DD3单晶高温合金拉伸蠕变各向异性  

Tensile creep anisotropy of single crystal superalloy DD3

作　　者：魏朋义[1] 杨治国[2] 程晓鸣 钟振刚 李骋 刘世中 

机构地区：[1]北京航空材料研究院,北京100095 [2]中国航空工业总公司第608研究所,湖南株洲412002

出　　处：《航空材料学报》1999年第3期7-12,共6页Journal of Aeronautical Materials

摘　　要：研究了镍基单晶高温合金ＤＤ３（００１），（０１１），（１１１）取向光滑圆拉伸试样在７６０℃，８５０℃，９５０℃典型应力条件下的拉伸蠕变特征。试验发现，在较高蠕变应力水平时，ＤＤ３ 单晶合金具有明显且复杂的拉伸蠕变各向异性，且蠕变变形率及其对应力增加的敏感性的强弱顺序会随温度变化而发生变化。这归因于该合金的成分特征、蠕变应力、晶体取向决定的蠕变主滑移系类型（八面体。Tensile creep anisotropy feature of Ni base single crystal superalloy DD3 with (001),(011),(111) in orientation were investigated under typical conditions(760～950℃,200～800MPa). It was found there is complex and strong creep anisotropy for DD3 under those conditions, such as: the value order of steady creep rate, sensitivity to creep stress and dependence on crystal orientation of this alloy alternate with temperature increasing. Those were due to different crystal slipping(cubic octahedral and combination of them),dislocation movement model and dynamics during those different creep processing, which is determined by composition, ratio between creep stress and tensile strength and crystal orientation of this alloy.

关 键 词：蠕变各向异性 单晶 高温合金 晶体取向 

分 类 号：TG132.32[一般工业技术—材料科学与工程]