组合形变热处理工艺对Cu-Cr-Zr-Si合金组织性能及抗软化特性的影响  

Effect of combined thermo-mechanical treatment on microstructure,properties and softening resistance of Cu-Cr-Zr-Si alloy

作　　者：徐晓岑 李家智 丁桦 高维林 XU Xiao-cen;LI Jia-zhi;DING Hua;GAO Wei-lin(School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China;Key Laboratory of Lightweight Structral Materials,Liaoning Province,Shenyang 110819,China;School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]东北大学材料科学与工程学院,辽宁沈阳110819 [2]辽宁省轻量化用关键金属结构材料重点实验室,辽宁沈阳110819 [3]郑州大学材料科学与工程学院,河南郑州450001

出　　处：《材料热处理学报》2021年第7期57-64,共8页Transactions of Materials and Heat Treatment

摘　　要：采用光学显微镜、透射电镜、电子万能试验机、数字电导率仪和维氏硬度计等研究了不同形变热处理工艺对Cu-0.31Cr-0.19Zr-0.03Si(mass%)合金组织演变、力学性能、电学性能及抗软化特性的影响。结果表明:经960℃×1 h固溶处理+450℃×2 h预时效处理+80%冷轧+450℃×1 h时效处理后(组合形变热处理),合金的抗拉强度达到615 MPa,屈服强度达到598 MPa,硬度达到206 HV,电导率达到70.5%IACS。合金经预时效处理后在基体中析出大量弥散分布的细小析出相,在后续的冷轧中,析出相与位错发生强烈交互作用,在基体中引入高密度的位错,从而提高合金的力学性能。此外,对经组合形变热处理取得峰值强度的试样进行了抗软化性能的研究,结果表明该合金的软化温度高达580℃。经微观组织分析发现,在该温度下合金中析出相发生了粗化,但再结晶程度较低,此时引起合金软化的主要机制为析出相长大机制。Effect of different thermo-mechanical treatment on microstructure evolution, mechanical properties, electrical properties and softening resistance of Cu-0.31 Cr-0.19 Zr-0.03 Si(mass%) alloy was investigated by means of optical microscope, transmission electron microscopy, electronic universal testing machine, digital conductivity meter and Vickers hardness tester. The results show that the tensile strength, yield strength, microhardness and electrical conductivity of the Cu-0.31 Cr-0.19 Zr-0.03 Si alloy after solution treatment at 960 ℃ for 1 h plus pre-aging at 450 ℃ for 2 h plus 80% room-temperature cold rolling and aging at 450 ℃ for 1 h(combined thermo-mechanical treatment) are 615 MPa, 598 MPa, 206 HV and 70.5 %IACS, respectively. After pre-aging treatment, a large number of dispersed fine precipitates precipitate in the matrix. In the subsequent cold rolling, the precipitates interact strongly with dislocations, leading to the introduction of high-density dislocations in the matrix, thus improving the mechanical properties of the alloy. In addition, the softening resistance of the alloy with peak strength obtained by the combined thermomechanical treatment was studied. The results show that the softening temperature of the alloy is as high as 580 ℃. The microstructure analysis shows that the precipitates coarsen at this temperature, but the degree of recrystallization is low, and the main softening mechanism of the alloy is the growth of precipitates.

关 键 词：Cu-Cr-Zr-Si合金 抗拉强度 显微硬度 电导率 抗软化性能 

分 类 号：TG146.1[一般工业技术—材料科学与工程]