强变形对Cu-Cr合金组织性能的影响
收稿日期: 2012-05-10
修回日期: 2012-07-26
网络出版日期: 2012-12-11
基金资助
国家自然科学基金项目11202183和50671092, 国家科技支撑计划项目2009BAG12A09和浙江省自然科学基金项目Y4100193资助
EFFECT OF HEAVILY DRAWING ON THE MICROSTRUCTURE AND PROPERTIES OF Cu–Cr ALLOYS
Received date: 2012-05-10
Revised date: 2012-07-26
Online published: 2012-12-11
Supported by
Supported by National Natural Science Foundation of China (Nos.11202183 and 50671092), Key Technologies R&D Program (No.2009BAG12A09) and Natural Science Foundation of Zhejiang Province (No.Y4100193)
宋鲁男 刘嘉斌 黄六一 曾跃武 孟亮 . 强变形对Cu-Cr合金组织性能的影响[J]. 金属学报, 2012 , 48(12) : 1459 -1466 . DOI: 10.3724/SP.J.1037.2012.00263
Cu–Cr alloy is a kind of promising materials used as conductor due to its good strength and high conductivity. Heavy cold deformation could increase the strength effectively. Most of Cu and Cr phase are elongated into filaments during cold drawing. There exits plenty of Cu/Cr interface and the structure of Cu/Cr interface is thought to play an essential role in the properties of the Cu–Cr alloy. In this work, Cu–Cr wires were prepared by cold drawing method. The evolution of the microstructure and the structural change of phase interface during cold drawing have been investigated and the relationship between properties and microstructure also established. The microstructure consists of Cu matrix and Cr particles before cold drawing. As the drawing strain increases, both of Cu and Cr phases evolve into filamentary structure. Some residual Cr particles are still found in the alloy even at high drawing ratio. There is a relationship of (111)Cu//(110)Cr between Cu fibers and Cr fibers at high strain levels. The Cu/Cr interface is non–coherent before cold drawing and gradually evolves into the coherent interface at high drawing strains. The inter–solution ability of Cu and Cr elements across the Cu/Cr interface is enhanced with the increase in the drawing strain. The coherent Cu/Cr interface and the increasing of interface density should be responsible for the strength rising to an almost constant value and the increase in electrical resistivity of Cu–Cr alloys at high strain levels.
Key words： Cu–Cr alloy; strength; conductivity; phase interface
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