculations. The decrease in the lattice mismatch between TiB_(2) and Al_(6)Fe phases was suggested, which promoted the transformation of Al_(3)Fe to Al_(6)Fe phases.