Effect of rotation speed on microstructure and properties of 2219 aluminum alloy manufactured by additive friction stir deposition
Using additive friction stir deposition(AFSD),2219 aluminum alloy pieces were created for this paper.At three distinct rotational speeds of 200,300 and 400 r/min,the microstructure and mechanical properties of 2219-AFSD alloy were examined.The results show that the microstructure of 2219-AFSD alloy is comparatively uniform and devoid of visible microstructure flaws compared to the feedstock.Because of friction heat and plastic deformation,dynamic recrystallization occurs,resulting in clearly refined grains in the alloy.The higher the temperature during the deposition process,the larger the grain size of the 2219-AFSD alloy,and the greater the driving force for the redissolution of the second phase,resulting in the redissolution of the precipitation-strengthening phase into the matrix and the reduction in the size and quantity of the θ phase.The ultimate tensile strength of 2219-AFSD alloy falls between 265.6 MPa to 312.5 MPa,approximately 58%to 68%of the feedstock.The elongation of 2219-AFSD alloy is superior to that of the feedstock,which increases to 278%-294%of that of the feedstock.Furthermore,the rotational speed is a positive correlation with the grain size and ultimate tensile strength and adverse relationship with elongation at break.
additive friction stir deposition2219 Al alloygrainmicrostructuremechanical property
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