Effect of slow shot speed on externally solidified crystal,porosity and tensile property in a newly developed high-pressure die-cast Al-Si alloy

作     者：Wen-ning Liu Wei Zhang Peng-yue Wang Yi-xian Liu Xiang-yi Jiao Ao-xiang Wan Cheng-gang Wang Guo-dong Tong Shou-mei Xiong Wen-ning Liu;Wei Zhang;Peng-yue Wang;Yi-xian Liu;Xiang-yi Jiao;Ao-xiang Wan;Cheng-gang Wang;Guo-dong Tong;Shou-mei Xiong

作者机构：School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Key Laboratory for Advanced Materials Processing TechnologyTsinghua UniversityBeijing 100084Beijing China FAW Group Co.Ltd.Changchun 130013China China FAW Foundry Co.Ltd.Changchun 130013China 

出 版 物：《China Foundry》 (中国铸造（英文版）)

年 卷 期：2024年第21卷第1期

页      面：11-19页

核心收录：

学科分类：08[工学] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：financially supported by the National Key Research and Development Program of China(2022YFB3404201) the Major Science and Technology Project of Changchun City,Jilin Province(Grant No.20210301024GX)。 

主　　题：hypoeutectic Al-Si alloy high pressure die casting porosity externally solidified crystal tensile property 

摘      要：The effect of slow shot speed on externally solidified crystal(ESC),porosity and tensile property in a newly developed high-pressure die-cast Al-Si alloy was investigated by optical microscopy(OM),scanning electron microscopy(SEM)and laboratory computed tomography(CT).Results showed that the newly developed AlSi9MnMoV alloy exhibited improved mechanical properties when compared to the AlSi10MnMg alloy.The AlSi9MnMoV alloy,which was designed with trace multicomponent additions,displays a notable grain refining effect in comparison to the AlSi10MnMg alloy.Refining elements Ti,Zr,V,Nb,B promote heterogeneous nucleation and reduce the grain size of primaryα-Al.At a lower slow shot speed,the large ESCs are easier to form and gather,developing into the dendrite net and net-shrinkage.With an increase in slow shot speed,the size and number of ESCs and porosities significantly reduce.In addition,the distribution of ESCs is more dispersed and the net-shrinkage disappears.The tensile property is greatly improved by adopting a higher slow shot speed.The ultimate tensile strength is enhanced from 260.31 MPa to 290.31 MPa(increased by 11.52%),and the elongation is enhanced from 3.72%to 6.34%(increased by 70.52%).