논문 해외 국제전문학술지(SCI급) STRUCTURAL EVOLUTION AND PHASE FORMATION IN COLD-ROLLED ALUMINUM–NICKEL MULTILAYERS
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2001-04
- 저자명 H. SIEBER1 , J. S. PARK2 , J. WEISSMU¨ LLER3 and J. H. PEREPEZKO2 †
- 학술지명 Acta mater
- 발행처명 ELSEVIER
- 발행국가 해외
- 논문언어 외국어
- 전체저자수 5
홈페이지
논문 초록 (Abstract)
Multilayer samples of nickel and aluminum with the compositions of Al–20 at% Ni and Al–25 at% Ni were prepared by the repeated folding and cold rolling (F&R) of elemental foils. Characterization by X-ray diffraction, scanning electron microscopy and transmission electron microscopy/selected-area electron diffraction reveals that the rolling procedure results in a decrease in thickness of the elemental layers to below 0.1 μm and a reduction in grain size to below 50 nm, but does not induce formation of an intermediate phase. Differential scanning calorimetry (DSC) measurements on samples subjected to different numbers of F&R cycles show double exotherms related to an initial nucleation and lateral growth and a subsequent thickening of reactively formed Al3Ni. The DSC data agree qualitatively with predictions of an existing kinetic model for multilayer reactions, but a decisively improved quantitative fit is obtained when a distribution of layer spacings is considered, rather than a well-defined modulation wavelength. The modified kinetic model can be inverted to yield information on the evolution of the distribution of layer sizes during deformation from DSC data.