CAJ | 학술논문

【目的】探讨纳米晶材料中小角度晶界位错在应力作用下的演化机理。【方法】通过分析位错受力，建立动力学方程，分析晶界斜排位错在受到外应力作用下的运动规律。【结果】晶界位错的3个部分结果不同，处在中心位错以上的位错（第1部分）在剪切应力不断增大的过程中，会经过滑移，波动，最后沿柏氏矢量方向滑移过程；中心位错（第2部分）会经过滑移，波动，再滑移过程；中心位错以下的位错（第3部分）会先逆柏氏矢量方向滑移，然后改变运动方向进行攀移，最后回到第5个位错的初始位置后沿柏氏矢量滑移。【结论】当晶界位错受到外应力作用时，晶界会马上瓦解，外应力是导致晶界瓦解的主要因素。对比水平位错的晶界，斜排位错组成的晶界瓦解不具有对称性，每个位错的运动规律都各有特点。
【목적】탐토납미정재료중소각도정계위착재응력작용하적연화궤리。【방법】통과분석위착수력，건립동역학방정，분석정계사배위착재수도외응력작용하적운동규률。【결과】정계위착적3개부분결과불동，처재중심위착이상적위착（제1부분）재전절응력불단증대적과정중，회경과활이，파동，최후연백씨시량방향활이과정；중심위착（제2부분）회경과활이，파동，재활이과정；중심위착이하적위착（제3부분）회선역백씨시량방향활이，연후개변운동방향진행반이，최후회도제5개위착적초시위치후연백씨시량활이。【결론】당정계위착수도외응력작용시，정계회마상와해，외응력시도치정계와해적주요인소。대비수평위착적정계，사배위착조성적정계와해불구유대칭성，매개위착적운동규률도각유특점。
[Objective]An evolution process of the annihilation of small angle grain boundaries dislocation was researched in nanocrystalline materials in this paper.[Methods]Through the a-nalysis of dislocation stress and the establishment of dynamics equations,the law of motion of grain boundary dislocations was studied under the external stress.[Results]For all of the in-clined dislocations,grain boundary dislocations can be divided into three parts.In the first part, the dislocation above middle dislocation slips,swings,and finally slips along with the vector di-rection in the process of shear stress increasing.In the second part,the middle dislocation slips, swings,and slides again.In the last part,the dislocation below middle dislocation slips firstly a-long inverse direction of the vector,then changes direction for climbing,and finally returns back to the position of the fifth dislocation and slips along with the vector.[Conclusion]The results show that grain boundary soon collapses when affected by external stress,which is the main factor that leads to grain boundary collapse.In comparison with horizontal dislocation of grain boundary,inclined dislocation of grain boundary collapse is not symmetry,and each of the dislo-cation motion has its characteristics.