발간논문

Home > KJMM 논문 > 발간논문

Vol.32, No.6, 724 ~ 729, 1994
Title
Structural characterization of Amorphous Cu - Ta Alloy Powders Prepared by High - Energy Ball Milling
이충효Chung Hyo Lee, 복영준청Toshiharu Fukunaga, 수곡우일랑Uichiro Mizutani
Abstract
The mechanism for the amorphization induced by mechanical alloying has been studied in the immiscible Cu-Ta system characterized by a positive heat of mixing of 2kJ/㏖. Here a chemical driving force is no longer expected and instead an energetically up-hill process has been proposed for the formation of the amorphous phase. From the studies on the atomic-level structure through the neutron diffraction and extended X-ray absorption fine structure coupled with thermodynamical consideration, we provide various evidences for the amorphization due to mechanical alloying for a mixture of Cu and Ta powders, The coordination number around Cu and Ta atoms is deduced by assuming the first neighbors of the total pair distribution function g(r) to consist of the three partial ones. We conclude that the amorphization proceeds such that the smaller Cu atoms preferentially enter into the bcc Ta lattice and destroy the long range order edtructure of a crystalline phase.
Key Words
| PDF
대한금속∙재료학회 │ (06633) 서울시 서초구 서초대로 56길 38 대한금속∙재료학회 회관 (서초1동 1666-12번지)
Tel : 070-4266-1646 │ FAX : 02-557-1080 │ E-mail : metal@kim.or.kr
Copyright ⓒ 2013 사단법인 대한금속∙재료학회 All rights reserved.