Microstructure evolution and mechanical properties of the Mg-Sm-Gd-Zn-Zr alloy during extrusion

Microstructure evolution and mechanical properties of the Mg-Sm-Gd-Zn-Zr alloy during extrusion
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Mg-Sm-Gd-Zn-Zr合金挤压过程中的显微组织演变和力学性能

DOI:
10.1016/j.jmrt.2021.09.080
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发表时间:
2021-11
期刊:
Journal of Materials Research and Technology
影响因子:
--
通讯作者:
Pan Fusheng
Pan Fusheng
中科院分区:
其他
文献类型:
--
作者:
Yuan Ming;He Chao;Zhao Jun;Yang Huabao;Song Yan;Lei Bin;Qian Xiaoying;Dong Zhihua;Li Qian;Jiang Bin;Pan Fusheng

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Mg-2.6Sm-1.3Gd-0.6Zn-0.5Zr(wt.%)合金用金属模铸造制备,然后在400°C下以25:1的挤压比热挤压。利用光学显微镜(OM)、扫描电子显微镜(SEM)、电子背散射衍射(EBSD)、X射线衍射(XRD)和透射电子显微镜(TEM)研究了挤压态合金的显微组织和力学性能。结果表明,挤压态合金发生了充分的动态再结晶,形成了稀土织构。挤压态合金在200°C时表现出时效硬化响应,基体中析出大量纳米级片状强化相β′。在峰值时效条件下的挤压态合金在室温下的极限拉伸强度、屈服强度和伸长率分别为332 MPa、220 MPa和22.7%。研究合金的主要强化机制是细晶强化、固溶强化和沉淀强化。
Mg-2.6Sm-1.3Gd-0.6Zn-0.5Zr (wt.%) alloy is prepared with metal mold casting and followed hot extruded at 400°C with the extrusion ratio of 25:1. Microstructure and mechanical properties of the as-extruded alloy are investigated using optical microscope (OM), scanning electron microscope (SEM) with electron backscatter diffraction (EBSD), X-ray diffraction (XRD) and transmission electron microscope (TEM). The results show that the as-extruded alloy is fully dynamically recrystallized, which develops rare earth (RE) texture component. The as-extruded alloy shows an age-hardening response at 200°C, in which there are numerous nano-scale plate strengthening phase β′ precipitated in the matrix. The as-extruded alloy in the peak-aged condition exhibits ultimate tensile strength, yield strength, and elongation of 332 MPa, 220 MPa and 22.7% at room temperature, respectively. The dominant strengthening mechanisms of the investigated alloy are fine-grain strengthening, solid solution strengthening and precipitate strengthening.
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