形变热处理对Cu-Ag-Cr和Cu-Ag-Zr合金组织和性能的影响

采用中频熔炼-铁模铸造-热轧-固溶-冷轧-时效处理工艺，制备了Cu—Ag-Cr和Cu—Ag-Zr两种合金板材。通过拉伸力学性能测试、电导率测试、金相和透射电子显微镜观察，研究了固溶-预冷变形-时效对加入微量Cr、Zr的Cu—Ag合金组织和性能的影响。结果表明：在Cu—Ag合金中添加微量Cr和Zr，能显著地提高铜银合金的力学性能，添加Cr时，电导率有-定降低，而添加Zr时，电导率没有明显变化；两种合金较好的形变热处理工艺为时效前进行30％冷变形，然后在450℃下时效4h，在此工艺条件下Cu—Ag-Cr合金的抗拉强度、伸长率、相对电导率分别为397MPa、16．8％和78％IACS，Cu—Ag-Zr合金的抗拉强度、伸长率、相对电导率分别为373MPa、10％和96％IACS；形变热处理能够显著提高研究合金的力学性能而不明显降低电导率，微量Cr、Zr以Cr单质和Cu3Zr粒子的形式在基体中弥散析出，是合金强度提高的主要原因，而纯铜的基体仍使其具有较高的电导率。

Influence of thermo-mechanical processing on microstructure and mechanical properties of Cu-Ag-Cr and Cu-Ag-Zr alloys

Cu-Ag-Cr and Cu-Ag-Zr alloy plates were prepared.The influence of trace Cr and Zr on the microstructure and mechanical properties of Cu-Ag was studied by means of tensile test, optical microscopy and transmission electron microscopy. The results show that adding trace Cr and Zr to Cu-Ag alloy can greatly increase the strength of the alloy and remain the electrical conductivity at high level. After optimized thermo-mechanical processing, the tensile strength, elongation and relative electrical conductivity of Cu-Ag-Cr alloy can reach 397MPa, 16.8% and 78%IACS,and the tensile strength, elongation and relative electrical conductivity of Cu-Ag-Zr alloy can reach 373MPa, 10% and 96%IACS,respectively.