Influence of Initial States on Creep Aging Behavior of 2195 Al-Li Alloy and Associated Mechanism
Creep aging characteristics of 2195 Al-Li alloy with three initial tempers were investigated through creep aging tests conducted at 180 ℃ and constant stress of 140 MPa as well as room temperature mechanical tensile tests and Scanning Electron Microscopy(SEM)observations.The research results indicate that the creep deformation of the alloy with resolution temper is the highest,followed by the peak aging temper,and the sample with regression temper has the smallest creep deformation.The order of yield and tensile strength is resolution temper＞peak aging temper＞regression temper.The elongation at break is in the order of resolution＞peak aging＞regression.Finally,the mechanism responsible for the high strength and toughness of the creep-aged alloy with resolution temper has been elucidated.It is attributed to the synergistic impact of the fine strengthening T1 phase evenly dispersed within the grains and the narrow precipitation-free zone width along grain boundaries.
NETL
NSTL
万方数据
