氢对Ⅲ型裂纹尖端应力场中螺位错受力的影响  

Influence of Hydrogen on the Stress Condition of the Screw Dislocation at the Stress Field of Mode Ⅲ Crack Tip

作　　者：廖波[1] 祖承德 康大韬[1] 宋尚军[1] 

机构地区：[1]燕山大学,大连重型机器厂

出　　处：《东北重型机械学院学报》1996年第1期1-5,共5页

基　　金：国家博士后基金

摘　　要：根据理论分析和实验观察表明．Ⅲ型裂纹尖端应力场中存在的偏聚氢原子将对该应力场中的发射位错产生附加作用力．此作用力使裂尖发射出的螺位错离开裂尖区域的阻力增大．导致裂尖无位错区变短．同时、裂尖区域偏聚氢原子促进螺位错以交滑移的方式运动．Based on the theoretical analysis and the testing observations. theexperimental results show that the hydrogen atoms concentrated in the stress fieldof mode Ⅲ crack tip will introduce additional force for the emitting screwdislocations from crack tip. This additional force causes the increase of movingresistance of screw dislocations. then the dislocation-free zone(DFZ)of cracktip decreases.The concentrated hydrogen atoms at crack tip region will promotethe movement of the dislocations in cross slip way.

关 键 词：裂纹 发射螺位错 应力场 金属材料 

分 类 号：TG111.91[金属学及工艺—物理冶金]