등통로각압축(ECAP)과 쌍정 생성을 통한 Zr의 입자 미세화와 강도 향상

초록

Zirconium of a hexagonal close packed a phase was grain-refined through two independent methods, cold rolling that generates a high density of twins and equal channel angular pressing. Random grain boundaries and twin boundaries produced by the two respective methods, as confirmed by TEM and EBSD, divided the microstructure into regions of 270㎚ and 15㎛, respectively. As a result of the grain refinement, the hardness and the compressive yield strength increased, the trend of which conformed to the Hall-Petch equation, thereby asserting the effectiveness of both type of boundaries in resisting the onset of plastic deformation.