多级形变热处理Cu-Ni-Co-Si-Cr-Mg合金的组织与性能  

Microstructure and properties of Cu-Ni-Co-Si-Cr-Mg alloy by multistage thermomechanical treatment

作　　者：秦柳馨 周涛 姜晓羽 王檬 胡锦辉 吴子潇 孟祥鹏 姜雁斌 李周[1,2] Liu-xin QIN;Tao ZHOU;Xiao-yu JIANG;Meng WANG;Jin-hui HU;Zi-xiao WU;Xiang-peng MENG;Yan-bin JIANG;Zhou LI(School of Materials Science and Engineering,Central South University,Changsha 410083,China;State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第12期3739-3755,共17页中国有色金属学报（英文版）

基　　金：supported by the National Key Research and Development Program of China(No.2020YFB0311102);the Ningbo“Science and Technology Innovation 2025”Major Project,China(No.2019B10087)。

摘　　要：设计并制备一种高强度、中等导电性的Cu-1.3Ni-1.2Co-0.7Si-0.3Cr-0.1 Mg合金。研究多级形变热处理对合金组织和性能的影响及其强化机制。结果表明,在时效过程中,高密度位错区和亚晶界处析出大量纳米级的β-Ni_(3)Si、δ-(Ni,Co)_(2)Si和Cr相颗粒,凝固过程中形成亚微米级Cr_(3)Si相。该合金的抗拉强度、屈服强度和电导率分别为882 MPa、857 MPa和46.7%(IACS)。通过强化模型的计算和强度测试,该合金的主要强化机制为析出强化、应变强化和亚结构强化。A Cu-1.3Ni-1.2Co-0.7Si-0.3Cr-0.1Mg alloy with high strength and medium conductivity was designed and prepared.The effects of multistage thermomechanical treatment on the microstructure and properties of the alloy and its strengthening mechanism were studied.The results showed that a large number of nanoscale β-Ni_(3)Si,δ-(Ni,Co)_(2)Si and Cr phase particles precipitated in the high-density dislocation region and sub-grain boundaries during aging,and submicron Cr_(3)Si phase particles formed during solidification of the alloy.The tensile strength,yield strength and electrical conductivity of the alloy were 882 MPa,857 MPa and 46.7%(IACS),respectively.The main strengthening mechanisms of the alloy were precipitation strengthening,strain strengthening and sub-structure strengthening through the strengthening model calculation and measured strength.

关 键 词：多元合金化 显微组织演变 析出相 性能 强化机制 

分 类 号：TG156.93[金属学及工艺—热处理] TG146.11[金属学及工艺—金属学]