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首页> 外文期刊>Materials Science and Engineering >An examination of microstructural evolution in a Pb-Sn eutectic alloy processed by high-pressure torsion and subsequent self-annealing
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An examination of microstructural evolution in a Pb-Sn eutectic alloy processed by high-pressure torsion and subsequent self-annealing

机译：高压扭转和随后自退火处理PB-SN共晶合金的微观结构演化检查

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摘要

The Pb-Sn alloy has a wide use in the electronic, energy storage and nuclear industries and a fine-grained Pb-Sn alloy may open up new possibilities for applications in these industries. In order to understand the behavior of grain refinement, a Pb-62% Sn eutectic alloy was processed by high-pressure torsion (HPT), stored at room temperature (RT) and then the microstructures of the alloy after HPT were repeatedly investigated during the course of self-annealing using electron backscatter diffraction, scanning electron microscopy and transmission electron microscopy. It is demonstrated that there is a large fraction of twin boundaries with a twin relationship of 62.8°<100> in the microstructure of the initial as-cast condition. Due to the presence of the high imposed pressure, the mobility of 121 boundaries at 71° is greatly favoured during processing by HPT. After the high pressure is removed, the mobility of dislocation-twin boundaries near 62.8°<100> is then favoured. Processing by HPT significantly increases the solubility of Sn in the Pb phase. The supersaturated state of Sn in Pb is not stable during self-annealing at RT and instead a decomposition of Sn from the Pb-rich phase is observed after storage for 16 days. The main mechanism for this decomposition is lattice diffusion.
机译：PB-SN合金在电子，储能和核工业中广泛使用，细粒度的PB-SN合金可以为这些行业的应用开辟新的可能性。为了了解晶粒细化的行为，通过高压扭转（HPT）加工PB-62％SN共晶合金，在室温（RT）（RT），然后在HPT后重复研究合金的微观结构使用电子反向散射衍射，扫描电子显微镜和透射电子显微镜进行自退火过程。结果证明，在初始的铸造条件的微观结构中具有大部分双界面具有62.8°<100>的双重关系。由于存在高施加的压力，在71°处的121个边界的迁移率在通过HPT处理期间极大地青睐。在除去高压后，然后优选脱位 - 双界近62.8°<100℃的迁移率。 HPT处理显着增加了SN在Pb相中的溶解度。在室温下，Pb中的Sn的过饱和状态在自退火过程中不稳定，而是在储存16天后观察到富含Pb的相位的Sn的分解。这种分解的主要机制是晶格扩散。

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  • 来源
    《Materials Science and Engineering》 |2021年第20期|140653.1-140653.12|共12页
  • 作者

    Nian Xian Zhang; Megumi Kawasaki; Yi Huang; Terence G. Langdon;

  • 作者单位

    Materials Research Group Department of Mechanical Engineering University of Southampton Southampton SO17 1BJ UK Materials Department Crown Technology Downsview Road Wantage 0X12 9BP UK;

    School of Mechanical Industrial and Manufacturing Engineering Oregon State University Corvallis OR 97331 USA;

    Materials Research Group Department of Mechanical Engineering University of Southampton Southampton SO17 1BJ UK Department of Design and Engineering Faculty of Science and Technology Bournemouth University Poole Dorset BH12 5BB UK;

    Materials Research Group Department of Mechanical Engineering University of Southampton Southampton SO17 1BJ UK Departments of Aerospace Mechanical Engineering and Materials Science University of Southern California Los Angeles CA 90089-1453 USA;

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  • 正文语种 eng
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  • 关键词

    High-pressure torsion; Pb-Sn alloy; Self-annealing; Solubility; Twin boundaries;

    机译：高压扭转;PB-SN合金;自退火;溶解度;双界限;

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