The additive friction stir deposition(AFSD)experiment of 2219 aluminum alloy was conducted under the process parameters of the spindle rotational speed of 250-350 r/min and transverse speed of 50-150 mm/min,the effects of varying process parameters and multilayer thermal cycling on the macroscopic forming of deposited materials,microstructures and mechanical properties were investigated. The results show that well-formed single-pass 16-layer additive specimens can be successfully obtained under the process parameters of the spindle rotational speed of 250 r/min and the traverse speed of 100 mm/min. The grain size in the additive zone undergoes significant refinement,ranging from 4 to 6 μm,and the fine equiaxial crystal organization replaces the coarse irregular grain organization characteristic of the feed rod. The additive specimen undergoes intense dynamic recrystallization,with overall recrystallized grains above 80%,and the bottom of the specimen(the 1st Layer)is subjected to multiple thermal cycles,with recrystallized grains reaching 91.8%. The texture of the additive zone basically consists of four recrystallized textures(Cube,Copper,P and RtB),as well as S,Brass and T textures. Significant softening of the hardness and tensile strength of the additive specimens occurs. The maximum hardness of the 16th layer is 80HV,which is about 55.6% of the base material of the feed rod,the hardness of the 1st-8th layers is uniformly 60HV. The average tensile strength of Layer 9-16 and 1-8 in the LD(longitudinal direction)direction of the additive zone is 243.0 MPa and 219.3 MPa respectively,which is about 60.0% and 52.9% of the base material,the average elongation is 19.4% and 24.5%,which is about 181.1% and 229.0% of the base material respectively. The fracture modes in the LD direction of the additive specimens are all ductile fracture.


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    Title :

    Microstructure and properties of 2219 aluminum alloy fabricated via additive friction stir deposition


    Contributors:
    WANG Ruilin (author) / YANG Xinqi (author) / TANG Wenshen (author) / LUO Ting (author) / ZHAO Yaobang (author) / DOU Enhui (author)


    Publication date :

    2024




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    Unknown