Enhanced grain refinement of Al-Si alloys by novel Al-V-B refiners

作     者：Chenxi Zhao Yang Li Jin Xu Qun Luo Ying Jiang Qiling Xiao Qian Li Chenxi Zhao;Yang Li;Jin Xu;Qun Luo;Ying Jiang;Qiling Xiao;Qian Li

作者机构：State Key Laboratory of Advanced Special SteelsShanghai Key Laboratory of Advanced FerrometallurgySchool of Materials Science and EngineeringShanghai UniversityShanghai 200444China Materials Genome InstituteShanghai UniversityShanghai 200444China 

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

年 卷 期：2021年第94卷第35期

页      面：104-112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：financially supported by the National Natural Science Foundation of China(No.51871138) the Science and Technology Commission of Shanghai Municipality(No.19010500400) the"111"projects(No.D16002) 

主　　题：Al-Si alloys Grain refinement Al-V-B Interfacial structure Thermodynamic calculation 

摘      要：Al-V-B master alloy is promising for refining Al-Si alloys,yet its optimal composition with superior efficacy remains to be *** this work,the evolution of refining phases in the Al-10 Si/Al-V-B system with different V:B ratios was evaluated by thermodynamic calculations,based on which the Al-V-B refiners with V:B=1:1 and 5:1 were *** trails demonstrated that they could significantly reduce the grain size of Al-10 Si(wt.%)alloy from 1736 to 184-245μm with industrial addition *** examinations results clarify that when V:B ratio is 1:1 the nucleation particle is(V,Al)B_(2),which has a VB_(2)-AlB_(2) core-shell structure and therefore presents the nucleation capability as AlB_(2) *** V:B ratio is as high as 5:1,the nucleation particle is pure VB_(2).Density functional theory(DFT)calculation indicates that(0001)VB_(2)/(111)α-Al interface has the lowest interfacial energy such that highest nucleation potency among other types of diboride/α-Al interfaces under *** outcomes of this work provide fundamental guidance to develop superior V-B based refiners for Al-Si alloys.