CAJ | 학술논문

【目的】研究一维纳米晶材料演化过程中的小角度晶界湮没过程，探究向错强度与阻尼系数对位错湮没的影响。【方法】建立位错运动方程，计算模拟小角度晶界的晶格位错在外应力作用下发生的变化。【结果】随着切应力增加，晶界由过阻尼运动变为无穷远的单向运动，向错强度越大晶界越难以湮没，并且晶界位错由同时湮没转变为两端先湮没，中心后湮没；阻尼系数越大，湮没临界切应力越大，但到达一定值时，阻尼系数不再影响临界值。【结论】晶界湮没存在临界切应力，向错强度主要影响临界切应力，阻尼系数主要影响位错初始速度和运动停止时间。
【목적】연구일유납미정재료연화과정중적소각도정계인몰과정，탐구향착강도여조니계수대위착인몰적영향。【방법】건립위착운동방정，계산모의소각도정계적정격위착재외응력작용하발생적변화。【결과】수착절응력증가，정계유과조니운동변위무궁원적단향운동，향착강도월대정계월난이인몰，병차정계위착유동시인몰전변위량단선인몰，중심후인몰；조니계수월대，인몰림계절응력월대，단도체일정치시，조니계수불재영향림계치。【결론】정계인몰존재림계절응력，향착강도주요영향림계절응력，조니계수주요영향위착초시속도화운동정지시간。
[Objective]The evolution process of the annihilation of small angle grain boundaries in an one-dimensional crystal material was researched,and the effects of disclination strength and damping coefficient on the annihilation of dislocations were explored.[Methods]The movement equations of dislocations were established,and the dislocation motions in low angle grain boundaries were calculated and simulated under external shear stress.[Results]With shear stress progressing,the movement of grain boundary turns to directional motion in which dislo-cations can go to infinity.The bigger the value of disclination strength is,the more difficult the grain boundary annihilation is.Furthermore,grain boundary annihilation changes from simulta-neously running away to central dislocation releasing after escaping of dislocations in both ends.The bigger the damping coefficient is,the bigger the critical shear stress of annihilation. But when it reaches a certain point,damping coefficient doesn’t have an impact on critical stress anymore.[Conclusion]There is a critical value for grain boundary annihilation.Disclina-tion strength mainly affects critical value,while damping coefficient plays an indispensable role in original velocity and motion ceasing time of dislocation.