MA법에 의한 V-Co계 비정질합금의 제조 및 구조분석
Fabrication and structural observation of amorphous V-Co alloy by mechanical alloying
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초록
본 연구에서는 출발원료로 σ-VCo 금속간화합물과 V50Co50 혼합분말을 각각 사용하여 기계적 합금화에 따른 비정질화 가능성을 조사하였다. X선 회절에 의해 얻어진 전구조인자 S(Q) 및 동경분포함수 RDF(r)의 결과로부터 볼밀링이진행됨에 따라 비정질상의 구조적 특징이 분명히 관찰되었다. 120시간 MA 처리에 의하여 두 경우 모두에서 비정질상이생성됨을 알 수 있었다. 60시간 동안 MA 처리한 V50Co50 분말시료의 열분석 에서는 약 600oC에 비정질상의 결정화에 의한발열 peak가 관찰되었다. X선 회절법에 의해 얻어진 전구조인자 및 동경분포함수의 분석으로부터 MA 시간에 따라 출발결정상은 비정질상의 특징적인 원자구조로 서서히 변화함을 알 수 있었다.
Abstract
In the present study, we investigated the effect of mechanical alloying (MA) on the formation of amorphous VCo system through solid state reaction during ball milling. Two types of powder samples, σ-VCo intermetallic compound and V50Co50 powder mixture, were applied as a starting materials. With increasing milling time, a structural characteristics into the amorphous state is distinctly observed from the structural factor and radial distribution by X-ray diffraction. Amorphization has been observed in all two types of samples after the milling for 120 hrs. DSC spectrum of V50Co50powder sample milled for 60 hrs indicates a sharp exothermic peak from the crystallization at 600oC. The structure factor,S(Q) and radial distribution function, RDF(r), observed by X-ray diffraction gradually change into a structure characteristic of an amorphous state with increasing MA time.
참고문헌 (14)
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