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邢岩,李周,甘雪萍,李思,张洋,张县委,宋克兴.形变热处理对Cu-15Ni-8Sn系合金组织结构与性能的影响[J].稀有金属材料与工程(英文),2018,47(1):286~292.[Xing Yan,Li Zhou,Gan Xueping,Li Si,Zhang Yang,Zhang Xianwei,Song Kexing.Effect of thermo-mechanical treatment on microstructure and property of Cu-15Ni-8Sn alloy[J].Rare Metal Materials and Engineering,2018,47(1):286~292.]
Effect of thermo-mechanical treatment on microstructure and property of Cu-15Ni-8Sn alloy
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Received:November 18, 2015  Revised:March 14, 2016
Key words: Cu-15Ni-8Sn alloy  homogenization  thermo-mechanical treatment  microstructure  mechanical property
Foundation item:中南大学创新驱动计划项目资助;国家自然科学基金项目(51271203)
Author NameAffiliationE-mail
Xing Yan School of Material Science and Engineering,Central South University csznxy@163.com 
Li Zhou School of Material Science and Engineering,Central South University
Key Laboratory of Powder Metallurgy 
Gan Xueping Key Laboratory of Powder Metallurgy  
Li Si School of Material Science and Engineering,Central South University 734738829@qq.com 
Zhang Yang School of Material Science and Engineering,Central South University 1541833585@qq.com 
Zhang Xianwei School of Material Science and Engineering,Central South UniversityCNMC Albetter Albronze Co Ltd 453618889@qq.com 
Song Kexing 河南科技大学 材料科学与工程学院  
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      The effect of homogenizing annealing and thermo-mechanical treatment processes on microstructure and property of Cu-15Ni-8Sn-1.0Zn-0.8Al-0.2Si alloy was investigated using mechanical property test, electrical conductivity measurement, optical microscopy, scanning electron microscopy and transmission electron microscopy. The alloy ingot was two-stage homogenizing annealing treated at 830 ℃/2h+850 ℃/2h, hot rolled by 70%, then solution treated at 850 ℃ for 1 h, followed by 60% cold-rolling deformation and aging treatment at 400 ℃ and 450 ℃ respectively. After aged at 450 ℃ for 30 min, the hardness was 378HV, electrical conductivity was 8.0% IACS, tensile strength was 1144MPa, yield strength was 1098MPa, elongation percentage was 3.29%. During aging at 400 ℃ for 1 h, the hardness was 390 HV, electrical conductivity was 7.4% IACS, tensile strength was 1164 MPa, yield strength was 1112 MPa, elongation percentage was 3.05%. The combined effects of spinodal decomposition strengthening, precipitation strengthening and substructure strengthening were the mainly strengthening mechanism in alloy. Meanwhile, since the precipitation of solute atoms, the solid solubility of matrix was reduced, and the electrical conductivity of alloy was improved. After two-stage homogenizing annealing treatment, the microstructure of alloy was homogeneous equiaxed grain. It was found that spinodal decomposition and L12 ordering (β-Ni3Sn) appeared in the alloy during aging at 400 ℃ for 1h. The crystal orientation relationships between copper matrix and β-Ni3Sn precipitates were determined as: ‖ , ‖ ; ‖ , ‖ .