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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2022.10
- 수록면
- 253 - 260 (8page)
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초록· 키워드
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In this study, the microstructural characteristics of a high-speed-extruded Mg-5Bi-3Al (BA53) alloy and its tensile, compressive, and high-cycle fatigue properties are investigated. The BA53 alloy is successfully extruded at a die-exit speed of 16.6 m/min without any hot cracking using a large- scale extruder for mass production. The homogenized BA53 billet has a large grain size of ~900 μm and it contains fine and coarse Mg₃Bi₂ particles. The extruded BA53 alloy has a fully recrystallized microstructure with an average grain size of 33.8 μm owing to the occurrence of complete dynamic recrystallization during high-speed extrusion. In addition, the extruded BA53 alloy contains numerous fine lath-type Mg₃Bi₂ particles, which are formed through static precipitation during air cooling after exiting the extrusion die. The extruded BA53 alloy has a high tensile yield strength of 175.1 MPa and ultimate tensile strength of 244.4 MPa, which are mainly attributed to the relative fine grain size and numerous fine particles. The compressive yield strength (93.4 MPa) of the extruded BA53 alloy is lower than its tensile yield strength, resulting in a tension-compression yield asymmetry of 0.53 High-cycle fatigue test results reveal that the extruded BA53 alloy has a fatigue strength of 110 MPa and fatigue cracks initiate at the surface of fatigue test specimens, indicating that the Mg₃Bi₂ particles do not act as fatigue crack initiation sites. Furthermore, the extruded BA53 alloy exhibits a higher fatigue ratio of 0.45 than other commercial extruded Mg-Al-Zn-based alloys.
목차
Abstract
1. 서론
2. 실험 방법
3. 결과 및 고찰
4. 결론
REFERENCES
참고문헌 (29)
참고문헌 신청
Z.B. Sajuri, Y. Miyashita, Y. Hosokai, Y. Mutoh, 2006, Effects of Mn content and texture on fatigue properties of as-cast and extruded AZ61 magnesium alloys, Int. J. Mech. Sci., Vol. 48, pp. 198–209. https://doi.org/10.1016/j.ijmecsci.2005.09.003
J.A. Liu, J. Wang, M.L. Yang, Y.M. Yao, 2021, Microstructure and Mechanical Properties of Mg–8Y–2Ho–2Zn Alloy with Long Period Stacking Ordered Phase, Met. Mater. Int., Vol. 27, pp. 1613–1619. https://doi.org/10.1007/s12540-019-00587-7
O. Sadeddin, M.M. 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
J.W. Cha, Y.J. Kim, Y.M. Kim, J.H. Bae, S.H. Park, 2022, Tensile and High-Cycle Fatigue Properties of Extruded AZ91–0.3Ca–0.2Y Alloy with Excellent Corrosion and Ignition Resistances, Met. Mater. Int., Vol. 28, pp. 385–396. https://doi.org/10.1007/s12540-021-01101-8
A. Afsharnaderi, M. Lotfpour, H. Mirzadeh, M. Emamy, M. Malekan, 2020, Enhanced mechanical properties of as-cast AZ91 magnesium alloy by combined RE-Sr addition and hot extrusion, Mater. Sci. Eng. A, Vol. 792, pp. 139817. https://doi.org/10.1016/j.msea.2020.139817
J.A. Liu, J. Wang, M.L. Yang, Y.M. Yao, 2021, Microstructure and Mechanical Properties of Mg–8Y–2Ho–2Zn Alloy with Long Period Stacking Ordered Phase, Met. Mater. Int., Vol. 27, pp. 1613–1619. https://doi.org/10.1007/s12540-019-00587-7
O. Sadeddin, M.M. 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
J.W. Cha, Y.J. Kim, Y.M. Kim, J.H. Bae, S.H. Park, 2022, Tensile and High-Cycle Fatigue Properties of Extruded AZ91–0.3Ca–0.2Y Alloy with Excellent Corrosion and Ignition Resistances, Met. Mater. Int., Vol. 28, pp. 385–396. https://doi.org/10.1007/s12540-021-01101-8
A. Afsharnaderi, M. Lotfpour, H. Mirzadeh, M. Emamy, M. Malekan, 2020, Enhanced mechanical properties of as-cast AZ91 magnesium alloy by combined RE-Sr addition and hot extrusion, Mater. Sci. Eng. A, Vol. 792, pp. 139817. https://doi.org/10.1016/j.msea.2020.139817
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