Microstructure and mechanical properties of a new Al–Zn–Mg–Cu alloy joints welded by laser beam

Comparison of microstructure and mechanical properties of TIG and laser welding joints of a new Al–Zn–Mg–Cu alloy

“…5a, it can be seen that the peak temperature of welding thermal cycles of laser joint drops more quickly. As a result, a narrower HAZ is generated because the width of HAZ is mainly decided by the peak temperature in Al-Zn-Mg-(Cu) alloy welding [24][25][26][27]. And this can be attributed to the lower heat input of laser welding, see Section 2.…”

“…Moreover, the microhardness in FZ and part of HAZ in the two joints increases distinctly within 90 days after welding due to natural aging. And the distribution of the four hardness profiles is almost the same, that is the minimum microhardness is obtained in FZ, then the microhardness increases rapidly to a higher level in the HAZ adjacent to FZ, and this region could be called the dissolution zone where the peak temperature of welding thermal cycle exceeds the fully dissolve temperature of η′ and η phases, the η′ phases existing in BM dissolve during welding and the matrix is supersaturated, then GPI zones dissolve out in the cooling stage and subsequent time; besides, in the other region of HAZ that could be named the overaging zone, the peak temperature of welding thermal cycle exceeds the transformation temperature of η′ to η phase that may also be named softening temperature, the η phases begin to emerge and cause severe softening [24][25][26][27].…”

The Effect of Process Parameters on the Microstructure and Mechanical Performance of Fiber Laser-Welded AA5182 Aluminium Alloys

“…Wang et al [15] stated that the solidification duration of the molten pool is the key factor for porosity. Zhang et al [16] evaluated the microstructural and mechanical properties of the laser welded new type of Al-Zn-Mg-Cu alloy sheets. They stated that the ultimate tensile strength of the joint was 69.7% of that of the base material tensile strength and those samples of the tensile tests were always fractured at the weld bead.…”

Hot deformation behavior and processing map of a new type Al-Zn-Mg-Er-Zr alloy

“…A novel Al-Zn-Mg alloy with Er and Zr additions has been developed by Nie and his colleagues [7][8][9][10], who have focused on the relevant research of micro-alloying for aluminum alloy. The new type Al-Zn-Mg-Er-Zr alloy exhibits an excellent comprehensive performance, such as strength, weldability [7,8], recrystallization resistance [10] and etc., which should be attributed to the presence of L1 2 -structured Al 3 (Er,Zr) nanoparticles.…”

“…The new type Al-Zn-Mg-Er-Zr alloy exhibits an excellent comprehensive performance, such as strength, weldability [7,8], recrystallization resistance [10] and etc., which should be attributed to the presence of L1 2 -structured Al 3 (Er,Zr) nanoparticles. The relatively complex alloying elements and their high content result in the high strength of the Al-Zn-Mg-Er-Zr alloy.…”