Effects of Deformation on the Microstructure and Properties of Semi-solid CuSn10 Alloys
The effect of deformation on the microstructure and properties of semi-solid CuSnq10 alloy was investigated.Semi-solid CuSn10 slurry was made by a self-developed enclosed cooling slope channel(ECSC)and cast into thin plates by rheological squeeze,and then rolled at 350 ℃.The results show that as deformation increases,casting defects such as shrinkage porosity and shrinkage cavities gradually decrease,with grains compressed and elongated,and their average thickness is reduced from 30.58 μm(undeformed)to 22.12 μm(ε=0.4).In addition,more deformation twins are found inside the primary phase with increasing deformation.As deformation increases from 0 to 0.4,a large amount of substructures and dislocation density are introduced into the CuSn 10 alloy microstructure.At ε=0.4,textures[101],[111],and[001]are found in pole figures {110} and {111}.The mechanical properties of the plate increase,including yield strength,tensile strength,and hardness.At the deformation of 0.4,the yield strength,tensile strength and hardness reach 443 MPa,554 MPa,and 1901.2 MPa,increased by 106.1％,66.4％,and 41.6％,compared with those without deformation,respectively.But the plasticity of the plate is declined,and its elongation decreases to 0.82％.The changes in the alloy are mainly attributed to work hardening and refined grains produced during the rolling deformation.
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