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Furukawa Review No.26

Designing High-Strength Copper Alloys Based on the Crystallographic Structure of Precipitates

Hidemichi Fujiwara


We have developed a technique for advancing the design of precipitation hardened copper alloys using calculations to extract, from a crystallographic data base, those elements and compounds capable of acting as the precipitate phase, and we have verified experimentally the results of those calculations. We have found that in those alloys in which the compounds that were identified by calculation as those in which precipitation would occur during the aging process, precipitation did occur on the habit plane that was predicted by calculation, and precipitation hardening behavior was clearly exhibited. By also taking account of considerations of solid mechanics it has been possible to predict strength after aging, raising the expectation of integrating precipitate (i.e., the alloy system) selection with design for afteraging strength.

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