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Contributions to yield strength in an ultrafine grained 1050 aluminum alloy after DC current annealing

机译：直流电流退火后超细晶粒1050铝合金对屈服强度的贡献

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摘要

The ultrafine grained (UFC) 1050 aluminum alloy was prepared by equal channel angular pressing at cryogenic temperature (cryoECAP). The evolution of the yield strength and microstructures of UFG 1050 aluminum alloy after direct electric current (DC current) annealing at 150-400 ℃ for 1 h were investigated by tensile test, electron back scattering diffraction pattern (EBSD) and transmission electron microscopy (TEM). For the cryoECAPed and annealed samples at 150-250 ℃, the predominant boundaries are high angle boundaries (HABs) (＞ 60%), many dislocations accumulate at subgrain and/or grain boundaries, the yield strength (126-159 MPa) mainly comes from the dislocation and grain boundary strengthening contributions. While an unusual increase in the yield strength (by 8.1-11.2%) observed in samples annealed at 150-200 ℃ is attributed to an additional strengthening contribution from the more HABs having stable structures which can act as effective barriers to dislocation motion during tensile deformation. When annealing at 300-400 ℃, the microstructures are free of dislocations, the yield strength (29-45 MPa) comes from the grain boundary strengthening contribution. With the application of DC current, the larger grain size, lower dislocation density and higher fraction of LABs having mis-orientation angle between 3-7° in samples annealed at 150-250 ℃ result in the lower yield strength, while the smaller average grain sizes in samples annealed at 300-400 ℃ cause the higher yield strength.
机译：通过在低温下等通道角压制（cryoECAP），制备了超细晶粒（UFC）1050铝合金。通过拉伸试验，电子背散射衍射图（EBSD）和透射电子显微镜（TEM）研究了UFG 1050铝合金在150-400℃直流电（直流）退火1 h后的屈服强度和组织的演变。 ）。对于在150-250℃下冷冻和退火的样品，主要边界是高角度边界（HABs）（＞ 60％），许多位错积累在亚晶粒和/或晶粒边界，屈服强度（126-159 MPa）主要来自从位错和晶界强化的贡献。在150-200℃退火的样品中观察到的屈服强度异常增加（增加8.1-11.2％）是由于更多具有稳定结构的HAB产生了额外的增强作用，这些HAB在拉伸变形过程中可作为位错运动的有效屏障。在300-400℃退火时，组织没有位错，屈服强度（29-45 MPa）来自晶界强化。在施加直流电流的情况下，在150-250℃退火的样品中，较大的晶粒尺寸，较低的位错密度和较高的LAB取向角在3-7°之间的LAB导致较低的屈服强度，而平均晶粒较小在300-400℃退火的样品尺寸较大会导致较高的屈服强度。

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  • 来源
    《Materials Science and Engineering》 |2016年第30期|193-202|共10页
  • 作者

    Yiheng Cao; Lizi He; Yizhou Zhou; Ping Wang; Jianzhong Cui;

  • 作者单位

    Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China;

    Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China,School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China;

    Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;

    Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China,School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China;

    Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China,School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China;

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  • 正文语种 eng
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  • 关键词

    Direct electric current annealing; Ultrafine grained 1050 aluminum alloy; Yield strength; Dislocations; High angle boundaries;

    机译：直接电流退火;1050超细晶粒铝合金;屈服强度;脱位;高角度边界;

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