一种单晶镍基合金压缩蠕变期间γ′相的定向粗化  

DIRECTIONAL COARSENING OF THE γ'-PHASE DURING COMPRESSION CREEP OF A SINGLE CRVSTAL NICKEL-BASE SUPERALLOY

作　　者：田素贵[1] 周惠华[1] 张静华[1] 杨洪才[2] 徐永波[1] 胡壮麒[1] 

机构地区：[1]中国科学院金属研究所材料疲劳与断裂国家重点实验室,沈阳110015 [2]东北大学材料科学与工程系,沈阳110006

出　　处：《金属学报》1998年第12期1261-1266,共6页Acta Metallurgica Sinica

基　　金：国家自然科学基金!59571039

摘　　要：对［001］取向单晶镍基合金恒温恒载压缩蠕变不同时间的组织形貌进行SEM和TEM观察表明：蠕变初期，两立方γ′相沿平行于应力轴方向扩散相连定向生长成为条形筏结构；垂直通道中基体[001］晶向共格应变量减小，应变能降低是合金元素定向扩散形成γ′相筏结构的驱动力；压缩与拉伸蠕变相比较，γ′相形筏所需要的时间较长。The microstructures of a single crystal nickel-base superalloy with [001] orientation at different creep stages of the constant loading compression were observed by meansof TEM and SEM. The results showed that the strip--like rafts were formed along the directionparallel to the stress axis in a mode of the side plane link in primary creep. The applied stressresulted in the decrease of coherent strain and energy of the 7i/7 interfaces parallel to the stressaxis The energy released was supposed to be the driving force for the diffusion elements. Bycompared compressive creep with tensile, the longer time and bigger stress were needed for ther' rafted.

关 键 词：单晶镍基合金 压缩蠕变 定向粗化 扩散驱动力 

分 类 号：TG146.15[一般工业技术—材料科学与工程] TG111.8[金属学及工艺—金属材料]