摘要
对在 76 0℃温度下两种多滑移取向的镍基单晶合金 DD6的循环形变进行了研究。结果表明 ,[1 1 1 ]取向及大应变幅条件下的 [0 0 1 ]取向表现出一定程度的循环硬化。对于这两种取向 ,循环应力的不对称性与应变幅有关。应力幅对最大和最小循环应力差值的影响总是趋于产生与拉伸和压缩屈服应力不对称相反的效果。
Fully reversed low cycle fatigue tests were conducted on and oriented single crystals of the nickel base superalloy DD6 at 760℃ The results show that the and specimens under high total strain amplitudes exhibit cyclic hardening depending on the imposed total strain amplitudes, and this cyclic hardening is related to the dislocation particle interactions There are two different factors that act on the tension compression asymmetry of the DD6 under cyclic loading, the LCP model mechanism and mechanical hardening mechanism Which mechanism will dominate the asymmetry lay on the imposed total strain amplitudes
出处
《材料工程》
EI
CAS
CSCD
北大核心
2002年第5期7-10,共4页
Journal of Materials Engineering
关键词
镍基单晶高温合金
循环形变
single crystal superalloy
cyclic deformation
