摘要
测量了中碳钢试件表面各点的磁记忆信号,并观察断口的组织,研究了外载荷对磁记忆信号的影响和金属磁记忆的微观机理．结果表明:在弹性变形阶段内,随着载荷的增加中碳钢试件表面各点磁信号值由初始无规律分布逐渐向磁有序状态转变;进入塑性变形阶段后,位错对磁畴运动的钉扎使磁有序转变过程停止,磁信号几乎不再随载荷而变化．对于在弹性和塑性加载范围内卸载的两个试件,表面磁信号均具有不同程度的时效现象,试件的断口呈现韧窝及准解理混合断裂形式．
The static tensile test of medium memory signals under load-on and load-off state carbon steel sheet specimens were performed, magnetic were measured and fractograph was observed in order to investigate the micromechanism of metal magnetic memory and effect of load on magnetic memory signals. The results showed that in the elastic deformation stage the magnetic signals transformed from initial random distribution to magnetic ordering state. However, the value of magnetic signals during the plastic deformation stage could hardly change as applied load increasing due to the dislocation pinning the magnetic domain structure. The magnetic signals of two specimens unloaded in elastic deformation stage or plastic deformation stage respectively present aging phenomenon. The dimple and quasi-cleavage crack are observed on the fracture zones of specimens.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2006年第4期440-444,共5页
Chinese Journal of Materials Research
基金
国家自然科学基金50235030
"十五"预先研究基金41327030202资助项目.~~
关键词
材料检测与分析技术
金属磁记忆
弹性变形
塑性变形
measuring and analysis for materials, metal magnetic memory, elastic deformation plastic deformation
