발간논문

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Vol.14, No.5, 454 ~ 463, 1976
Title
Electron Microscopic Observations of the Precipitates in the Beryllium copper Alloy
유연철Yeon Chul Yoo, 강일구Il Koo Kang, 최주Ju Choi
Abstract
The aging characteristics of Cu-1.8%Be-0.2%Co alloy have been studied by hardness measurement and transmission electron microscopy. The zone formed in the early stage of aging was considered to be beryllium rich GP I zone which is characterized by the continuous long streaks in the <100>, <110> directions in the selected area diffraction pattern. Further aging produced discontinuous streaks with the several intensity maxima. This stage may correspond to GP II zone. To explain the maximum density points, a model is proposed that a Be rich atomic layer lies in about every third plane of the matrix lattice planes. Aging at higher temperatures caused superlattice reflections of CuAu (I) type γ` to appear The final equilibrium precipitate was identified to be body centered cubic γ. GP I , GP II and γ` are fully coherent with the matrix. Furthermore the alloy shows the maximun hardness when GP II coexists with γ`.
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