(昆明贵金属研究所 第二研究室， 昆明 650221)
摘 要: 制备了Cu-10Ag和Cu-10Ag-0.05Ce合金，其铸态结构由Ag沉淀、（Cu＋Ag）共晶和Cu基体组成。 采用大变形法制备了两合金的原位纳米纤维复合材料。研究了大变形（真应变ε≥9）合金和时效态合金的结构与性能, 观察了Ag沉淀过程。 结果表明微量Ce添加剂细化Ag纤维尺寸， 提高再结晶温度和不连续沉淀的温度， 明显提高形变态、 时效态和完全退火态Cu-10Ag合金的拉伸强度，而保持与Cu-10Ag合金相近或相当的导电率。 真实应变ε=9.9的大变形Cu-10Ag和Cu-10Ag-0.05Ce合金的抗拉强度分别为1 190和1 430 MPa， 导电率分别为68.7％和67.6％IACS，这些性能在低于300 °C是稳定的。
关键字: 原位复合材料； Cu-Ag合金； Ce； 沉淀； 拉伸强度；导电率
in situ filamentary composites
（ Kunming Institute of Precious Metals, Kunming 650221, China）
Abstract: The Cu-10Ag and Cu-10Ag-0.05Ce alloys were prepared. The microstructures of the cast alloys consist of Ag precipitate, (Cu+Ag) eutectic and Cu matrix. The Cu-10Ag and Cu-10Ag-0.05Ce alloys in situ nanofilamentary composites were also prepared by the heavy deformation. The structure and properties of the alloys heavy deformed with the true strain ε≥9 and aged at different temperatures were studied. The results indicate that the Cu-10Ag-0.05Ce alloy possesses much higher tensile strength and recrystallization temperature than Cu-10Ag alloy, with similar electrical conductivity to that of the Cu-10Ag alloy. The tensile strength and the electrical conductivity of the heavy deformed Cu-10Ag and Cu-10Ag-0.05Ce alloys with true strain ε=9.9 are 1 190 and 1 430 MPa, and 68.7% and 67.6%IACS, respectively. The properties are increased to a certain extent in the aging process at temperatures below 300 °C for both Cu-10Ag and Cu-10Ag-0.05Ce alloys.
Key words: in situ composite; Cu-Ag alloy; Ce; precipitation; tensile strength; conductivity
