摘要
采用粉末热等静压+等温锻造复合工艺制备出细晶Ti-17粉末合金材料,并研究了粉末合金在不同条件下的超塑性变形特性。结果表明:粉末热等静压+等温锻造复合工艺可制备出细晶Ti-17粉末钛合金,合金退火后组织内部等轴α相细小。在780~920℃以及应变速率5×10^(-4)~1×10^(-2)s^(-1)内粉末合金都具有超塑性。粉末合金超塑性变形是以晶界滑动为主,以扩散蠕变和晶内位错滑移为辅。孔洞的形核、长大和连接是导致粉末合金超塑性变形失效的主要原因。
The fine-grained TiT 17 powder alloy was prepared by using the combined process of hot insostatic pressing ＋ isothermal forging of the powder. The super plastic deformation characteristic under different conditions was studied The results show that the fine-grained Ti-17 powder titanium alloy can be prepared by the combined process of hot insostatic pressing ＋ isothermal forging. After annealing, the equiaxed α phase in the microstructure of the alloy is fine. The powder alloy exhibits superplasticity at 780-920 ＂C and the strain rate of 5×10^-4-×10^-2s^-1. The superplastic deformation of the powder alloy is dominated by grain boundary sliding, and the secondary is diffusion creep and dislocation slipping. The nncleation, growth and connection of holes are the main reasons for the failure of the superplastic deformation of the powder alloy.
出处
《热加工工艺》
CSCD
北大核心
2017年第1期53-56,60,共5页
Hot Working Technology
关键词
粉末钛合金
等温锻造
超塑性
失效
powder titanium alloy
isothermal forging
superplasticity
failure
作者简介
谢静(1972-)，女，四川德阳人，高级工程师硕士，主要研究方向为钛合金成形工艺：电话：0838-2341920,E-mail：mndjsk@163．com
