钪对铸态Al-Cu-Mg-Ag-Zr合金组织与性能影响
Journal Title: Science Paper Online - Year 2009, Vol 4, Issue 4
Abstract
采用熔炼铸造方法，制备了不同Sc含量的Al-Cu-Mg-Ag-Zr合金。通过金相、扫描电镜、透射电镜、性能测试等实验方法，研究了Sc对铸态Al-5.3Cu-0.8Mg-0.6Ag-0.2Zr（质量分数，%）合金的组织和性能影响。结果表明，添加0.10 %～0.5 % Sc后，在室温到300 ℃测试范围内，合金的室温拉伸强度、高温耐热性能及晶界腐蚀性能得到了改善。添加0.3%～0.5%Sc明显细化铸态合金的晶粒，晶粒尺寸从平均300 μm降低到60 μm。同时，添加0.3 % Sc有助于提高铸态合金的室温与高温拉伸强度，改善合金的抗腐蚀性能。含0.3% Sc的Al-5.3Cu-0.8Mg-0.6Ag-0.2Zr合金的力学性能得到提高的原因是由于细晶强化、固溶强化、时效强化、弥散强化及晶界强化共同作用的结果。同时研究也表明，当合金中同时添加0.5% Sc时，铸态合金中形成了粗大的Al3(Sc, Zr)相稀土化合物相，这种化合物相严重降低了合金的拉伸性能与抗腐蚀性能。
Authors and Affiliations
Daihong Xiao, Min Song, Fuqin Zhang, Kanghua Chen
Keywords
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