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首页> 外文会议>International Conference on Material Science and Engineering >Superplastic Elongation through Deformation Mechanism Transition during High-Temperature Deformation in Thermally Unstable Fine-Grained Aluminum Solid Solution Alloy
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Superplastic Elongation through Deformation Mechanism Transition during High-Temperature Deformation in Thermally Unstable Fine-Grained Aluminum Solid Solution Alloy

机译：通过在热不稳定细粒铝固体溶液合金中高温变形期间通过变形机理转变的超塑性伸长

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摘要

In this study, the superplastic behavior on a fine-grained aluminum solid solution alloy consisting of thermally unstable microstructures was investigated. In order to obtain the fine-grained microstructure, friction stir processing (FSP) was applied to a commercial 5083 aluminum alloy. An equiaxial fine-grained microstructure of 7.8μm was obtained after FSP, but this microstructure was thermally unstable at high temperatures. Commonly, for fine-grained superplasticity to occur (or to continue grain boundary sliding (GBS)), it is necessary to keep the fine-grained microstructure to less than 10μm during the high-temperature deformation. However, in this study, a large elongation of over 200% was observed at high temperatures in spite of the occurrence of grain growth. From the microstructural observations, it was determined that the fine-grained microstructure was maintained until the early stage of deformation, but the transgranular deformation was observed at a strain of over 100%. The microstructural feature of the abovementioned transgranular deformation is similar to the deformation microstructure of the solute drag creep occurring in "Class I"-type solid solution alloys. This indicates that the deformation mechanism transition from GBS to the solute drag creep occurred during high-temperature deformation. Here, the possibility of occurrence of the superplastic elongation through deformation mechanism transition is discussed as a model of the thermally unstable aluminum solid solution alloy.
机译：在这项研究中，研究了由热不稳定微结构组成的细粒铝固溶溶液合金上的超塑性行为。为了获得细粒微观结构，将摩擦搅拌处理（FSP）应用于商业5083铝合金。在FSP之后获得均匀细粒细粒细胞结构为7.8μm，但在高温下这种微观结构在热不稳定。通常，对于发生细粒度的超塑性（或继续晶界滑动（GBS）），在高温变形期间必须将细粒微粒微观结构保持在小于10μm。然而，在本研究中，尽管发生了晶粒生长，但在高温下观察到大约200％的大伸长率。从微观结构观察中，确定保持细粒微观结构直至变形的早期阶段，但在100％以上的菌株中观察到响变变形。上述响变型变形的微观结构特征类似于“I”型固体溶液合金中发生的溶质抗蠕变的变形微观结构。这表明在高温变形期间发生从GBS到溶质阻力蠕变的变形机制过渡。这里，通过变形机构转变发生超塑性伸长的可能性作为热不稳定铝固体溶液合金的模型。

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