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Mechanical properties and microstructure of ultrafine grained commercial purity aluminium prepared by cryo-hydrostatic extrusion

机译：冷冻-静水挤压法制备的超细颗粒商业纯铝的力学性能和微观结构

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摘要

CP 99.5% aluminium was processed by cryo-hydrostatic extrusion with true strains up to 3.4 in one pass. The aim was to refine its microstructure and improve its mechanical properties. The properties of the thus processed material were compared with those obtained after the same process but run at room temperature. Cooling the billet with liquid nitrogen combined with water cooling of the extruded wire enabled suppressing partially the dynamic and static structural processes. The grain size was reduced to -400 nm in the cryo-extrusion, and to -450 nm in the room-extrusion. In the cryo-extrusion the increase of the yield strength to 168 MPa and the hardness to 56HV0.2 with the respective reduction of the elongation to fracture to 13.6% were obtained. The cryo-cooling effectiveness and the influence of the adiabatic heat generated during the plastic processing on the structure, mechanical properties, hardness, and tensile impact toughness just after hydrostatic extrusion, an also after the post deformation annealing are discussed. In view of the intensive adiabatic heating amounting to 0.57T_m no special improvement of the mechanical properties after the post-deformation annealing was observed. The cryo-cooling became effective at the true strain ε > 2, where the extrusion pressures clearly differed from the room-extrusion pressures and the defect density substantially increased. After the cryo-hydrostatic extrusion the mechanical properties were comparable to the highest values reported in the literature for cryo-rolling but, since they were obtained in a single deformation step and with twice as large subgrains, the ductility of the extruded aluminium was higher. During the cryo-hydrostatic extrusion conducted at high strains the reduction in ductility of the aluminium is hindered and thanks to the beneficial role of the hydrostatic stress active in the material the structural and mechanical effects which occur during severe plastic deformation are enhanced.
机译：CP 99.5％的铝通过低温流体静力挤压加工，一次通过的真实应变高达3.4。目的是改善其微观结构并改善其机械性能。将如此处理的材料的性质与在相同的过程但在室温下运行后获得的性质进行比较。用液氮冷却坯料并结合挤压线材的水冷，可以部分抑制动态和静态结构过程。在低温挤出中，晶粒尺寸减小至-400nm，而在室温挤出中，晶粒尺寸减小至-450nm。在低温挤出中，获得了将屈服强度提高至168MPa，将硬度提高至56HV0.2以及将断裂伸长率分别降低至13.6％的效果。讨论了塑性加工过程中产生的低温冷却效果以及绝热对结构，力学性能，硬度和静液压挤压后的拉伸冲击韧性的影响，以及变形后退火后的影响。考虑到高达0.57T_m的绝热加热，在变形后退火之后未观察到机械性能的特殊改善。低温冷却在真实应变ε> 2时生效，在该应变下，挤出压力明显不同于室内挤出压力，并且缺陷密度显着增加。在低温静液压挤压之后，其机械性能与文献中报道的用于冷轧的最高值相当，但是由于它们是在单个变形步骤中获得的，并且具有两倍大的亚晶粒，因此挤压铝的延展性更高。在以高应变进行的低温静液压挤压过程中，铝的延展性降低受到阻碍，并且由于静液压应力作用在材料中的有益作用，在严重的塑性变形过程中发生的结构和机械效应得到增强。

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  • 来源
    《Materials Science and Engineering》 |2017年第may17期|178-192|共15页
  • 作者

    Wacek Pachla; Mariusz Kulczyk; Julita Smalc-Koziorowska; Monika Wróblewska; Jacek Skiba; Sylwia Przybysz; Mariusz Przybysz;

  • 作者单位

    Institute of High Pressure Physics, Polish Academy of Sciences (Unipress), uL Sakohwska 29, 01-142 Warszawa, Poland;

    Institute of High Pressure Physics, Polish Academy of Sciences (Unipress), uL Sakohwska 29, 01-142 Warszawa, Poland;

    Institute of High Pressure Physics, Polish Academy of Sciences (Unipress), uL Sakohwska 29, 01-142 Warszawa, Poland;

    Institute of High Pressure Physics, Polish Academy of Sciences (Unipress), uL Sakohwska 29, 01-142 Warszawa, Poland;

    Institute of High Pressure Physics, Polish Academy of Sciences (Unipress), uL Sakohwska 29, 01-142 Warszawa, Poland;

    Institute of High Pressure Physics, Polish Academy of Sciences (Unipress), uL Sakohwska 29, 01-142 Warszawa, Poland;

    Institute of High Pressure Physics, Polish Academy of Sciences (Unipress), uL Sakohwska 29, 01-142 Warszawa, Poland;

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  • 正文语种 eng
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  • 关键词

    Hydrostatic extrusion; Cryo-deformation; Grain refinement; Mechanical properties; Ductility;

    机译：静液压挤出;低温变形;晶粒细化;机械性能延展性;

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