Effects of cooling rates on microporosity in DC casting Al-Li alloy

作     者：Yu-xuan Zhang Jun-sheng Wang Dong-xu Chen Bing Wang Chi Zhang Zheng-an Wang Yu-xuan Zhang;Jun-sheng Wang;Dong-xu Chen;Bing Wang;Chi Zhang;Zheng-an Wang

作者机构：School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Advanced Research Institute of Multidisciplinary ScienceBeijing Institute of TechnologyBeijing 100081China Chinalco Southwest Aluminium(Group)Co.Ltd.Chongqing 401326China 

出 版 物：《China Foundry》 (中国铸造（英文版）)

年 卷 期：2022年第19卷第2期

页      面：177-190页

核心收录：

学科分类：0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China(Project number:52073030) 

主　　题：Al-Li alloys microporosity cooling rate XCT constitutive equation 

摘      要：During the direct chill(DC)casting process,primary cooling from the mold and bottom block,and secondary cooling from the waterjets produce a concave solid *** depth of this liquid pocket and mushy zone not only depends on the solidification range of the alloy but also the boundary conditions such as cooling ***-Li alloys solidify in a long solidification range increasing the susceptibility of porosity nucleation in the semi-solid *** this study,the effects of cooling rate on the porosity formation were quantified for the large ingot casting using X-ray computed tomography(XCT).By characterizing pore size distributions at four different cooling conditions,the correlation between the mechanical properties at both room and high temperatures and the microstructure features was *** constitutive equations were *** is found that increasing the cooling rate reduces the grain size,increases the number density of micropores,and minimizes the number of large pores,thereby improving the mechanical ***,long mushy zones and deep liquid pockets in Al-Li alloys can be effectively controlled by controlling the boundary conditions of the DC casting solidification process,thereby obtaining castings with excellent mechanical properties.