Hot deformation behavior and dynamic precipitation characteristics of Mg-Gd-Nd(-Sm)-Zr alloys
We deeply analyze the deformation behavior of Mg-Gd-Nd(-Sm)-Zr alloys under high temperature uniaxial compression, and explore the influence mechanism of Sm on the microstructure evolution of Mg-Gd-Nd-Zr alloy. We can draw the following conclusions: the addition of Sm delays the dynamic recrystalliz...
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| Autores principales: | , , , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
Elsevier
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/4682d5df8bb14f52b137afa60485c508 |
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| Sumario: | We deeply analyze the deformation behavior of Mg-Gd-Nd(-Sm)-Zr alloys under high temperature uniaxial compression, and explore the influence mechanism of Sm on the microstructure evolution of Mg-Gd-Nd-Zr alloy. We can draw the following conclusions: the addition of Sm delays the dynamic recrystallization of Mg-Gd-Nd-Zr alloy, resulting in the increase of stress and the decrease of machinability. There is no dynamic precipitation in Mg-Gd-Nd-Zr alloy at 400 °C/0.01 s−1/0.7, which is related to the high solute-vacancy binding energy of Nd. Under the same deformation condition, two kinds of dynamic precipitates with different size and shape appear in Mg-Gd-Nd-Sm-Zr alloy: fine particle phase and coarse lamellar phase. The two precipitates are Mg(Gd, Nd, Sm) with body-centered cubic structure, and are incoherent with the matrix. The coarse lamellar phase effectively hinders dislocation rearrangement, which explains the delay of dynamic recrystallization. |
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