退火对冷轧Ti_(2)AlNb基合金带材组织及力学性能的影响  

Effect of annealing on microstructure and mechanical properties of cold-rolled Ti_(2)AlNb-based alloy strip

作　　者：高志荣 卫俊鑫 李宗泽 曹守臻 韩建超 贾燚 GAO Zhi-rong;WEI Jun-xin;LI Zong-ze;CAO Shou-zhen;HAN Jian-chao;JIA Yi(College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China;College of Mechanical and Electrical Engineering,Huangshan University,Huangshan 245041,China;Hai′an Industry Institute of Advanced Manufacturing and Intelligent Equipment,Taiyuan University of Technology,Hai′an 226600,China)

机构地区：[1]太原理工大学机械与运载工程学院,山西太原030024 [2]太原理工大学先进金属复合材料成形技术与装备教育部工程研究中心,山西太原030024 [3]黄山学院机电工程学院,安徽黄山245041 [4]海安太原理工先进制造与智能装备产业研究院,江苏海安226600

出　　处：《塑性工程学报》2025年第2期203-212,共10页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(52275362,51904205);山西省基础研究计划优秀青年培育项目(202203021224003);中央引导地方科技发展资金资助项目(YDZJSX2021A020,YDZX20191400002149);海安太原理工大学先进制造与智能装备产业研究院开放研发项目(2023HA-TYUTKFYF014,HXKT2023133)。

摘　　要：针对Ti_(2)AlNb基合金箔材制备时中间退火工艺的不成熟等问题,对50%冷轧压下量的Ti_(2)AlNb基合金带材进行了不同相区温度的退火,系统分析了冷轧态合金在退火过程中的组织演变与力学性能的变化规律。结果表明,退火后,O相在降温过程中以不同形貌与取向从B2相中大量析出,导致显微组织以O相为主体,且随着退火温度的升高,冷轧态合金中α_(2)相的形貌特征与比例均发生变化。此外,不同退火温度导致显微组织的再结晶程度不同。退火后带材的力学性能受相比例、形貌特征以及再结晶程度的影响。冷轧态合金固有的加工硬化逐渐被消除,导致材料屈服应力减小而伸长率大幅提高。其中1000℃退火态带材伸长率可达8.9%,较冷轧态带材提高了303.2%。Aiming at the problem of the immaturity of intermediate annealing processes in the preparation of Ti_(2)AlNb-based alloy foils,the annealing for Ti_(2)AlNb-based alloy strip with cold rolling reduction of 50%at different temperatures within different phase regions was carried out,and the variation laws of microstructural evolution and mechanical property during annealing process were analyzed systematically.The results show that after annealing,O phases predominantly precipitate from the B2 phase with different morphologies and orientations during cooling process,resulting that the main microstructure is O phase.As the annealing temperature increases,both the morphology and proportion ofα_(2) phase in the cold-rolled state alloy change.Furthermore,different annealing temperatures result in different recrystallization degrees of microstructure.The mechanical properties of the annealed strip are influenced by phase proportions,morphological characteristics and recrystallization degree.The inherent work hardening of the cold-rolled alloy is gradually eliminated,resulting in the decrease of yield stress and the significant increase of elongation.The elongation of the strip annealed at 1000℃reaches 8.9%,which is 303.2%higher than that of the cold rolled strip.

关 键 词：Ti_(2)AlNb基合金 冷轧带材 退火 组织演变 力学性能 

分 类 号：TG166.5[金属学及工艺—热处理]