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首页> 外文期刊>Journal of Materials Research >Effect of ceramic particle size on densification behavior, microstructure formation, and performance of TiB_2-reinforced AI-based composites prepared by selective laser melting
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Effect of ceramic particle size on densification behavior, microstructure formation, and performance of TiB_2-reinforced AI-based composites prepared by selective laser melting

机译：陶瓷粒径对选择性激光熔融制备的TiB_2增强AI基复合材料致密化行为，微观结构形成和性能的影响

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摘要

AI-based composites with micrometer and submicro-TiB_2 reinforcements (1 wt%) have been produced by selective laser melting (SLM) from mixed powder under different processing conditions. The results show that the densifkation level of SLM-processed composite with submicro-TiB., particles (>99.0%) was 0.3-2.4% larger than that of micrometer TiB_2-reinforced composite under the same processing conditions. The distribution of Si precipitates in the matrix experienced a transform from continuous cellular to directional line-like morphology with reinforcement size decreasing from micron to submicron. The reinforcement size added in the matrix also exhibited a critical influence on preferred orientation and grain size of matrix. The SLM-processed composites exhibited improved tensile strength and ductility with a decrease of reinforcement size. High tensile strength of ～400 MPa and elongation of ～3.6% were obtained for the fine TiB_2-reinforced samples, increasing by 6 and 13% compared with that of micro-TiB_2-added samples, respectively.
机译：具有微米级和亚微米TiB_2增强材料（1 wt％）的AI基复合材料是通过在不同加工条件下从混合粉末中进行选择性激光熔融（SLM）制成的。结果表明，在相同工艺条件下，SLM处理的亚微米TiB颗粒（> 99.0％）的致密化程度比微米TiB_2增强的复合物的致密化程度高0.3-2.4％。 Si沉淀物在基体中的分布经历了从连续的蜂窝状到有方向的线状形态的转变，其增强尺寸从微米减小到了亚微米。添加到基体中的增强材料尺寸也对基体的优选取向和晶粒尺寸显示出关键影响。经SLM处理的复合材料显示出改善的拉伸强度和延展性，同时减小了增强材料的尺寸。细TiB_2增强的样品获得了约400 MPa的高抗拉强度和约3.6％的伸长率，与添加微TiB_2的样品相比分别增加了6％和13％。

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  • 来源
    《Journal of Materials Research》 |2020年第6期|559-570|共12页
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    College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing 210016 China and Jiangsu Provincial Engineering Laboratory for Laser Additive Manufacturing of High-Performance Metallic Components Nanjing University of Aeronautics and Astronautics Nanjing 210016 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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