Effect of Hot Rolling+Electric Pulse on Microstructure and Properties of Cu-14Sn-0.3Ti Alloy for Superconducting
The strength and elongation of Cu-14Sn-0.3Ti alloy were improved synergistically by hot rolling+electric pulse treatment.The influence of deformation energy storage and pulse current on reduction of stacking faults and twin growth was investigated by adjusting hot rolling and electric pulse processing.The results show that the elongation of Cu-14Sn-0.3Ti alloy increases from 4.7％to 40％,and the strength increases from 298 MPa to 530 MPa after 70％hot rolling+10 min electric pulse treatment.The strength and density of Cu-14Sn-0.3Ti alloy increase with the increase in deformation energy storage.The δ phase dissolves,and the deformation-induced stacking faults are reduced because of the synergetic effect of Joule heat and electron wind.After electric pulse treatment,the formation of twins provides additional slip systems for the movement of dislocations and improves the elongation of Cu-14Sn-0.3Ti alloy.On the one hand,the appearance of twins divides and refines the grains.On the other hand,the formation of twin boundaries hinders the movement of dislocations during the deformation of Cu-14Sn-0.3Ti alloy,improving the strength of Cu-14Sn-0.3Ti alloy.
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