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Outstanding fatigue performance of Mg-Gd-Zn-Zr alloy enriched with SFs rather than LPSO Structure
Journal of Magnesium and Alloys ( IF 15.8 ) Pub Date : 2024-12-04 , DOI: 10.1016/j.jma.2024.11.018 Yao Chen, Fulin Liu, Yujuan Wu, Liming Peng, Lang Li, Chao He, Qiang Chen, Yongjie Liu, Qingyuan Wang
Journal of Magnesium and Alloys ( IF 15.8 ) Pub Date : 2024-12-04 , DOI: 10.1016/j.jma.2024.11.018 Yao Chen, Fulin Liu, Yujuan Wu, Liming Peng, Lang Li, Chao He, Qiang Chen, Yongjie Liu, Qingyuan Wang
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Both solute-segregated long-period stacking ordered (LPSO) structure and stacking faults (SFs) are essential in strengthening rare-earth (RE) Mg alloys. Herein, LPSO-enriched Mg and SFs-enriched Mg are fabricated and comparably investigated for fatigue performances. During fatigue, the Mg nanolayers between LPSO lamellae or SFs act as the gliding channels of dislocations. However, SFs-enriched Mg exhibits outstanding fatigue strength due to solute strengthening within Mg nanolayers. Solute strengthening is assumed to contribute to the local accumulation of basal dislocations and the activation of non-basal dislocations. Dislocations are restricted locally and cannot glide long distances to specimen surfaces, which mitigates fatigue-induced extrusions and slip markings, ultimately leading to an increase in fatigue strength. These findings guide the development of RE-Mg alloys towards a synergy between high tensile and high fatigue performances.
中文翻译:
富含 SF 而不是 LPSO 结构的 Mg-Gd-Zn-Zr 合金的出色疲劳性能
溶质偏析长周期堆叠有序 (LPSO) 结构和堆叠缺陷 (SF) 对于强化稀土 (RE) 镁合金都是必不可少的。在此,制造了富含 LPSO 的 Mg 和富含 SFs 的 Mg,并对疲劳性能进行了比较研究。在疲劳过程中,LPSO 薄片或 SF 之间的 Mg 纳米层充当位错的滑动通道。然而,由于 Mg 纳米层内的溶质强化,富含 SFs 的 Mg 表现出出色的疲劳强度。溶质强化被认为有助于基底位位的局部积累和非基底位位的激活。位错受到局部限制,不能长距离滑行到试样表面,这减轻了疲劳引起的挤压和滑移痕迹,最终导致疲劳强度增加。这些发现指导了 RE-Mg 合金的开发,以实现高拉伸和高疲劳性能之间的协同作用。
更新日期:2024-12-05
中文翻译:
![](https://scdn.x-mol.com/jcss/images/paperTranslation.png)
富含 SF 而不是 LPSO 结构的 Mg-Gd-Zn-Zr 合金的出色疲劳性能
溶质偏析长周期堆叠有序 (LPSO) 结构和堆叠缺陷 (SF) 对于强化稀土 (RE) 镁合金都是必不可少的。在此,制造了富含 LPSO 的 Mg 和富含 SFs 的 Mg,并对疲劳性能进行了比较研究。在疲劳过程中,LPSO 薄片或 SF 之间的 Mg 纳米层充当位错的滑动通道。然而,由于 Mg 纳米层内的溶质强化,富含 SFs 的 Mg 表现出出色的疲劳强度。溶质强化被认为有助于基底位位的局部积累和非基底位位的激活。位错受到局部限制,不能长距离滑行到试样表面,这减轻了疲劳引起的挤压和滑移痕迹,最终导致疲劳强度增加。这些发现指导了 RE-Mg 合金的开发,以实现高拉伸和高疲劳性能之间的协同作用。