(昆明貴金屬研究所 第二研究室， 昆明 650221)
摘 要: 制備了Cu-10Ag和Cu-10Ag-0.05Ce合金，其鑄態(tài)結構由Ag沉淀、（Cu＋Ag）共晶和Cu基體組成。 采用大變形法制備了兩合金的原位納米纖維復合材料。研究了大變形（真應變ε≥9）合金和時效態(tài)合金的結構與性能, 觀察了Ag沉淀過程。 結果表明微量Ce添加劑細化Ag纖維尺寸， 提高再結晶溫度和不連續(xù)沉淀的溫度， 明顯提高形變態(tài)、 時效態(tài)和完全退火態(tài)Cu-10Ag合金的拉伸強度，而保持與Cu-10Ag合金相近或相當的導電率。 真實應變ε=9.9的大變形Cu-10Ag和Cu-10Ag-0.05Ce合金的抗拉強度分別為1 190和1 430 MPa， 導電率分別為68.7％和67.6％IACS，這些性能在低于300 °C是穩(wěn)定的。
關鍵字: 原位復合材料； Cu-Ag合金； Ce； 沉淀； 拉伸強度；導電率
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
