氧化物含量和烧结温度对放电等离子烧结制备晶内氧化物强化铁合金组织和力学性能的影响

张德印; 郝旭; 贾宝瑞; 吴昊阳; 章林; 秦明礼; 曲选辉

doi:10.1007/s12613-023-2631-8

Volume 30 Issue 9

Sep. 2023

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文章导航 > 矿物冶金与材料学报（英文） > 2023 > 30(9): 1748-1755

Deyin Zhang, Xu Hao, Baorui Jia, Haoyang Wu, Lin Zhang, Mingli Qin, and Xuanhui Qu, Influences of oxide content and sintering temperature on microstructures and mechanical properties of intragranular-oxide strengthened iron alloys prepared by spark plasma sintering, Int. J. Miner. Metall. Mater., 30(2023), No. 9, pp. 1748-1755. https://doi.org/10.1007/s12613-023-2631-8

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Deyin Zhang, Xu Hao, Baorui Jia, Haoyang Wu, Lin Zhang, Mingli Qin, and Xuanhui Qu, Influences of oxide content and sintering temperature on microstructures and mechanical properties of intragranular-oxide strengthened iron alloys prepared by spark plasma sintering, Int. J. Miner. Metall. Mater., 30(2023), No. 9, pp. 1748-1755. https://doi.org/10.1007/s12613-023-2631-8

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研究论文

氧化物含量和烧结温度对放电等离子烧结制备晶内氧化物强化铁合金组织和力学性能的影响

1)
北京科技大学新材料技术研究院, 北京 100083, 中国
2)
北京科技大学顺德创新学院, 佛山 528399, 中国

通讯作者:
张德印 E-mail: zhangdeyin@ustb.edu.cn

秦明礼 E-mail: qinml@mater.ustb.edu.cn

文章亮点

(1) 基于溶液燃烧路线和放电等离子烧结制备了具有高强度和优异韧性的晶内氧化钇弥散强化铁合金。

(2) 系统地研究了氧化物含量和烧结温度对氧化钇弥散强化铁合金微观组织和性能的影响规律。

(3) 揭示了晶内氧化钇弥散强化铁合金的形成机理和强化机制。

中文摘要

越来越多的工程设计用结构材料需要有高的强度、刚度和断裂韧性。如何在不牺牲韧性的情况下提高材料强度一直是材料研究者制造高性能合金时孜孜以求的目标。本文基于溶液燃烧路线和放电等离子烧结制备了具有高强度和优异韧性的氧化钇纳米粒子均匀分散于铁基体晶粒内部的弥散强化铁合金，系统地研究了氧化钇含量和烧结温度对合金微观组织和性能的影响规律。研究结果表明，当氧化钇含量一定时，随着烧结温度的提升，合金的相对密度和晶粒尺寸增大，显微硬度和压缩强度降低，应变失效率增大。当烧结温度一定时，随着氧化钇含量的增加，氧化钇对合金致密化的作用阻碍增大，烧结合金的相对密度减小，显微硬度和压缩强度增大。可通过合理选择氧化钇添加量和烧结温度来获得的满足使用要求的合金。在650°C烧结温度下制备的Fe–2wt%Y₂O₃ 合金的平均晶粒尺寸为147.5 nm，其晶内氧化钇粒子的平均晶粒尺寸为15.5 nm。通过压缩测试该合金极限抗压强度高达1.86 GPa，应变破坏率高达29%，表现出高的强度和良好的韧性，这主要归因于该合金的微观结构。本文也详细分析和揭示了该合金的微观结构形成机理和强化机制，其中细晶强化和弥散强化是提升合金性能的主要强化机制，为制备高性能弥散强化合金提供理论和技术基础。

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Research Article

Influences of oxide content and sintering temperature on microstructures and mechanical properties of intragranular-oxide strengthened iron alloys prepared by spark plasma sintering

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Abstract

Abstract

How to increase strength without sacrificing ductility has been developed as a key goal in the manufacture of high-performance metals or alloys. Herein, the double-nanophase intragranular yttrium oxide dispersion strengthened iron alloy with high strength and appreciable ductility was fabricated by solution combustion route and subsequent spark plasma sintering, and the influences of yttrium oxide content and sintering temperature on microstructures and mechanical properties were investigated. The results show at the same sintering temperature, with the increase of yttrium oxide content, the relative density of the sintered alloy decreases and the strength increases. For Fe–2wt%Y₂O₃ alloy, as the sintering temperature increases gradually, the compressive strength decreases, while the strain-to-failure increases. The Fe–2wt%Y₂O₃ alloy with 15.5 nm Y₂O₃ particles uniformly distributed into the 147.5 nm iron grain interior sintered at 650°C presents a high ultimate compressive strength of 1.86 GPa and large strain-to-failure of 29%. The grain boundary strengthening and intragranular second-phase particle dispersion strengthening are the main dominant mechanisms to enhance the mechanical properties of the alloy.
- oxide dispersion strengthening;
- spark plasma sintering;
- microstructure and properties;
- strengthening mechanism

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