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Annealing behavior of gradient structured copper and its effect on mechanical properties

机译:梯度结构铜的退火行为及其对力学性能的影响

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摘要

In this study, hot-extruded copper rods were subjected to free-end-torsion and subsequent annealing. The mi-crostructures and mechanical properties of the deformed samples and annealed samples were investigated. The results show that torsion can introduce gradient lamellar dislocation substructures (IDS) into the copper rods, suggesting a gradient distribution of stored energy from core to surface. Different degrees of recrystallization were formed in the same torsional rod after recrystallization annealing due to such gradient stored energy. Annealing can change the microstructure inversely from deformed gradient into annealed gradient distribution via fully recrystallization in the surface layer and incomplete recrystallization in the middle layer. Therefore, gradient structured copper rods with soft core and hard shell or hard core and soft shell could be obtained by torsion or the combination of torsion and subsequent annealing, respectively. The tensile yield strength of such gradient structured rods has a linear relationship with the volume fraction of hard and soft regions no matter where the hard region is located, core or surface. The incomplete recrystallization mechanisms of gradient structured copper rods induced by torsion were also discussed.%Copper; Torsion; Gradient microstructure; Annealing
机译:在这项研究中,对热挤压铜棒进行自由端扭转和随后的退火处理。研究了变形样品和退火样品的微观组织和力学性能。结果表明,扭转可将梯度层错位子结构(IDS)引入铜棒中,表明储能从铁心到表面的梯度分布。由于这种梯度存储的能量,在再结晶退火之后,在相同的扭杆中形成不同程度的再结晶。退火可以通过表面层的完全重结晶和中间层的不完全重结晶将微观结构从变形的梯度转变为退火的梯度分布。因此,可以分别通过扭转或扭转和随后的退火的组合获得具有软芯和硬壳或硬芯和软壳的梯度结构铜棒。这样的梯度结构杆的拉伸屈服强度与硬和软区域的体积分数具有线性关系,无论硬区域位于何处,芯部或表面。还讨论了梯度结构铜棒在扭转作用下的不完全再结晶机理。扭转梯度微观结构;退火

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  • 来源
    《Materials Science and Engineering》 |2017年第15期|331-342|共12页
  • 作者单位

    Faculty of Materials and Energy, Southwest University, Chongqing 400715, China,Department of Mechanical and Materials Engineering, Queen's University, 60 Union Street, Kingston, ON, Canada K7L3N6;

    School of Materials Science and Engineering, Chongqing University, Chongqing 400030, China;

    Department of Mechanical and Materials Engineering, Queen's University, 60 Union Street, Kingston, ON, Canada K7L3N6;

    School of Materials Science and Engineering, Chongqing University, Chongqing 400030, China;

    Faculty of Materials and Energy, Southwest University, Chongqing 400715, China;

    Faculty of Materials and Energy, Southwest University, Chongqing 400715, China;

    Faculty of Materials and Energy, Southwest University, Chongqing 400715, China;

    Faculty of Materials and Energy, Southwest University, Chongqing 400715, China;

    School of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Copper; Torsion; Gradient microstructure; Annealing;

    机译:铜;扭转梯度微观结构;退火;

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