含钪铝硅合金熔炼工艺研究论文摘要

中北大学2011届毕业生毕业设计摘要1含钪铝硅合金熔炼工艺研究摘要为了提高702A铝合金的强韧性，通过控制熔炼工艺，确定702A铝合金最优化成分为（质量分数，%）：7Si,0.5Mg,0.1Mn,1.5Cu，经固溶处理和时效处理后，其力学性能能达到：σ=361MPa,δ=8.4%。以ZL702铸件的熔炼工艺为例，总结了钪在铝及铝合金中对合金组织、力学性能、热稳定性和抗腐蚀性能的影响。钪在铝合金中是有效的晶粒细化剂、再结晶抑制剂和改善焊接性能的添加剂；钪可以细化铝合金晶粒,提高合金的力学性能和再结晶温度,增强铝合金的热稳定性,改善铝合金的焊接性能和抗腐蚀性能；分析了钪在铝合金中的作用机理，介绍了铝硅合金熔炼工艺的应用的具体的工艺措施。关键词钪，铝合金，组织，性能中北大学2011届毕业生毕业设计摘要2TheSmeltingprocessresearchofAl-SialloycontainScAbstractInordertoimprovestrengthtoughnessof702Aaluminumalloy,throughcontrolofmeltingprocess,thedeterminedalloycompositionis(wt%)7Si,0.5Mg,0.1Mn,1.5Cu,Afterthesolutionheattreatmentandagingtreatment,themechanicalpropertiesof702Aaluminumalloyachieveσ=361MPa,δ=8.4%.TakingtheZL702Acastingsmeltingtechnologyastheexample,theeffectsofSconAlandAlalloy’smicrostructure,mechanicalproperties,thermalstabilityandanti-corrosionaresummarized.Sccanfinegrainsgreatly,inhibitalloy’srecrystallizationandraiserecrystallizationtemperature,andcanimprovealloy’sweldingpropertiesandanti-corrosioncapability.;themechanismbehindtheseeffectsisanalyzed.ThispaperintroducesthesmeltingtechnologyoftheAl-Sialloyinthefoundrywoeks,andtheconcretetechnologymeasures.KeywordsSc,Al-Sialloys,microstructure,properties