Cu-Ti合金热塑性变形行为及微观组织  

Thermoplastic Deformation Behavior and Microstructure of Cu-Ti Alloy

作　　者：洪松柏 李学花 于倩 朱云卿 罗毅 汪东亚 刘峰 HONG Songbai;LI Xuehua;YU Qian;ZHU Yunqing;LUO Yi;WANG Dongya;LIU Feng(Ningbo Xingye Xintai New Electronic Materials Co.,Ltd.,Ningbo 315336,China;Ningbo Xingye Shengtai Group Co.,Ltd.,Ningbo 315336,China;State Key Laboratory of Nonferrous Metals and Processes,GRINM Group Co.,Ltd.,Beijing 101400,China;GRIMAT Engineering Institute Co.,Ltd.,Beijing 101400,China;General Research Institute for Nonferrous Metals,Beijing 100088,China)

机构地区：[1]宁波兴业鑫泰新型电子材料有限公司,浙江宁波315336 [2]宁波兴业盛泰集团有限公司,浙江宁波315336 [3]中国有研科技集团有限公司有色金属材料制备加工国家重点实验室,北京101400 [4]有研工程技术研究院有限公司,北京101400 [5]北京有色金属研究总院,北京100088

出　　处：《有色金属工程》2024年第11期85-95,共11页Nonferrous Metals Engineering

基　　金：国家重点研发计划(2023YFB3710000)。

摘　　要：钛青铜凭借出色的力学、弹性和抗应力松弛性能,有望取代环境有害的铍青铜合金,成为下一代高强高弹领域的关键材料。采用Gleeble-1500D热模拟试验机,探究了Cu-Ti合金在变形温度为600~950℃和变形速率为0.01~10 s^(-1)间的热变形行为,得到了Cu-Ti合金的热变形本构关系和热加工图。通过电子背散射衍射(EBSD)对不同热变形制度下Cu-Ti合金的微观组织演变及织构分布进行讨论。结果表明,Cu-Ti合金的热变形激活能约为396.52 kJ/mol,热压缩变形本构方程与实验结果具有良好的匹配关系。在0.01 s^(-1)的应变速率下,合金应力水平随变形温度的升高逐渐降低。在800~850℃时,细小的再结晶晶粒沿晶界处呈链状分布,并伴随着Copper织构的逐渐减少和Brass织构的增加。随着应变温度的升高和应变速率的增大,Cu-Ti合金的再结晶转变进程显著加快。在变形温度达到900℃时,Cube织构的含量逐渐降低,再结晶织构取向与变形晶粒取向基本一致。在常见的沉淀强化型铜合金中,Cu-Ti系合金具有相对较低的热变形激活能,更易发生塑性变形且具有较好的热加工稳定性及稳定的热变形组织。Titanium bronze,with its excellent mechanical properties,elasticity,and resistance to stress relaxation,was expected to replace environmentally harmful beryllium bronze alloys and become a key material in the next generation of high-strength and high-elasticity applications.The hot deformation behavior of Cu-Ti alloys at deformation temperatures of 600-950℃ and deformation rates with 0.01-10 s^(-1) was investigated using a Gleeble-1500D thermal simulation tester.The constitutive relationship and hot working map of Cu-Ti alloys were established.Microstructural evolution and texture distribution of Cu-Ti alloys under different hot deformation processing conditions were discussed using Electron Backscatter Diffraction(EBSD)technology.The results show that the activation energy for hot deformation of Cu-Ti alloys is approximately 396.52 kJ/mol and the hot compression deformation constitutive equation agrees well with the experimental results.At a strain rate of 0.01 s^(-1),the stress decreases with the increas in deformation temperature.Fine recrystallized grains form a chain-like distribution along grain boundaries during the deformation temperature of 800℃ to 850℃,with a gradual reduction in Copper texture and an increase in Brass texture.Higher deformation temperatures and strain rates significantly accelerate the recrystallization transformation process.At 900℃,the content of Cube texture decreases,and the orientation of the recrystallized texture closely matches that of the deformed grains.Among the typical precipitation-strengthened copper alloys,Cu-Ti alloys have relatively low hot deformation activation energy,making them more susceptible to plastic deformation and offering good thermal processing stability and stable hot deformation microstructure.

关 键 词：Cu-Ti合金 热变形激活能 热加工图 显微组织 

分 类 号：TG146.11[一般工业技术—材料科学与工程] TG113.1[金属学及工艺—金属材料]