Phase Transformation in Al/Zn Multilayers during Mechanical Alloying

C Chen and JJ Yu and JY Lu and J Zhang and X Su and CH Qian and YL Chen and WX Ji and MP Liu, ACTA METALLURGICA SINICA-ENGLISH LETTERS, 36, 1709-1718 (2023).

DOI: 10.1007/s40195-023-01586-9

In this work, mechanical alloying of the alternating stacked pure Al and Zn thin foils was accomplished via high-pressure torsion (HPT). In the alloyed Al-Zn system, an exotic phase transformation from hexagonal close-packed (HCP) to face- centered cubic (FCC) was identified. The atomic-scale evolution process and underlying mechanism of phase transformation down to atomic scale are provided by molecular dynamics simulation and high-resolution transmission electron microscopy. The HCP ? FCC phase transformation was attributed to the sliding of Shockley partial dislocations generated at the Al-Zn grain boundaries, which resulted in an 2110/011 and (0001)/(111) orientation relationship between the two phases. This work provides a new approach for the in- depth study of the solid phase transformation of Al-Zn alloys and also shed lights on understanding the mechanical properties of the HPT processed Al-Zn alloys.

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