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首页> 外文期刊>Materials Science and Engineering >Nano-indentation behavior of layered ultra-fine grained AA8006 aluminum alloy and AA8006-B_4C nanostructured nanocomposite produced by accumulative fold forging process
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Nano-indentation behavior of layered ultra-fine grained AA8006 aluminum alloy and AA8006-B_4C nanostructured nanocomposite produced by accumulative fold forging process

机译：累积折叠锻造法制备层状超细晶粒AA8006铝合金和AA8006-B_4C纳米结构纳米复合材料的纳米压痕行为

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摘要

In this article, a new severe plastic deformation (SPD) process called accumulative fold-forging (AFF) was implemented to produce layered ultra-fine grained (UFG) AA8006 aluminum alloy and AA8006-B4C (35 nm, 10 vol %) nanostructured (NS) nanocomposite materials. The basis of this novel SPD process involves repetitive folding and forging steps with or without the incorporation of large fractions of nanoparticles between aluminum foil layers; this results in a uniform dispersion of the nanoparticles with less clustering/aggregation, low fraction of porosity, and strong bonding between the layers. Cyclic fold-forging process leads to refining the grain structure of aluminum matrix down to UFG range of similar to 200 nm and nano-sized range of similar to 35 nm with and without the B4C nanoparticles. In the present paper, mechanical property and strengthening mechanisms of the produced materials and the contributions of precipitates, nano-layers, nano-grains, and nanoparticles were assessed using a localized nano-indentation testing technique at ambient temperature along different directions, By introducing nano-sized B4C particles between the nano-layers, the modulus and hardness improved up to two times with the average values of similar to 67.4 and 2.15 GPa, respectively compared to the AFF processed alloy.
机译：在本文中，实施了一种称为累积褶皱锻造（AFF）的新的严重塑性变形（SPD）工艺，以生产层状超细晶粒（UFG）AA8006铝合金和AA8006-B4C（35 nm，10体积％）纳米结构化（ NS）纳米复合材料。这种新颖的SPD工艺的基础涉及重复折叠和锻造步骤，在铝箔层之间添加或不添加大比例的纳米颗粒。这导致纳米颗粒的均匀分散，具有较少的聚集/聚集，低孔隙率和层之间的牢固结合。循环折叠锻造工艺可将铝基体的晶粒结构细化至有和没有B4C纳米粒子的UFG范围类似于200 nm，纳米尺寸范围类似于35 nm。在本文中，采用局部纳米压痕测试技术，在室温下沿不同方向，通过引入纳米技术，评估了所生产材料的机械性能和强化机理以及沉淀物，纳米层，纳米颗粒和纳米颗粒的贡献。与AFF处理的合金相比，纳米层之间的B4C尺寸大的颗粒，其模量和硬度提高了两倍，平均值分别接近67.4和2.15 GPa。

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