首页|Sc和Si相互作用对铸造Al-Si-Sc合金组织和性能的影响

Sc和Si相互作用对铸造Al-Si-Sc合金组织和性能的影响

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通常在铸造Al-Si合金加入Sc来改善合金的性能，但是Si和Sc的相互作用对合金组织和性能影响仍需要进一步深入研究。本文研究了不同含量的Si和Sc对合金组织和性能的影响，结果表明，Sc通过原位形成初生Al3Sc作为α-Al异质形核质点从而细化α-Al晶粒;在凝固过程中，共晶反应生成了网格状AlSi2Sc2相，包晶反应形成了块状AlSi2Sc2相;两种AlSi2Sc2相都会消耗合金中Sc原子，从而降低了Al3Sc的细化效果;Sc还变质共晶Si为更有序的纤维/片状结构，适当的Si与Sc的比可以避免AlSi2Sc2的形成;Al-6Si中Sc含量从0。3%增加至1%时，抗拉强度和屈服强度均上升，但由于AlSi2Sc2相的存在，其伸长率下降;当Sc含量为1%、Si含量从6%降至3%时，抗拉强度、屈服强度和伸长率分别上升2%、12%和21%，主要是凝固过程中析出了Al3Sc而非AlSi2Sc2相。最后，还讨论了Si-Sc交互作用对组织演变的机制。
Effection of the Interaction Between Si and Sc on the Microstructure and Properties of As Casted Al-Si-Sc Alloys
Scandium(Sc)and silicon(Si)are effective for modifying Al based alloys,while their combined effect may be limited by some Si-Sc interaction,which still need to be further studied.In this paper,Al alloys with varying Si and Sc additions were prepared for microstructure characterization and tensile testing.The results showed that Sc refines the α-Al grain via a heterogeneous nucleation induced by in-situ formed primary Al3Sc.A network AlSi2Sc2 phase was formed via a eutectic reaction and a bulk AlSi2Sc2 was generated from a peritectic reaction.Both AlSi2Sc2 competitively consumed the Sc solute in the same alloy,weakening the refining effectiveness of Al3Sc.The Sc also refined the eutectic Si to more ordered fiber/plate-like structure,and a proper ratio of Si to Sc could avoid the AlSi2Sc2 formation.When increasing Sc from 0.3 to 1.0 wt%in Al alloys containing 6%Si,the ultimate tensile strength(UTS)and yield strength(YS)increased,but the EL decreased due to the presence of AlSi2Sc2 phase.When the Sc content was 1%and the Si content reduced from 6%to 3%,the tensile strength,yield strength and elongation increase by 2%,12%and 21%,with Al3Sc in a dominant role in solidification reactions without AlSi2Sc2 formation.The mechanisms of microstructure modification with Si-Sc interaction were also discussed.

Al-Si-Sc alloymicrostructure characterizationheterogeneous nucleationmodification

周荣虎、周鹏飞

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盐城工业职业技术学院 汽车与交通学院,江苏盐城 224005

Al-Si-Sc合金 组织 异质形核 变质

国家外国专家项目(2022)江苏省高等学校基础科学自然科学研究面上项目(2022)江苏省产学研合作项目(2022)江苏省产学研合作项目(2022)校级高级人才科研项目(2023)校级博士基金(2023)

G2022014146L22KJD430011BY202210112023hx-63ygy6070014007ygy2201

2024

铸造
沈阳铸造研究所 中国机械工程学会铸造分会

铸造

CSTPCD
影响因子：0.499
ISSN：1001-4977
年,卷(期)：2024.73(5)
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