(1. 河南科技大學 材料科學與工程學院，洛陽471003;
2. 河南科技大學 河南省有色金屬材料科學與加工技術重點實驗室，洛陽 471039)
摘 要: 采用真空熔鑄與形變相結(jié)合的方法制備高強高導Cu-Cr-Zr原位復合材料，利用SEM和TEM分析材料在鑄態(tài)及變形態(tài)的顯微組織，研究不同變形量和中間熱處理對Cu-Cr-Zr原位復合材料的抗拉強度和導電率的影響。結(jié)果表明：Cu-Cr-Zr合金經(jīng)室溫冷變形，Cr相由鑄態(tài)樹枝狀轉(zhuǎn)變?yōu)槔w維狀；中間熱處理能夠明顯提高材料的導電率；采用500 ℃中間熱處理并結(jié)合冷變形，能得到具有較好綜合性能的Cu-Cr-Zr原位復合材料，其抗拉強度達到1 119 MPa，導電率(vs IACS)達到76%。
關鍵字: Cu-Cr-Zr合金；原位復合材料；高強度；高導電；顯微組織
CHEN Xiao-hong1, TIAN Bao-hong1, REN Feng-zhang1
（1. School of Materials Science and Engineering, Henan University of Science and Technology,
Luoyang 471003, China;
2. Henan Key Laboratory of Advanced Non-ferrous Metals,
Henan University of Science and Technology, Luoyang 471039, China）
Abstract:The Cu-Cr-Zr in-situ composites with high strength and high electrical conductivity were prepared by melting in vacuum combined with the deformation. The microstructures of the composites in the as-cast and deformation were examined by SEM and TEM. The effects of the deformation and the intermediate heat treatment on the tensile strength and electrical conductivity of the Cu-Cr-Zr in-situ composites were investigated. The results show that the Cr dendrites in the as-cast Cu-Cr-Zr alloy are drawn into fibers by the cold deformation at room temperature. The electrical conductivity of the Cu-Cr-Zr in-situ composites can be increased by the intermediate heat treatment. After the intermediate heat treatment at 500 ℃ and the cold deformation, the Cu-Cr-Zr in-situ composites show an excellent combination of the tensile strength of 1 119 MPa and electrical conductivity of 76% (vs IACS).
Key words: Cu-Cr-Zr alloy; in-situ composite; high strength; high electrical conductivity; microstructure
