Abstract: Effect of extrusion ratio on microstructures, mechanical properties and electric resistivity of 6201 alloy wire were investigated. It is shown that when the extrusion ratio increases, under T6 heat treatment state, precipitation-hardening phases β′(Mg2Si) precipitate heavily and become smaller, meanwhile, the tensile strength, elongation and electric resistivity increase. However, this increase tendency becomes moderate with further increase of extrusion ratio. For a given extrusion ratio, mechanical properties of alloy wire decrease and conductivity increases with increase of on-line solution temperature and ageing temperature. Under the conditions that the extrusion ratio is 16.5-29.7, on-line solution temperature is 520-540 ℃ and ageing temperature is 150-160 ℃, the mechanical properties and electric resistivity are σb=310-328 MPa, δ=8.5%-10.3% and ρ=0.032 2-0.032 8 nΩ·m respectively. It is satisfied for the application of Al-Mg-Si conductor wire. So fine aluminum conductor wire can be produced by the proposed process and under proper extrusion ratio.
Effect of extrusion ratio on microstructures and properties of 6201 alloy wire produced by semisolid continuous extrusion
Abstract:
Effect of extrusion ratio on microstructures, mechanical properties and electric resistivity of 6201 alloy wire were investigated. It is shown that when the extrusion ratio increases, under T6 heat treatment state, precipitation-hardening phases β′(Mg2Si) precipitate heavily and become smaller, meanwhile, the tensile strength, elongation and electric resistivity increase. However, this increase tendency becomes moderate with further increase of extrusion ratio. For a given extrusion ratio, mechanical properties of alloy wire decrease and conductivity increases with increase of on-line solution temperature and ageing temperature. Under the conditions that the extrusion ratio is 16.529.7, on-line solution temperature is 520540 ℃ and ageing temperature is 150160 ℃, the mechanical properties and electric resistivity are σb=310328 MPa, δ=8.5%10.3% and ρ=0.032 20.032 8 nΩ·m respectively. It is satisfied for the application of Al-Mg-Si conductor wire. So fine aluminum conductor wire can be produced by the proposed process and under proper extrusion ratio.