摘要
设计并制备了一种新型Ti-Al-V-Zr-Mo-Nb系近α型粉末冶金低温钛合金CT1400,并对其进行了系统的微观结构表征、室温/低温力学性能测试以及变形行为分析。结果表明,CT1400主要由片层α相、等轴α相以及少量片层β相组成,由动态再结晶形成的等轴α相体积分数随成形温度的提升而增加。得益于最为充分的动态再结晶过程,920℃制备的样品具有最佳的室温和低温综合力学性能。此外,CT1400在20 K低温条件下的变形为一种位错滑移+孪生的混合变形行为,孪生变形可以通过协调位错滑移提升材料的低温塑性,而低温下的位错强化作用导致CT1400具有较高的极限抗拉强度,使其表现出优异的低温强塑性匹配。
A novel near α-type powder metallurgy Ti-Al-V-Zr-Mo-Nb cryogenic titanium alloy(CT1400) was designed and fabricated. The microstructure characterization, room temperature and cryogenic mechanical properties and deformation behavior were investigated. The results indicate that the CT1400 mainly consists of lamellar α, equiaxed α and a few of lamellar β, and the volume fraction of equiaxed αformed by dynamic recrystallization process increases with the increasing of fabrication temperature. The sample fabricated at 920 ℃displays optimal room temperature and cryogenic mechanical properties resulting from the most sufficient dynamic recrystallization process. Furthermore, CT1400 shows a mixed dislocation slipping and twinning deformation behavior at cryogenic temperature of 20 K,and the twinning deformation could improve the plastic deformation capacity of CT1400 via coordinating dislocation slipping. Finally, the dislocation strengthening effect induces the superior ultimate tensile strength under cryogenics temperature, and contributes to the excellent coupling of strength and ductility of CT1400.
作者
陆子川
孙亚超
姚草根
李圣刚
候智敏
张绪虎
纪玮
张海洋
Lu Zichuan;Sun Yachao;Yao Caogen;Li Shenggang;Hou Zhimin;Zhang Xuhu;Ji Wei;Zhang Haiyang(Aerospace Research Institute of Materials and Processing Technology,Beijing 100076,China;Western Titanium Technology Co.,Ltd,Xi’an 710201,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2022年第1期217-224,共8页
Rare Metal Materials and Engineering
基金
装备预先研究项目(61409220123,41422060206)
国防基础科研计划(JCKY2018203C031)。
关键词
钛合金
低温
显微组织
力学性能
titanium alloy
cryogenic
microstructure
mechanical properties
