Ta/Zr接合界面部における相変態挙動 : Zrとステンレス鋼の異材接合に関する研究(第5報)

概要

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The phase transformation at Ta/Zr interface in the diffusion or explosive bonded joint was clarified by employing Zr-Ta binary alloys which were synthesized the bonding interface region between Ta and Zr. Zr-10 mass% Ta and Zr-20 mass% Ta binary alloys were used for the hardness test and microstructural analyses after Formastor-testing and laser surface melting. The cooling rates of Zr-Ta alloys were varied from 0.1 (furnace cooling) to 5.3 × 10^5 K/s (laser treating). TEM observation and X-ray diffraction analyses revealed that Ta and α-Zr were identified at the cooling rates up to about 10 K/s, and that ω-Zr as well as Ta was precipitated at the cooling rates between about 100 and 10^4 K/s. The rapidly cooled alloys (cooling rate exceeded about 10^5 K/s) were transformed to the single phase of α^'- (Zr, Ta) supersaturation solid solution (martensite). The hardness of Zr-Ta alloys indicated the highest value on the condition that both Ta and ω-Zr were precipitated. It could be concluded that the severe embrittlement at Ta/Zr explosive bonded interface was due to the precipitation of Ta and ω-Zr attended with the phase transformation in Zr-Ta system.
社団法人溶接学会の論文
1999-02-05