Study on microstructure and properties of continuous extrusion wire of Cu-Cr-Zr alloy
The constitutive equation of Cu-Cr-Zr alloy was established by hot compression experiments.The effects of die size and extru-sion rotate speed on the continuous extrusion deformation process of Cu-Cr-Zr alloy were analyzed by finite element simulation software DE-FORM-3D.The microstructure and mechanical properties of the continuous extrusion products were analyzed by scanning electron micro-scope(SEM),electron back-scattered diffraction(EBSD),and mechanical properties experiments.The results show that the die size of 5 mm×10 mm has higher deformation temperature,effective strain and extrusion wheel torque than that of the die size of 6 mm×8.4 mm.The extrusion rotate speed of 10 r·min-1 has higher deformation temperature,effective strain and extrusion wheel torque than that of the extrusion rotate speed of 7 r·min-1.The continuous extrusion deformation significantly refines the grain size of Cu-Cr-Zr alloy.When the die size is 5 mm×10 mm and the extrusion rotate speed is 7 and 10 r·min-1,the average grain size is refined from 2 mm to 0.77 and 0.54 μm,respectively.When the die size is 6 mm×8.4 mm and the extrusion rotate speed was 7 and 10 r·min-1,the average grain size is refined from 2 mm as cast to 0.52 and 0.40 μm,respectively.The continuous extrusion deformation significantly improves the mechan-ical properties of Cu-Cr-Zr alloy.When the die size is 5 mmx10 mm and the extrusion rotate speed is 7 r·min-1,the tensile strength of the product reaches the highest 530.75 MPa,which is 98.3％higher than that of the as-cast billet.
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