Effect of intergranular segregation on tensile fracture behavior and deformation mechanism of CuSn10P1 alloy
Unidirectional tensile tests were carried out on CuSn10P1 alloys with two different intergranular segregation degrees at room temperature and stretching velocity of 1 mm·min-1.The results show that the tensile strength and elongation after fracture of semi-solid alloy are increased by 30.7%and 378.7%than those of liquid alloy,respectively.Cracks in both materials extend along the intergranular and α-phase high Sn transition layer during tension process,but the semi-solid CuSn10P1 alloy has superior mechanical properties.This is mainly attributed to that the semi-solid CuSn10P1 alloy has less intergranular structure,finer grain size and higher solid solubility of Sn element.After fracture,deformed twins are found in the region of α-phase high Sn transition layer of the semi-solid CuSn10P1 alloy,indi-cating a shift in the deformation mechanism from slip mechanism to twinning mechanism.
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