지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2022.12
- 수록면
- 344 - 350 (7page)
이용수
초록· 키워드
오류제보하기
Extruded Mg-Bi binary alloys are known to have an undesirable bimodal grain structure containing a large amount of coarse unrecrystallized grains. Accordingly, to improve the microstructural homogeneity of extruded Mg-Bi alloys, it is necessary to promote the dynamic recrystallization (DRX) behavior during hot extrusion. An effective way to promote DRX is an increase in nucleation sites for DRX through a pre-deformation process before extrusion, such as cold pre-forging and hot pre compression. However, the application of these pre deformation processes increase s the cost of final extruded Mg products because of an increase in energy consumption and decrease in productivity. Therefore, a low-cost new continuous process with high productivity is required to improve the microstructural homogeneity and mechanical properties of extruded Mg alloys without a drastic increase in the entire process cost. This study proposes a new extrusion method using an extrusion billet with a truncated cone shape (i.e., tapered billet) instead of a conventional extrusion billet with a cylindrical shape. When the hot extrusion of a Mg-5Bi alloy is conducted using the tapered billet, the DRX behavior during extrusion is considerably promoted. The DRX fraction and average grain size of the extruded alloy significantly increase and decrease from 65% to 91% and from 225 μm to 49 μm, respectively. Consequently, the extruded Mg-5Bi alloy fabricated using the tapered billet has a finer homogeneous grain structure and higher tensile elongation than the extruded counterpart fabricated using the cylindrical billet.
목차
Abstract
1. 서론
2. 실험 방법
3. 결과 및 고찰
4. 결론
REFERENCES
참고문헌 (19)
참고문헌 신청
F. Liu, X. Liu, B. Zhu, H. Yang, G. Xiao, M. Hu, 2022, Influence of Microstructure and Mechanical Properties on Formability in High Strain Rate Rolled AZ31 Magnesium Alloy Sheets, Met. Mater. Int., Vol. 28, pp. 1361–1371. https://doi.org/10.1007/s12540-021-00996-7
Y. Feng, Y. Yang, Z. Xiao, X. Meng, G. Zhou, J. Leng, X. Teng, 2022, Effect of Al on the Microstructure and Mechanical Properties of Mg–Sn–Ca–Mn Wrought Alloy, Met. Mater. Int., Vol. 28, pp. 1480–1487. https://doi.org/10.1007/s12540-021-01001-x
O. Sadeddin, M. Moazami-Goudarzi, M. J. Nayyeri, 2021, Effect of Hot Extrusion on Microstructure and Mechanical Properties of Mg–5Sn–xZr Alloys, Met. Mater. Int. Vol. 27, pp. 4996–5007. https://doi.org/10.1007/s12540-020-00919-y
S. H. Park, H. S. Kim, J. H. Bae, C. D. Yim, B. S. You, 2013, Improving the mechanical properties of extruded Mg–3Al–1Zn alloy by cold pre-forging, Scr. Mater., Vol. 69, pp. 250–253. https://doi.org/10.1016/j.scriptamat.2013.04.011
H. Wang, L. Zhang, W. Chen, D. Fang, W. Zhang, G. Cui, 2018, Improved tension/compression asymmetry achieved in high-strength magnesium alloys via compression-extrusion process, Mater. Sci. Eng. A, Vol. 736, pp. 239–247. https://doi.org/10.1016/j.msea.2018.08.110
Y. Feng, Y. Yang, Z. Xiao, X. Meng, G. Zhou, J. Leng, X. Teng, 2022, Effect of Al on the Microstructure and Mechanical Properties of Mg–Sn–Ca–Mn Wrought Alloy, Met. Mater. Int., Vol. 28, pp. 1480–1487. https://doi.org/10.1007/s12540-021-01001-x
O. Sadeddin, M. Moazami-Goudarzi, M. J. Nayyeri, 2021, Effect of Hot Extrusion on Microstructure and Mechanical Properties of Mg–5Sn–xZr Alloys, Met. Mater. Int. Vol. 27, pp. 4996–5007. https://doi.org/10.1007/s12540-020-00919-y
S. H. Park, H. S. Kim, J. H. Bae, C. D. Yim, B. S. You, 2013, Improving the mechanical properties of extruded Mg–3Al–1Zn alloy by cold pre-forging, Scr. Mater., Vol. 69, pp. 250–253. https://doi.org/10.1016/j.scriptamat.2013.04.011
H. Wang, L. Zhang, W. Chen, D. Fang, W. Zhang, G. Cui, 2018, Improved tension/compression asymmetry achieved in high-strength magnesium alloys via compression-extrusion process, Mater. Sci. Eng. A, Vol. 736, pp. 239–247. https://doi.org/10.1016/j.msea.2018.08.110
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