Study on the Microstructure Formation Mechanism and Fracture Behaviour of Laser-Welded Be-Al Alloy AITranslate

Basic Information:

DOI：

Chinese Library Classification Number:TG401[金属学及工艺]

Citation Information:

To meet the high weld depth and high-performance welding technology requirements of Be-Al alloy,the effects of different laser powers on the microstructure,tensile properties,and fracture behavior of Be-Al alloy were investigated.The results show that when the laser power is low(800 W),the weld seam exhibits a crescent shape,with a weld depth of only 0.5 mm.As the laser power increases,the weld depth significantly increases,but a banded Al phase is formed in local areas of the weld seam.Excessive heat input leads to the widening of the banded Al phase,resulting in debonding and cracking at the Be-Al interface.When the laser power increases to 1200 W,the presence of microcracks and oxide inclusions at the Be-Al interface causes the fracture to ultimately occur in the weld seam.With a laser power of 1000 W,laser welding technology can achieve high-strength welding of Be-Al alloy with a certain depth(approximately 0.9 mm),and the tensile strength reaches above 300 MPa.