Influence of introducing Zr,Ti,Nb and Ce elements on externally solidified crystals and mechanical properties of high-pressure die-casting Al–Si alloy  

作　　者：Junjie Li Wenbo Yu Zhenyu Sun Weichen Zheng Liangwei Zhang Yanling Xue Wenning Liu Shoumei Xiong 

机构地区：[1]Center of Materials Science and Engineering,School of Mechanical and Electronic Control Engineering,Beijing Jiaotong University,Beijing 100044,China [2]Traffic&Transportation Engineering,Central South University,Changsha 410075,China [3]Shanghai Synchrotron Radiation Facility,Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201204,China [4]School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2025年第1期147-153,共7页矿物冶金与材料学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.52175284 and 52474396);the National Key Research and Development Program of China(No.2022YFB3404201)。

摘　　要：High pressure die casting(HPDC)AlSi10Mn Mg alloy castings are widely used in the automobile industry.Mg can optimize the mechanical properties of castings through heat treatment,while the release of thermal stress arouses the deformation of large integrated die-castings.Herein,the development of non-heat treatment Al alloys is becoming the hot topic.In addition,HPDC contains externally solidified crystals(ESCs),which are detrimental to the mechanical properties of castings.To achieve high strength and toughness of non-heat treatment die-casting Al-Si alloy,we used AlSi9Mn alloy as matrix with the introduction of Zr,Ti,Nb,and Ce.Their influences on ESCs and mechanical properties were systematically investigated through three-dimensional reconstruction and thermodynamic simulation.Our results reveal that the addition of Ti increased ESCs'size and porosity,while the introduction of Nb refined ESCs and decreased porosity.Meanwhile,large-sized Al_3(Zr,Ti)phases formed and degraded the mechanical properties.Subsequent introduction of Ce resulted in the poisoning effect and reduced mechanical properties.

关 键 词：aluminium alloy high-pressure die-casting externally solidified crystals non-heat treatment 

分 类 号：TG146.21[一般工业技术—材料科学与工程]