多道次拉拔对Cu-1Ag合金微细丝线组织及性能研究

Study on Microstructure and Properties of Cu-1Ag Alloy Microwire in Multi-pass Drawing

采用三室真空熔炼气体保护冷型竖引连铸制备Cu-1Ag合金铸杆,通过多道次拉拔制备Cu-1Ag合金微细线。研究了应变对Cu-1Ag合金微细线的力学性能和导电性能变化规律。结果表明:ф7.8 mm铸杆具有连续纵向柱状晶组织,经多道次拉拔变为纤维状组织。Cu-1Ag合金的抗拉强度随着应变的增大而增大。当应变为11.93时,抗拉强度和电导率分别为963 MPa和92.8%IACS。其强度比纯Cu的抗拉强度提高了37.6%,而保持与纯Cu相近或相当的伸长率为2%。Cu-1Ag合金电导率随着应变的增大呈先减小后稳定的趋势,并建立了合金导电率与应变之间的关系。

Cu-lAg alloy casting rods were prepared by three chamber vacuum smelting gas shielded cold vertical continuous casting and Cu-lAg alloy micro-wires were prepared by multi-pass drawing.The variation of mechanical and electrical properties of micro-wires of Cu-lAg alloy with strain were studied.The results show that theφ7.8 mm with continuous casting rod longitudinal columnar crystal structure,which becomes a fibrous structure in multi-pass drawing.The tensile strength of Cu-lAg alloy increases with increasing strain.When the strain is 11.93,the tensile strength and conductivity are 963 MPa and 92.8%IACS,respectively.Its tensile strength is 37.6%higher than that of pure Cu,while its elongation is 2%,which is similar or equivalent to that of pure Cu.The conductivity of Cu-lAG alloy decreased first and then stabilized with the increase of strain,and the relationship between the conductivity and strain is established.