Multi-Dimensional Quantitative Analysis of Precipitates in the Hot-Rolled Al-1%Mn Alloy

Seiichiro Ii; Ken-ichi Ikeda; Toru Hara

doi:10.2320/matertrans.mt-l2026006

Journal article Multi-Dimensional Quantitative Analysis of Precipitates in the Hot-Rolled Al-1%Mn Alloy

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Seiichiro Ii, Ken-ichi Ikeda, Toru Hara. Multi-Dimensional Quantitative Analysis of Precipitates in the Hot-Rolled Al-1%Mn Alloy. MATERIALS TRANSACTIONS. 2026, 67 (9), MT-L2026006. https://doi.org/10.2320/matertrans.mt-l2026006

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Precipitates formed during the hot rolling process of the 1050 Al-1 mass% Mn alloy were quantitatively characterized by three-dimensional (3D) analysis. The 3D image was reconstructed using a serial sectioning technique that combined a focused ion beam and scanning electron microscopy. In the reconstructed 3D volume, 11186 precipitates were identified, and the size distribution was well explained by a log-normal distribution. In addition, we evaluated the precipitates observed in a two-dimensional (2D) SEM image extracted from the 3D volume and by scanning transmission electron microscopy observation of a specimen fabricated from the serially sectioned sample, enabling observation of the same region. Based on the data obtained from the 2D and 3D images, the average precipitate size measured from the 2D images was much smaller than that measured from the 3D images. This difference is attributed to the morphological anisotropy caused by hot rolling. Furthermore, we examined the effect of the number of analyzed precipitates on the average size and distribution. The average size depended significantly on the number of analyzed precipitates, indicating that a minimum number of precipitates is required for quantitative analysis. Moreover, we statistically evaluated the normality of the logarithmic size distribution using a quantile–quantile plot.

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