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首页> 外文期刊>Materials Science and Engineering >Annealing hardening and softening of an ultrafine grained Cu-4.5vol.% Al_2O_3 nanocomposite
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Annealing hardening and softening of an ultrafine grained Cu-4.5vol.% Al_2O_3 nanocomposite

机译：超细晶粒Cu-4.5vol。％Al_2O_3纳米复合材料的退火硬化与软化

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摘要

Samples from an ultrafine-grained Cu-4.5vol.%Al_2O_3 nanocomposite rod fabricated by powder compact extrusion were annealed at 400 and 700 ℃ for 15 min respectively, and their microstructure and mechanical properties were investigated. It shows that the dislocation density decreased and Al_2O_3 nanoparticles severely coarsened after 700 ℃ annealing, leading to simultaneous decrease of both strength and tensile ductility (annealing softening). On the other hand, annealing at 400 ℃ also caused a dislocation density decrease, but without Al_2O_3 nanoparticle coarsening, and this leads to an unexpected and significant increase of both strength and ductility (annealing hardening). It is believed that the interaction between the dislocations and Al_2O_3 nanoparticles within the as-extruded sample weakens the Orowan strengthening, while the dislocation density decrease caused by 400 ℃ annealing allows the enhancement of the Orowan strengthening effect with a benefit of simultaneous increase of both strength and tensile ductility.
机译：将粉末压制成型的超细晶粒Cu-4.5vol。％Al_2O_3纳米复合棒的样品分别在400和700℃下退火15分钟，并对其微观结构和力学性能进行了研究。结果表明，经700℃退火后，位错密度降低，Al_2O_3纳米粒子严重粗化，导致强度和拉伸塑性同时降低（退火软化）。另一方面，在400℃退火也引起位错密度降低，但Al_2O_3纳米颗粒没有粗大化，这导致强度和延展性（退火硬化）均出乎意料且显着增加。可以认为，位错与Al_2O_3纳米颗粒在挤压后的相互作用减弱了Orowan的增强，而400℃退火引起的位错密度的降低则增强了Orowan的增强效果，同时提高了强度和拉伸延展性。

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  • 来源
    《Materials Science and Engineering》 |2020年第19期|139126.1-139126.7|共7页
  • 作者

    Chenguang Li; Wei Zeng; Yuehuang Xie; Jun Wang; Jiamiao Liang; Roland E. Logé; Deliang Zhang;

  • 作者单位

    Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China Laboratory of Thermo Mechanical Metallurgy (LMTM) PX Group Chair Ecole Polytechnique Fédérale de Lausanne (EPFL) 2000 Neuchâtel Switzerland;

    Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China;

    Laboratory of Thermo Mechanical Metallurgy (LMTM) PX Group Chair Ecole Polytechnique Fédérale de Lausanne (EPFL) 2000 Neuchâtel Switzerland;

    Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110819 China;

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  • 正文语种 eng
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  • 关键词

    CU-Al_2O_3 composite; Annealing; Microstructure; Mechanical property; Dislocation;

    机译：CU-Al_2O_3复合材料;退火;微观结构机械性能错位;

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