材料工程2026，Vol.54Issue(2)：198-211,14.DOI:10.11868/j.issn.1001-4381.2025.000308
Al-Si-Mg-Sc-Zr-Sb合金成分设计与铸态微观组织
Composition design and as-cast microstructure of Al-Si-Mg-Sc-Zr-Sb alloy
樊振中 1柯先军 2姬广靖 3李姚江 2田艳中 4黄敏1
作者信息
- 1. 中国航发北京航空材料研究院,北京 100095||北京市先进铝合金材料及应用工程技术研究中心,北京 100095
- 2. 四川航天川南火工技术有限公司,四川 泸州 646099
- 3. 四川仨川航空科技股份有限公司,成都 610511
- 4. 东北大学 材料科学与工程学院,沈阳 110167
- 折叠
摘要
Abstract
Al-Si-Mg-Sc-Zr alloys are prepared through phase diagram design and the smelting process.The effect of elemental addition levels on solidification parameters is investigated.Additionally,the room-temperature tensile properties and microstructure of the as-cast alloys are thoroughly analyzed.The results reveal that the as-cast microstructure consists of α-Al matrix,Al-Si eutectic phase,Mg₂Si phase,Al₃Zr phase,and Al₃(Sc,Zr)phase.Silicon has the most pronounced effect on the tensile strength,whereas magnesium primarily influences the secondary dendrite arm spacing(SDAS).The liquidus temperature gradually decreases with an increase in silicon content,and the solidus temperature continuously drops as the magnesium content rises.With the addition of the Sb element,the morphology of the eutectic silicon phase transforms from needle-like and long-striped shapes to short rod-shaped or worm-shaped forms,and its aspect ratio decreases from 8.19 to 3.31.The fine-sized Al₃Zr and Al₃(Sc,Zr)phases refine the grain size from 272 μm to 224 μm.As a result,the ultimate tensile strength and yield strength reach 211 MPa and 125 MPa,respectively,with an elongation of approximately 5.1％.The enhancement of mechanical properties is attributed to the fine-grained strengthening of the Al₃Zr and Al₃(Sc,Zr)phases,as well as the second-phase strengthening effect of the eutectic silicon phase.As the addition of silicon and magnesium elements increases,the fracture mechanism shifts from a combination of intergranular and dimple fractures to purely intergranular fractures.关键词
相图设计/Al-Si-Mg-Sc-Zr-Sb合金/物相分析/显微组织/力学性能Key words
phase diagram design/Al-Si-Mg-Sc-Zr-Sb alloy/phase analysis/microstructure/mechanical property分类
矿业与冶金引用本文复制引用
樊振中,柯先军,姬广靖,李姚江,田艳中,黄敏..Al-Si-Mg-Sc-Zr-Sb合金成分设计与铸态微观组织[J].材料工程,2026,54(2):198-211,14.
