退火及变形工艺对5056铝合金丝材组织性能的影响

Effect of annealing and cold deformation on microstructure and properties of 5056 aluminum alloy wire

研究了中间退火、冷轧变形量以及成品退火对5056铝合金丝材组织和性能的影响。结果表明:Φ1.1 mm的5056铝合金圆丝经85%的轧制变形和400℃2 h中间退火后,组织发生了完全再结晶,晶粒形貌由拉长状转变为等轴状,丝材强度明显下降,抗拉强度由423 MPa降低至376 MPa,降低了11%。随着冷轧变形量增大,丝材强度逐渐升高,当变形量由79%提高至87%,抗拉强度由420 MPa升高到432 MPa,屈服强度由382 MPa升高到388 MPa。随着成品退火温度升高,成品丝材强度逐渐降低;当退火温度低于120℃时,丝材抗拉强度不小于400 MPa。

The effects of intermediate annealing,cold rolling deformation and finished annealing on the microstructure and properties of 5056 aluminum alloy round wire were studied.The results show that after 85%rolling deformation and intermediate annealing at 400℃2 h onφ1.1 mm 5056 aluminum alloy round wire,the microstructure is completely recrystallized,the grain morphology changes from fibrous to equiaxed,the strength of the wire decreases obviously,and the tensile strength decreases from 423 MPa to 376 MPa,by 11%.The strength of wire gradually increases with the increase of cold deformation.When the deformation is increased from 79%to 87%,the tensile strength can go up to 420 MPa from 432 MPa,and the yield strength rises from 382 MPa to 388 MPa.With the increase of annealing temperature,the strength of finished wire decreases gradually.When the annealing temperature is lower than 120℃,the tensile strength of wire is 400 MPa and over.