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LPSO 和 SFs 对 Mg-Gd-Y-Zn-Zr 合金组织演变和力学性能的影响。

Effect of LPSO and SFs on microstructure evolution and mechanical properties of Mg-Gd-Y-Zn-Zr alloy.

机构信息

School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China.

Research Center for Advanced Magnesium Technology, Nagaoka University of Technology, Nagaoka 940-2188, Japan.

出版信息

Sci Rep. 2017 Jan 30;7:40846. doi: 10.1038/srep40846.

DOI:10.1038/srep40846
PMID:28134297
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5278355/
Abstract

High performance Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr alloy with high strength and excellent ductility has been successfully developed by hot extrusion. The effect of plate-shaped long period stacking ordered (LPSO) phases and solute-segregated stacking faults (SFs) on the dynamically recrystallization (DRX) behavior was analyzed. The plate-shaped LPSO phases stimulate the DRX by particle stimulated nucleation mechanism, leading to higher DRX ratio and weaker basal texture. While for the alloy with dense fine SFs inside the original grains, discontinuous DRX initially occurs at the original grain boundaries, and the DRX is obviously restricted. Consequently, alloy containing dense SFs exhibits higher strength but lower ductility compared with alloy with plated-shaped LPSO phases.

摘要

通过热挤压成功开发出具有高强度和优异延展性的高性能 Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr 合金。分析了板状长周期堆垛有序（LPSO）相和溶质偏析层错（SFs）对动态再结晶（DRX）行为的影响。板状 LPSO 相通过颗粒诱发形核机制刺激 DRX，导致更高的 DRX 比和更弱的基面织构。而对于原始晶粒内存在密集细小 SFs 的合金，最初在原始晶界发生不连续的 DRX，DRX 受到明显限制。因此，与具有板状 LPSO 相的合金相比，含有密集 SFs 的合金表现出更高的强度和更低的延展性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0d6b/5278355/9e0f8efa8859/srep40846-f8.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0d6b/5278355/9e0f8efa8859/srep40846-f8.jpg

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