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Aowen Wang, Xiaoya Chen, Quanan Li, Zheng Wu, Limin Zhu, Hongxi Zhu, and Huanju He, Hot deformation behavior and microstructure evolution of Mg–Gd–Sm(–Zn)–Zr alloy, Int. J. Miner. Metall. Mater.,(2025). https://dx.doi.org/10.1007/s12613-024-2982-9
Aowen Wang, Xiaoya Chen, Quanan Li, Zheng Wu, Limin Zhu, Hongxi Zhu, and Huanju He, Hot deformation behavior and microstructure evolution of Mg–Gd–Sm(–Zn)–Zr alloy, Int. J. Miner. Metall. Mater.,(2025). https://dx.doi.org/10.1007/s12613-024-2982-9
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Mg–Gd–Sm(–Zn)–Zr合金的热变形行为及组织演变

摘要: 采用Gleeble-1500D热模拟机对Mg–5Gd–3Sm–(1Zn) –0.5Zr合金进行不同变形条件下的热压缩实验，建立本构方程和热加工图；利用电子背散射衍射（EBSD）和透射电镜（TEM）技术分析了Mg–5Gd–3Sm(–1Zn)–0.5Zr合金热压缩变形后的动态再结晶（DRX）和动态析出。结果表明：Mg–5Gd–3Sm–(1Zn) –0.5Zr两种合金的应力应变曲线均表现出明显的加工硬化和动态再结晶特征，流变应力随着变形温度的升高和应变速率的降低而降低，且Mg–5Gd–3Sm–1Zn–0.5Zr合金的流变应力普遍高于Mg–5Gd–3Sm–0.5Zr合金；Zn元素的存在促进了DRX的产生，显著降低了0001面织构的强度，提高了非基面滑移的施密特因子。Mg–5Gd–3Sm–0.5Zr合金动态再结晶程度较低，表现为晶界处的单层DRX晶粒，并受不连续DRX机制支配。Mg–5Gd–3Sm–1Zn–0.5Zr合金动态再结晶程度较高，其主要机制是连续DRX，以多层DRX晶粒的形式出现。与Mg–5Gd–3Sm–0.5Zr合金相比，Mg–5Gd–3Sm–1Zn–0.5Zr合金中除了Mg5(GdSm)相，还引入了一种新的动态析出相，称为(MgZn)3(GdSm)相。动态析出相阻止了晶界迁移和位错运动，促进了DRX形核，阻止了再结晶晶粒的长大。

 

Hot deformation behavior and microstructure evolution of Mg–Gd–Sm(–Zn)–Zr alloy

Abstract: The dynamic recrystallization (DRX) and dynamic precipitation of Mg–5Gd–3Sm(–1Zn)–0.5Zr alloy after hot compression deformation were analyzed by electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) techniques. Furthermore, the DRX mechanisms were investigated by calculated the deformation activation energy, established the constitutive equation, and created a critical strain model. The results indicate that the presence of Zn element enhanced the production of DRX, considerably reduced the strength of 0001 plane texture, and boosted the Schmidt factor of nonbasal plane slip. The Mg–5Gd–3Sm–0.5Zr alloy had a low degree of DRX, manifested as a monolayer of DRX grains at the grain boundaries and dominated by the discontinuous DRX mechanism. However, the Mg–5Gd–3Sm–1Zn–0.5Zr alloy had a high degree of DRX, which occurred in the form of multilayered DRX grains by the main mechanism of continuous DRX. Compared with the Mg–5Gd–3Sm–0.5Zr alloy, in addition to the Mg5(Gd,Sm) phase, the Mg–5Gd–3Sm–1Zn–0.5Zr alloy also introduced a new dynamic precipitation phase called (Mg,Zn)3(Gd,Sm) phase. The dynamic precipitation phase prevented grain boundary migration and dislocation motion, which promoted DRX nucleation and prevented the growth of recrystallized grains.

 

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