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Property enhancement of CoCrNi medium-entropy alloy by introducing nano-scale features

机译：COCRNI中熵合金的性能提高纳米尺度特征

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摘要

CoCrNi -medium-entropy alloy (MEA) has been widely investigated due to its superior mechanical properties that overcome strength-ductility tradeoff. Here we show further property enhancement of CoCrNi MEA by introducing nano-scale features. Both CoCrNi and oxide dispersion strengthened (ODS) CoCrNi are fabricated by mechanical alloying and spark plasma sintering. Microstructural characterization and mechanical testing of these nanostructured MEAs revealed that the nano-scale features significantly improves the strength of the alloys. In ODS-CoCrNi MEA, Y_2Ti_2O_7 oxides with an average diameter of 7.3 ± 3.2 nm are incoherent with the matrix, and a specific orientation relationship exists between Y_2Ti_2O_7 and the matrix, which is [011]_(Y2Ti2O7)//[011]_(Matrix), (400)_(Y2Ti2O7)//(200)_(Matrix) and (222)_(Y2Ti2O7)//(111)_(Matrix). The recrystallization and grain growth processes are effectively suppressed by the introduction of Y_2Ti_2O_7 nanoparticles. Strengthening mechanism analyses indicate that the strength improvement of ODS-CoCrNi is mainly ascribed to the precipitation strengthening of Y_2Ti_2O_7.
机译：COCRNI -MEDIUM-熵合金（MEA）由于其优越的机械性能而克服了强度 - 延迟权衡。在这里，我们通过引入纳米尺度特征来展示COCRNI MEA的进一步的财产增强。 COCRNI和氧化物分散体强化（ODS）COCRNI通过机械合金化和火花等离子体烧结制造。这些纳米结构测量的微观结构表征和机械测试显示纳米尺度特征显着提高了合金的强度。在ODS-CoCroMIEA中，平均直径为7.3±3.2nm的Y_2TI_2O_7氧化物与矩阵不相连，并且在Y_2TI_2O_7和矩阵之间存在特定的取向关系，这是[011] _（Y2TI2O7）// [011] _ （矩阵），（400）_（y2ti2o7）//（200）_（矩阵）和（222）_（y2ti2o7）//（111）_（矩阵）。通过引入Y_2TI_2O_7纳米颗粒有效地抑制重结晶和晶粒生长过程。强化机制分析表明，ODS-COCRNI的强度改善主要归因于Y_2TI_2O_7的沉淀强化。

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  • 来源
    《Materials Science and Engineering》 |2021年第10期|141368.1-141368.11|共11页
  • 作者

    Mingyang Li; Yuanhang Guo; Wuming Li; Yanwen Zhang; Yongqin Chang;

  • 作者单位

    School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China;

    School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China;

    School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China;

    Materials Science and Technology Division Oak Ridge National Laboratory Oak Ridge TN 37831 USA Department of Materials Science and Engineering University of Tennessee Knoxville 37996 USA;

    School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Medium-entropy alloy; ODS; Carbide; Orientation relationship; Dislocation locks;

    机译：中等熵合金;ods;碳化物;方向关系;错位锁;

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