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Effectively mitigated macro-segregation and improved tensile properties of twin-roll casting Al-Cu strips via the addition of TiC nanoparticles
Journal of Materials Processing Technology ( IF 6.3 ) Pub Date : 2021-05-01 , DOI: 10.1016/j.jmatprotec.2021.117200
Xiao Liu , Qinglong Zhao , Zhenwei Ji , Bao Wang , Yunlong Zhu , Qichuan Jiang

In this work, Al-5Cu and TiC/Al-5Cu strips were fabricated by vertical-type twin-roll casting (TRC), and the effects of TiC nanoparticles on the Al-Cu strips were investigated. The minor addition of TiC nanoparticles refined the grain structure, increased the Cu concentration in the α-Al dendrites and effectively mitigated the center macro-segregation of the as-cast strip, which could be due to the heterogeneous nucleation effect and the solute diffusion control of the TiC nanoparticles. The yield strength, ultimate tensile strength, and uniform elongation of the as-cast, as well as T6 treated Al-5Cu strip with the addition of TiC nanoparticles were simultaneously improved owing to fewer residual Cu-rich phases, refined θ′ precipitates, and finer grain structure. This work provided a strategy for the effective control of macro-segregation and producing high-formability alloy strips by the TRC process.



中文翻译:

通过添加TiC纳米颗粒有效地缓解了双辊铸造Al-Cu带钢的宏观偏析并改善了其拉伸性能

在这项工作中,Al-5Cu和TiC / Al-5Cu条带通过垂直型双辊铸造(TRC)制成,并研究了TiC纳米粒子对Al-Cu条带的影响。少量添加TiC纳米颗粒可细化晶粒结构,增加α-Al树枝状晶体中的Cu浓度,并有效缓解铸态带材的中心宏观偏析,这可能是由于异相成核作用和溶质扩散控制TiC纳米颗粒的数量。铸态以及添加了TiC纳米颗粒的铸态T5处理过的Al-5Cu带材的屈服强度,极限抗拉强度和均匀伸长率由于残留的富Cu相少,精炼的θ'析出物和晶粒结构更细。

更新日期:2021-05-06
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