413 Zn-Al超塑性制振合金の微細組織制御(OS4-(4)オーガナイズドセッション《材料と組織》)

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As a typical superplastic metallic material, Zn-Al eutectoid alloy has been well known, where fine-grained microstructure required for the occurrence of superplasticity is obtained by solution treatment, water-quenching and subsequent aging at an elevated temperature such as 200℃. Recently thermo-mechanically controlled process (TMCP), where hot rolling is conducted under temperature control, has also been reported to provide a fine-grained microstructure. As the critical cooling rate in this technique is slower than in the above-mentioned traditional process, it can be applied to thick-gage components and product alloy plates have been employed as seismic damper in an actual high-rise building for protection from giant earthquakes. However, condition to obtain fine-grained microstructure and its mechanism has not elucidated yet. Hence in the present study, control conditions in hot rolling such as temperature, total number of passes, reduction in a pass, etc. have been investigated in a Zn-Al eutectoid alloy to obtain fine-grained microstructures. Homogenized ingot specimens were hot-rolled using conventional mill without a heating device from 20 to 2mm in thickness with 9 passes. The specimens were held at 260℃ for 30min before each pass, and water-quenched after the pass. Microstructural observation on the final sheet with 9 passes and that of 3mm thickness with 8 passes showed that equi-axed fine-grained microstructure with grain sizes of about 2μm was observed in the two sheets.
一般社団法人日本機械学会の論文
2010-08-27

413 Zn-Al超塑性制振合金の微細組織制御(OS4-(4)オーガナイズドセッション《材料と組織》)

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