张浩宇,黎小辉,林立,张思倩,王川,陈立佳.时效温度对一种新型β钛合金组织演变及力学性能的影响[J].稀有金属材料与工程,2019,48(12):3812~3818.[Zhang Haoyu,Li Xiaohui,Lin Li,Zhang Siqian,Wang Chuan,Chen Lijia.Effect of aging temperature on microstructural evolution and mechanical properties in a novel β titanium alloy[J].Rare Metal Materials and Engineering,2019,48(12):3812~3818.]
时效温度对一种新型β钛合金组织演变及力学性能的影响
投稿时间:2018-06-09  修订日期:2019-11-04
中文关键词:  β钛合金  时效处理  次生α相  显微组织  力学性能
基金项目:广东省金属强韧化技术与应用重点实验室开放课题(GKL201608);辽宁省教育厅科学研究项目(LGD2016019)
中文摘要:
      采用d-电子合金设计法设计了一种β钛合金,Ti-6Mo-5V-3Al-2Fe(wt.%)。在450℃~600℃范围内选取了多个时效温度进行时效处理,以研究时效温度对该合金组织演变及力学性能的影响。结果表明,当时效温度为500℃时,在ω辅助形核机制作用下,形成了尺寸和相间距更小的次生α相,在此细小的次生α相对β基体的强化作用下合金抗拉强度达到最大值,为1510MPa;同时,由于晶界α相的析出以及晶界无析出区的形成,导致合金的塑性极差,伸长率仅为4.6%。随着时效温度的升高,晶内细小的次生α相粗化。粗大的次生α相导致其相间距增大,并使可有效阻碍位错运动的α/β相界面减小。时效温度的升高使合金强度降低,但合金塑性提高。当时效温度升高至600℃,在β晶界处形成了向晶内平行生长的板条状次生α相,同时β晶粒内次生α相间距增大,使合金塑性明显提高,伸长率可达12.2%。
Effect of aging temperature on microstructural evolution and mechanical properties in a novel β titanium alloy
英文关键词:β titanium alloy  aging  secondary α phase  microstructure  mechanical properties
英文摘要:
      A β titanium alloy Ti-6Mo-5V-3Al-2Fe(wt.%) was designed in terms of d-electron alloy design method. Aging treatment was performed at various temperatures ranging from 450℃ to 600℃ for 4h to study the effect of aging temperature on microstructure evolution and tensile properties. The results show that the secondary α phase with smaller size and inter-particle spacing formed under ω-assisted nucleation mechanism at the aging temperature of 500℃. The highest ultimate tensile strength of 1510MPa is obtained due to the strengthening of fine acicular secondary α phase within β grain, while poor elongation of 4.6% is found as a result of the inevitable precipitation of α phase at grain boundary and the formation of precipitate free zone near grain boundaries. Fine secondary α precipitates tends to coarsen with the increasing aging temperature. Coarse α precipitates can bring about broad inter-particle spacing and can result in less α/β interfaces that act as effective dislocation barriers. The increase of aging temperature leads to the variation of tensile properties, i.e. the strength decreased while ductility changed in opposite way. A considerable improvement of elongation to 12.2% is achieved by increasing aging temperature to 600℃, in association with the formation of parallel secondary α laths near β grain boundaries and broad inter-particle spacing of secondary α phase within β grains.
作者单位E-mail
张浩宇 广东省金属强韧化技术与应用重点实验室 zhanghaoyu@sut.edu.cn 
黎小辉 广东省金属强韧化技术与应用重点实验室  
林立 沈阳工业大学材料科学与工程学院  
张思倩 沈阳工业大学材料科学与工程学院  
王川 沈阳航天新光集团  
陈立佳 沈阳工业大学材料科学与工程学院  
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