双辊铸轧Cu-3.2Ni-0.75Si合金组织和析出行为  

Solidification Structure and Precipitation Behavior of Cu-3.2Ni-0.75Si Alloy Prepared by Twin-roll Strip Casting

作　　者：赵丹 贾飞 张雷 程战[1] 樊志斌 纠永涛 ZHAO Dan;JIA Fei;ZHANG Lei;CHENG Zhan;FAN Zhibin;JIU Yongtao(China Academy of Machinery Ningbo Academy of Intelligent Machine Tool Co.,Ltd.,Ningbo 315700;State Key Laboratory of New Brazing Materials and Technology,Zhengzhou Machinery Research Institute Co.,Ltd.,Zhengzhou 450001;Department of Mechanical Engineering,Tsinghua University,Beijing 100084;Ningbo Zhongji Songlan Cutting Tool Technology Co.,Ltd.,Ningbo 315700)

机构地区：[1]中国机械总院集团宁波智能机床研究院有限公司,宁波315700 [2]新型钎焊材料与技术国家重点实验室,郑州机械研究所有限公司,郑州450001 [3]清华大学机械工程系,北京100084 [4]宁波中机松兰刀具科技有限公司,宁波315700

出　　处：《特种铸造及有色合金》2025年第1期104-108,共5页Special Casting & Nonferrous Alloys

基　　金：河南省重大关键技术揭榜攻关资助项目(191110111000);宁波市“3315”人才计划2020年创新团队C类;中原科技创新领军人才资助项目(234200510015);宁波市自然科学基金资助项目(2021J042)。

摘　　要：采用双辊铸轧和普通熔铸制备了Cu-3.2Ni-0.75Si合金,研究了双辊铸轧工艺对合金凝固组织、析出行为和力学性能的影响。结果表明,双辊铸轧工艺可显著细化合金凝固组织,相较于铸锭毫米级的晶粒尺寸,铸带边部的晶粒尺寸为130~180μm,心部细小等轴晶的尺寸约为15μm。铸锭和铸带经同等工艺冷轧和时效后,前者析出相呈圆片状聚集分布,直径约为80 nm;后者析出相呈棒状和圆片状弥散分布,圆片状直径约为25 nm,棒状的长度约为70 nm。结合能谱分析,确认圆片状析出相为δ-Ni2Si,棒状析出相为β-Ni3Si。时效处理后,铸锭和铸带的抗拉强度、硬度(HV)和电导率分别为487 MPa、172、22.33 MS/m和569 MPa、213、26.97 MS/m。Cu-3.2Ni-0.75Si alloy was prepared by twin-roll strip casting and ordinary melting casting,and influence of twin-roll strip casting process on solidification structure,precipitation behavior,and mechanical properties of the alloy was investigated.The results reveal that the twin-roll strip casting process can significantly refine the solidification structure of the alloy.Compared to the grain size of ingot in millimeters,the grain size at the edge of casting strip is approximately 130~180μm,and the size of small equiaxed crystals at the center is about 15μm.After common cold rolling and aging process,the precipitates in the ingot are distributed in circular clusters with a diameter of 80 nm,and those in the casting strip are dispersed in the form of rods and discs with a disc diameter of 25 nm or a rod length of about 70 nm.Energy spectrum analysis indicates that the circular precipitate phase is determined asδ-Ni2Si,and rod-shaped precipitate isβ-Ni3Si.After aging treatment,the tensile strength,micro-hardness,and conductivity of ingot and strip casting are 487 MPa,172 HV,22.33 MS/m and 569 MPa,213 HV,26.97 MS/m,respectively.

关 键 词：Cu-3.2Ni-0.75Si合金 双辊铸轧 冷轧 时效处理 力学性能 

分 类 号：TG146.1[一般工业技术—材料科学与工程] TG115.21[金属学及工艺—金属材料]