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17.01.2022 | Letter

Exceptional thermal stability of ultrafine-grained long-period stacking ordered Mg alloy

verfasst von: Shuai-Jun Ding, Li-Dong Xu, Xue-Cheng Cai, Shen-Xiang-Yu Gu, Kang-Kang Wen, Hui Yu, Zheng Chen, Bao-Ru Sun, Sheng-Wei Xin, Tong-De Shen

Erschienen in: Rare Metals | Ausgabe 5/2022

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The hierarchical long-period stacking ordered (LPSO) architecture composed mainly of an ultrafine-grained LPSO matrix has been demonstrated to be a feasible design strategy for achieving ultra-strong Mg alloys. Here, we report an exceptional thermal stability of the ultra-strong ultrafine-grained LPSO alloy. The ultrafine-grained LPSO alloy shows limited grain growth up to 450 °C (~ 0.78 T_m, where T_m is the melting point of pure Mg) for 100 h. Grain boundary (GB) migration is observed to be kinetically inhibited by the high-density nanoparticles (NPs) located at the GBs. Additionally, the thermodynamic driving force for grain growth can be effectively reduced by the segregation of Zn to GBs. The exceptional thermal stability is thus attributed to the combined effects of kinetics (NPs pinning) and thermodynamics (GB energy reduction via Zn segregation), enabling the present UFG LPSO alloy to operate at high temperatures. …

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Titel: Exceptional thermal stability of ultrafine-grained long-period stacking ordered Mg alloy
verfasst von: Shuai-Jun Ding
Li-Dong Xu
Xue-Cheng Cai
Shen-Xiang-Yu Gu
Kang-Kang Wen
Hui Yu
Zheng Chen
Bao-Ru Sun
Sheng-Wei Xin
Tong-De Shen
Publikationsdatum: 17.01.2022
Verlag: Nonferrous Metals Society of China
Erschienen in: Rare Metals / Ausgabe 5/2022
Print ISSN: 1001-0521
Elektronische ISSN: 1867-7185
DOI: https://doi.org/10.1007/s12598-021-01889-9

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