首页|Effect of alloying elements Cu and Ni on mechanical properties of steel/aluminum laser welded joints
Effect of alloying elements Cu and Ni on mechanical properties of steel/aluminum laser welded joints
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NSTL
Elsevier
In order to enhance the strength of steel / aluminum welded joints, the alloying effect of Cu and Ni on the Fe / Al interface was studied by establishing the Fe/Al interface model by using the first principle method of density functional theory. The energy, heat of formation, density of states, electron population and fracture energy of the system were calculated. On this basis, the experiments of steel/aluminum laser welding with preset Cu and Ni foil were carried out. The results show that Cu and Ni preferentially replace the Fe atoms in the Fe/Al interface, and the stability of the alloy system increases. Alloying improves the bonding electron number and electron transfer number of the Fe/Al interface system, enhances the bonding effect of the Fe/Al interface, and improves the bonding strength of the Fe/Al interface. Among them, nickel can significantly increase the bonding strength of Fe/Al interface. At the same time, the tensile test shows that the average tensile strength of steel/aluminum welded joint is 39 MPa and the elongation is 0.81%. After adding copper foil, the average tensile strength and elongation of welded joints increased by 38.5% and 113.58%. After adding nickel foil, the average tensile strength and elongation of welded joints increased by 100% and 179%. The alloying effect of Ni greatly improves the strength and toughness of steel/aluminum welded joints. It provides practical reference and theoretical guidance for steel/aluminum welding.
First principleSteelaluminumAlloyingMechanical propertiesMICROSTRUCTURESTEELALUMINUMPARAMETERSINTERFACESTABILITY
Shi Yaochen、Li Zeqi、Yin Chunmei、Yu Xuelian、Kou Ying
NSTL
Elsevier
