一种单晶镍基合金蠕变期间位错网的形成与作用  

FORMATION AND ROLE OF DISLOCATION NETWORKS FOR A SINGLE CRVSTAL NICKEL-BASE SUPERALLOY DURING HIGH TEMPERATURE CREEP

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 [2]东北大学

出　　处：《材料研究学报》1999年第6期632-636,共5页Chinese Journal of Materials Research

基　　金：国家自然科学基金!59871052

摘　　要：对[001]取向单晶镍基合金的恒温拉伸蠕变组织形貌的TEM观察表明，蠕变初期，基体γ相八面体滑移系中两组1／2＜110＞位错运动至同一晶面相遇，发生反应形成三维节点的位错网络；稳态期间，基体中运动位错可通过界面位错网攀移越过筏状γ相；The microstructures for a single crystal nickel-base superalloy with [001] orientation,after tension load at 1040℃ under 120 MPa for various creep time, were observed by measns of TEM.The results showed that the three-dimenision dislocation networks on the γ/γ phase intedsces were formed by the dislocation reaction when two sets dislocations with difFerent Burgets vectors meet during primary creep. The motion dislocations in the 7 matrix may climb over the rafts γ' phase by means of the dislocation networks during steady creep. In latter stage of creep, the deformation feature is the moving dislocations shearing into the rafts γ' phase on the γ'/γ phase interfaces where the dislocation networks were damaged.

关 键 词：单晶镍基合金 位错反应 位错网 蠕变 衍衬分析 

分 类 号：TG111.8[金属学及工艺—物理冶金] TG146.15[金属学及工艺—金属学]