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含块状长周期堆垛有序（LPSO）相和不含块状LPSO相的Mg-Gd-Y-Zn合金的热变形行为及特性比较

Comparison of Thermal Deformation Behavior and Characteristics of Mg-Gd-Y-Zn Alloys with and without Bulk LPSO Phase.

作者信息

Chen Dongjie, Wang Qi, Zhang Liang, Li Ting, Yuan Jiawei, Shi Guoliang, Wang Xinyu, Zhang Kui, Li Yongjun

机构信息

School of Architecture and Civil Engineering, Huanghuai University, Zhumadian 463000, China.

Guobiao (Beijing) Testing & Certification Co., Ltd., Beijing 100088, China.

出版信息

Materials (Basel). 2023 Aug 30;16(17):5943. doi: 10.3390/ma16175943.

DOI:10.3390/ma16175943
PMID:37687637
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10488359/
Abstract

Alloys Mg-8Gd-4Y-0.6Zn-0.5Zr (referred to as 0.6Zn) without the bulk long-period stacking ordered (LPSO) phase and Mg-8Gd-4Y-1.1Zn-0.5Zr (referred to as 1.1Zn) containing the bulk LPSO phase were prepared and a series of hot compression tests were conducted to examine and evaluate the influence of the bulk LPSO phase on the thermal deformation behavior and characteristics of the Mg-Gd-Y-Zn-Zr alloy. The bulk LPSO phase affects the dynamic recrystallization behavior, resulting in differences in flow stress between two alloys under different conditions. Specifically, in the temperature range of 380460 °C, compression at lower strain rates is beneficial for the LPSO phase to promote dynamic recrystallization, while compression at a high strain rate inhibits the dynamic recrystallization due to the severe deformation of the bulk LPSO phase to release the stress concentration instead. The increase in temperature helps the LPSO promote dynamic recrystallization. As a result, the LPSO phase promotes dynamic recrystallization at all experimental strain rates at 500 °C. Furthermore, the thermal processing maps of the 0.6Zn and 1.1Zn alloys are established, and their optimal processing windows are located at 500 °C/0.0010.01 s and 500 °C/0.01 s, respectively. In addition, the instability zones for the 1.1Zn alloy are much larger than that for the 0.6Zn alloy, which corresponds to the microcracks generated at the interfaces between α-Mg and bulk LPSO phases.

摘要

制备了不含大量长周期堆垛有序（LPSO）相的Mg-8Gd-4Y-0.6Zn-0.5Zr合金（简称0.6Zn）和含有大量LPSO相的Mg-8Gd-4Y-1.1Zn-0.5Zr合金（简称1.1Zn），并进行了一系列热压缩试验，以研究和评估大量LPSO相对Mg-Gd-Y-Zn-Zr合金热变形行为及特性的影响。大量LPSO相影响动态再结晶行为，导致两种合金在不同条件下的流变应力存在差异。具体而言，在380460 °C温度范围内，较低应变速率下的压缩有利于LPSO相促进动态再结晶，而高应变速率下的压缩则由于大量LPSO相的严重变形以释放应力集中而抑制动态再结晶。温度升高有助于LPSO相促进动态再结晶。因此，在500 °C时，LPSO相在所有实验应变速率下均促进动态再结晶。此外，建立了0.6Zn和1.1Zn合金的热加工图，它们的最佳加工窗口分别位于500 °C/0.0010.01 s和500 °C/0.01 s。此外，1.1Zn合金的不稳定区比0.6Zn合金的大得多，这与α-Mg和大量LPSO相界面处产生的微裂纹相对应。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8587/10488359/1d27df2d4c75/materials-16-05943-g011.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8587/10488359/4b955564446d/materials-16-05943-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8587/10488359/7276b8530459/materials-16-05943-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8587/10488359/1d27df2d4c75/materials-16-05943-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8587/10488359/0bfd76bb28d4/materials-16-05943-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8587/10488359/3500da4c7965/materials-16-05943-g002.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8587/10488359/a054320d8eef/materials-16-05943-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8587/10488359/9f932c518631/materials-16-05943-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8587/10488359/4b955564446d/materials-16-05943-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8587/10488359/7276b8530459/materials-16-05943-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8587/10488359/1d27df2d4c75/materials-16-05943-g011.jpg

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