Microstructure and Mechanical Properties of High-Silicon Heat-Resistant Mg-9Al-3Si Magnesium Alloy by Rapid Solidification and Hot Extrusion Processes
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摘要: 镁合金的屈服强度低、耐热性能差,限制了其应用推广。本研究通过结合快速凝固与热挤压工艺,制备高硅Mg-9Al-3Si耐热镁合金,随后对其组织和力学性能进行研究。结果表明,Mg-9Al-3Si铸锭经快速凝固后,晶粒被细化,细小Mg2Si相的分布得到显著改善。快速凝固挤压Mg-9Al-3Si棒表现出弱的织构,其(0001) 基面最大织构强度仅为4.61。快速凝固Mg-9Al-3Si挤压棒的抗拉强度、屈服强度及伸长率在室温下分别为403.0 MPa、353.0 MPa及12%,在150 ℃下分别是203.0 MPa、199.0 MPa和27%,在200 ℃下分别为119.0 MPa、110.0 MPa和30%,其高温强度特别是150 ℃的屈服强度优异。
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关键词:
- Mg-9Al-3Si高强镁合金 /
- 快速凝固 /
- 挤压工艺 /
- 高温性能
Abstract: Low yield strength and poor heat resistance are two major obstacles to the application promotion of magnesium alloys. In this study, heat-resistant high silicon Mg-9Al-3Si magnesium alloy with excellent high temperature performances is prepared by combining rapid solidification and hot extrusion processes, and its microstructure and mechanical properties are investigated. Results show that the grains of the rapidly solidified Mg-9Al-3Si ingot are refined, and that the distribution of the fine Mg2Si phase is greatly improved. The rapidly solidified Mg-9Al-3Si extruded magnesium alloy also exhibits a weak texture with a maximum textural strength of only 4.61 in the (0001) basal plane. The tensile strength, yield strength and elongation of the rapidly solidified Mg-9Al-3Si extruded magnesium alloy are 403.0 MPa, 353.0 MPa and 12% at room temperature, 203.0 MPa, 199.0 MPa and 27% at 150 ℃, and 119.0 MPa, 110.0 MPa and 30% at 200 ℃. The high-temperature strengths, especially the yield strength at 150 ℃, are excellent. -
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