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17-01-2022 | Letter

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

Authors: 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

Published in: Rare Metals | Issue 5/2022

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摘要

构筑由超细晶长周期堆垛有序结构 (LPSO) 组成的层级结构镁合金是一种获得超高强度的可行设计策略。本研究报道了这种超强超细晶LPSO合金极其优异的热稳定性, 该合金在高达450 ℃(约镁熔点0.78倍) 时退火100 h后晶粒长大极其有限。高密度的纳米颗粒从动力学上抑制了晶界迁移, 另外锌元素的晶界偏析可以有效地降低晶粒长大的热力学驱动力。因此, 该合金超高的热稳定性可归因于动力学(纳米颗粒钉扎)和热力学 (锌偏析导致的晶界能下降) 的协同作用, 使得这种层级结构超细晶LPSO合金可以在高温下服役。

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Title: Exceptional thermal stability of ultrafine-grained long-period stacking ordered Mg alloy
Authors: 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
Publication date: 17-01-2022
Publisher: Nonferrous Metals Society of China
Published in: Rare Metals / Issue 5/2022
Print ISSN: 1001-0521
Electronic ISSN: 1867-7185
DOI: https://doi.org/10.1007/s12598-021-01889-9

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摘要

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