Journal
MATERIALS TODAY COMMUNICATIONS
Volume 29, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.mtcomm.2021.102835
Keywords
Spray formed 7055 aluminum alloy; Ceramic particles; TIG welded joint; Ductile fracture
Categories
Funding
- Graduate Research and Innovation Projects of Jiangsu Province (CN) [KYCX20_3098]
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This study developed aluminum alloy welding wires containing TiB2 and ZrB2 ceramic particles, successfully introducing them into the welded joints of spray formed 7055 aluminum alloy to improve the strength and ductility of the joints, providing new possibilities for the application of aluminum alloys.
Spray formed 7055 high strength aluminum alloy welded joint with traditional aluminum alloy welding wires has low strength, only 240-260 MPa, and high brittleness, which seriously restricts the widespread application of spray formed 7055 high strength aluminum alloy. In this paper, two kinds of aluminum alloy welding wires containing TiB2 and ZrB2 ceramic particles were developed, and TiB2 and ZrB2 ceramic particles were introduced into the welded joint of the spray formed 7055 aluminum alloy by TIG welding, respectively. The results show that the microstructures of TiB2-7055 welded joint is fine equiaxed grains, and the tensile strength of is 310 MPa, reaching 51.6% strength of the base metal. Moreover, the elongation is more than 5%, demonstrating ductile fracture. The microstructure of ZrB2-7055 welded joint is fine dendrite, and the tensile strength is 280 MPa, reaching 46.6% strength of the base metal, showing brittle fracture. The development of this new type of welding wire containing TiB2 ceramic particles can solve the problems of softening and low plasticity of spray formed 7055 high strength aluminum alloy fusion welded joint, and provide the basis for expanding the applications of spray formed 7055 high strength aluminum alloy in the fields requiring both lightweight and high strength.
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