热处理中双尺寸O相的变体选择和析出行为  

Variant selection and precipitation behavior of double-size O phases in heat treatment

作　　者：李宗泽 卫俊鑫 高志荣 袁振豪 曹守臻 韩建超 贾燚 LI Zong-ze;WEI Jun-xin;GAO Zhi-rong;YUAN Zhen-hao;CAO Shou-zhen;HAN Jian-chao;JIA Yi(College of Mechanical 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1期218-227,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(202203021224003);中央引导地方科技发展资金资助项目(YDZJSX2021A020,YDZX20191400002149);安徽省仿真设计与现代制造工程技术研究中心开放课题(SGCZXZD2301);安徽省高校优秀拔尖人才培育资助项目(YQYB2024065)。

摘　　要：为提高锻态Ti_(2)AlNb基合金后续热变形能力,对多向锻造后的Ti_(2)AlNb基合金进行了固溶+时效的热处理。研究分析了热处理前后的组织演变、力学性能以及O相的析出行为。结果表明:多向锻造后的空冷的Ti_(2)AlNb合金,组织内析出大量针状O相,位错密度高,晶粒尺寸大,导致其伸长率较低。经过热处理后形成了B2基体+双尺板条/针状O相组织,位错密度降低,α_(2)相以包析反应生成了rim-O相;晶粒内部的析出O相包含4种变体。O相在小角度晶界处沿两侧生长分布,而在大角度晶界处只沿单侧析出生长。热处理后的Ti_(2)AlNb合金表现出显著提高的伸长率,增加了后续热变形的稳定性。To improve the subsequent heat deformation capacity of as-forged Ti_(2)AlNb-based alloys,the Ti_(2)AlNb-based alloys after multidirectional forging were heat-treated by solid solution and aging.The organization evolution,mechanical properties,and precipitation behavior of O phase before and after heat treatment were studied and analyzed.The results show that a large number of needle-like O phases are precipitated within the organization the air-cooled Ti_(2)AlNb-based alloy after multidirectional forging,with high dislocation density and large grain size,resulting in low elongation.After heat treatment,the B2 matrix and dual-size slat/acicular O phase organization are formed,the dislocation density is reduced,and the α_(2) phase is generated as rim-O phase by the inclusion reaction.The precipitated O phase inside the grains contains four variants.The O phase grow and distribute along both sides at the low-angle grain boundaries,whereas it precipitates and grow only along the unilateral sides at the high-angle grain boundaries.The heat-treated Ti_(2)AlNb alloys exhibit significantly higher elongation,increasing the stability of subsequent thermal deformation.

关 键 词：Ti_(2)AlNb合金 热处理 O相析出行为 显微组织 力学性能 

分 类 号：TG166.5[金属学及工艺—热处理]