Effect of refining processes on inclusions and mechanical properties of cast Al-2Li-2Cu-0.2Zr alloy

作     者：Mian RONG Liang ZHANG Guo-hua WU Wei-wei LI Xiao-long ZHANG Jiang-wei SUN Wen-jiang DING 荣冕;张亮;吴国华;李炜炜;张小龙;孙江伟;丁文江

作者机构：National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix CompositesSchool of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Mag (Kunshan) New Material Technology Co.Ltd.Kunshan 215300China 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2019年第29卷第7期

页      面：1375-1382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：Project(2016YFB0301003)supported by the National Key R&D Program of China Project(51871148)supported by the National Natural Science Foundation of China Project(sklmmc-kf18-02)supported by Open Research Fund of the State Key Laboratory of Metal Matrix Composites,China 

主　　题：Al-Li-Cu-Zr alloy refining process microstructure melt purity mechanical properties 

摘      要：The effect of different refining processes on inclusions and mechanical properties of cast Al-2Li-2Cu-0.2Zr alloy was investigated, including two-stage hexachloroethane (C2Cl6) refining process, two-stage rotating gas bubbling refining process and two-stage composite refining process. It was found that the two-stage composite refining process, which combined C2Cl6 and rotating gas bubbling, can significantly improve the melt purity and mechanical properties of cast Al-2Li-2Cu-0.2Zr alloy. Compared to the unrefined alloy, the volume fraction of gas porosity defects and slag inclusions decreased from 1.47% to 0.12%, and the yield strength, ultimate tensile strength and elongation of as-quenched alloy increased from 113 MPa,179 MPa and 3.9% to 142 MPa, 293 MPa and 18.1%, respectively. C2Cl6 was first utilized to degas and remove large size slag inclusions before lithium addition, and then the rotating gas bubbling was utilized to do the further degassing and remove the suspended fine inclusions after lithium addition. The two-stage composite refining process can take advantage of two methods and get the remarkable refining effect.