摘要
研究单重时效、低温-高温双重时效、时效加热速度等工艺对Ti-10V-2Fe-3Al合金显微组织和力学性能的影响。结果表明:经过高温变形后的合金,在双重时效处理过程中,先析出的ω相为α相的沉淀析出提供均匀的形核点,使合金获得比单重时效处理更加均匀细小的α+β显微组织,获得更好的强韧化匹配;合金在以较低的升温速度(0.1℃/s)加热过程中,细小弥散分布的等温ω相有充足的时间析出,从而为后续α相的析出提供有利的形核位置,产生细小盘状α相,获得与双重时效相同的强韧化匹配效果。
Effects of one-step aging, two-step aging of low-temperature and high-temperature and heating rate of aging on the microstructure and mechanical properties of Ti-10V-2Fe-3Al titanium alloy after high temperature deformation were studied. The results show that comparing with one-step aging, in the two-step aging the early precipitated ω particles provided uniform nucleation sites for α phase during the low-temperature aging. As a result, the two-step aging sequences led to much finer and more uniform α＋β microstructure to obtain good match of strength and ductility. For a slow heating rate of 0.1 oC/s to the peak aging temperature, a very finely dispersed isothermal ω-phase had enough time to precipitate, and thus provided nucleation sites of high density for the α-phase, resulting in the very fine α plates; therefore, the same match effect of strength and ductility was obtained
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2010年第6期1061-1065,共5页
Rare Metal Materials and Engineering
基金
航空重点基金(2007ZF21011)
国家重点基础研究发展计划资助项目(2007CB613802)
关键词
钛合金
时效工艺
显微组织
力学性能
titanium alloy aging processing microstructure mechanical properties
