在室温和液氮温度Ti-Al-Fe合金的拉伸行为及其变形机理  

Tensile Behavior and Plastic Deformation Mechanism of Ti-Al-Fe Alloy at Room Temperature and Liquid Nitrogen Temperature

作　　者：尹艳超 吕逸帆 刘千里 许亚利 蒋鹏 余巍 YIN Yanchao;LV Yifan;LIU Qianli;XU Yali;JIANG Peng;YU Wei(Luoyang Ship Material Research Institute,Luoyang 471023,China)

机构地区：[1]中国船舶集团有限公司第七二五研究所,洛阳471023

出　　处：《材料研究学报》2024年第3期232-240,共9页Chinese Journal of Materials Research

基　　金：国家自然科学基金(51701189)。

摘　　要：在室温(25℃)和液氮温度(-196℃)测试Ti-Al-Fe合金的拉伸性能,并使用扫描电镜(SEM)、透射电镜(TEM)和电子背散射衍射(EBSD)表征和分析破断后试样的显微组织和断口形貌,研究了这种合金的拉伸行为及其变形机理。结果表明,Ti-Al-Fe合金在25℃拉伸塑性变形后,在其显微组织中极少发现孪晶,其塑性变形机制主要为位错滑移。在-196℃该合金的强度和塑性较好,表现出孪晶诱发塑性效应,在塑性变形过程中生成了大量孪晶,其类型为{1122}型压缩孪晶、{1012}型拉伸孪晶和{1124}型压缩孪晶,其塑性变形机制为滑移和孪生共存。在不同变形阶段孪晶的类型和数量不同,在变形初期孪晶的类型主要为{1122}型孪晶,在变形后期{10-12}型孪晶的数量增多。The tensile properties of Ti-Al-Fe alloy were assessed at 25oC and-196oC respectively,aiming to understand the service performance and plastic deformation mechanism of the low-cost Ti-Al-Fe alloy at extreme low temperatures,so that to ensure the service safety of the relevant engineering structures.The microstructure and fracture surface of the alloy were characterized by scanning electron microscope,transmission electron microscope and electron backscatter diffraction technology.The results show that twinning is rarely found in the microstructure of the alloy after plastic deformation at 25oC,and the plastic deformation mechanism is mainly dislocation slipping.Ti-Al-Fe alloy exhibits better strength and plasticity at 196oC,with clear twinning induced plastic effect.A large number of twins are produced during plastic deformation,which include{1122}compression twins,{1012}tensile twins,{1124}compression twins.The plastic deformation mechanism may be ascribed to the coexistence of slipping and twinning.At the initial stage of deformation,{1122}twins are mainly found,and the number of{1012}twins increase at the later stage of deformation.

关 键 词：金属材料 Ti-Al-Fe合金 拉伸性能 塑性变形机制 孪晶 

分 类 号：TG146.23[一般工业技术—材料科学与工程]