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Improved oxidation resistance of Mg-9Al-1Zn alloy microalloyed with 60 wt ppm Be attributed to the formation of a more protective (Mg,Be)O surface oxide
Corrosion Science ( IF 8.3 ) Pub Date : 2018-03-01 , DOI: 10.1016/j.corsci.2018.01.006
Qiyang Tan , Ning Mo , Chih-Ling Lin , Bin Jiang , Fusheng Pan , Han Huang , Andrej Atrens , Ming-Xing Zhang

The oxidation resistance of Mg-9A1-1Zn alloy (AZ91) was significantly improved through microalloying with 60 ppm Be. Be reinforced the initially formed oxide layer on the alloy surface by (i) the formation of a (Mg,Be)O solid solution due to the Be enrichment; and (ii) the refined gains of the (Mg,Be)O. During high-temperature oxidation, the reinforced (Mg,Be)O layer provided sufficient strength to withstand the internal stresses and the Mg vaporisation, and therefore delayed the oxide layer cracking and debonding from the substrate. In addition, the initial oxidation rates of AZ91. and Be-containing AZ91 were closely related to surface roughness.

中文翻译:

含 60 wt ppm Be 微合金化 Mg-9Al-1Zn 合金的抗氧化性提高归因于形成更具保护性的 (Mg,Be)O 表面氧化物

Mg-9A1-1Zn 合金(AZ91)的抗氧化性通过微合金化与 60 ppm Be 显着提高。通过 (i) 由于 Be 富集形成 (Mg,Be)O 固溶体来增强合金表面最初形成的氧化层;(ii) (Mg,Be)O 的精制增益。在高温氧化过程中,增强的 (Mg,Be)O 层提供了足够的强度来承受内应力和 Mg 蒸发,因此延迟了氧化层开裂和从基材上剥离。此外,AZ91 的初始氧化速率。和含Be AZ91 与表面粗糙度密切相关。
更新日期:2018-03-01
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