Abstract
The constitutive relationships of Al-Mg-Si alloy deformed at various strain rates, temperatures and strains were studied. The microstructure evolution was quantitatively characterized and analyzed, including recrystallization fraction, grain sizes, local misorientation, geometrically necessary dislocation and stored strain energy during hot deformation and subsequent heat treatment. The results show that the dislocation density and energy storage are linear with lnZ during hot deformation and subsequent heat treatment, indicating continuous recrystallization occurring in both processes. With higher lnZ, the dislocation density declines more sharply during subsequent heat treatment. When lnZ is less than 28, dislocation density becomes more stable with less reduction during subsequent heat treatment after hot deformation. As these dislocations distribute along low angle grain boundaries, the subgrain has good stability during subsequent heat treatment. The main recrystallization mechanism during hot deformation is continuous dynamic recrystallization, accompanied by geometric dynamic recrystallization at higher lnZ.
摘要
研究了不同应变速率、 温度和应变下变形的Al-Mg-Si合金本构关系. 定量表征和分析了热变形和热处理过程中合金的等微观组织演变, 包括再结晶分数、 晶粒尺寸、 局部位错取向、 几何必要位错和储能之间的关系. 结果表明, 在热变形和后续热处理过程中, 位错密度和储能与lnZ呈线性关系, 说明两个过程中都发生了连续再结晶. 随着lnZ 的增加, 位错密度在随后的热处理过程中下降更为明显. 当lnZ 小于28时, 在热变形后的后续热处理过程中, 位错密度随变形量的减小而趋于稳定. 由于位错沿低角度晶界分布, 亚晶在后续热处理过程中具有良好的稳定性. 热变形过程中的主要再结晶机制是连续动态再结晶, 并伴随高lnZ下的几何动态再结晶.
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Project(2016YFB0300901) supported by the National Key R&D Program of China; Project(TC190H3ZV/2) supported by the National Building Project of Application Demonstration Platform on New Materials Products, China; Project (15308469779) supported by Key Laboratory of National Science and Technology for Equipment Pre-research, China
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LI Ze-cheng’s contributions are formal analysis, investigation, writing original draft, software and data curation. DENG Yun-lai’s contributions are conceptualization, funding acquisition and project administration. YUAN Man-fa’s contributions are formal analysis and supervision. ZHANG Jin’s contributions are project administration and resources. GUO Xiao-bin’s contributions are methodology, writing review, editing and validation.
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LI Ze-cheng, DENG Yun-lai, YUAN Man-fa, ZHANG Jin and GUO Xiao-bin declare that they have no conflict of interest.
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Li, Zc., Deng, Yl., Yuan, Mf. et al. Effect of isothermal compression and subsequent heat treatment on grain structures evolution of Al-Mg-Si alloy. J. Cent. South Univ. 28, 2670–2686 (2021). https://doi.org/10.1007/s11771-021-4801-z
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DOI: https://doi.org/10.1007/s11771-021-4801-z