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In-situ hybrid Cr_3C_2 and γ'-Ni_3(Al, Cr) strengthened Ni matrix composites: Microstructure and enhanced properties

机译：原位杂交CR_3C_2和γ-NI_3（A1，CR）强化Ni矩阵复合材料：微观结构和增强性能

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摘要

Mechanical properties of Ni-based superalloys strongly depend on γ'-Ni_3Al precipitates and hard particles. However, the traditional Ni-based composites have reached the serviceability limit as to satisfy the requirement of higher speed and thrust to weight ratio for advanced aerospace engines. Herein, we successfully fabricated a novel in-situ Cr_3C_2 particulate combined with γ'-Ni_3(Al, Cr) precipitate synergistically reinforced pure Ni matrix composites by reactive hot press techniques. The SEM and XRD results demonstrate that ternary layered Cr_2AlC decompose and transform into nonstoichiometric Cr_3C_2 particles at high temperature, while the additional Al and fractional Cr atoms reacted with Ni matrix to form γ'-Ni_3(Al, Cr). Microstructure and mechanical behavior of the as-resulted composite materials in relationship with different fractions of Cr_2AlC (10 vol%, 20 vol%, 30 vol% and 40 vol%) are carefully investigated. In 30 vol%Cr_2AlC/Ni and 40 vol%Cr_2AlC/Ni composites, the in-situ synthesized Cr_3C_2 particles and γ' phase are uniformly distributed in the matrix, consequently endowing the composites superior mechanical properties. The flexural strength of 30 vol% and 40 vol% Cr_2AlC/Ni composites was 1790 ± 25 MPa and 1752 ± 73 MPa respectively, which is about 7 times higher than the pure Ni matrix. In addition, the tensile strength was determined to be 947 ± 19 MPa and 846 ± 15.9 MPa, respectively. For the substantial reinforcement, the dominant contributions are ascribed to the combined strengthening mechanisms in term of refining the grain, precipitate strengthening and solid-solution strengthening.
机译：基于Ni的高温合金的机械性能强烈地取决于γ'-Ni_3Al沉淀物和硬颗粒。然而，传统的基于Ni的复合材料达到了可靠性限制，以满足高速和推力对先进航空航天发动机的重量比的要求。这里，我们成功地制造了一种新的原位CR_3C_2颗粒，与γ'-Ni_3（Al，Cr）通过反应热压技术沉淀协同增强的纯Ni基质复合材料。 SEM和XRD结果表明，三元分层CR_2ALC在高温下分解并转化为不静脉CR_3C_2颗粒，而另外的Al和分数Cr原子与Ni基质反应以形成γ'-Ni_3（Al，Cr）。基于CR_2ALC的不同级分（10体积％，20体积％，30体积％和40体积％）的基因和机械性能的组织和力学行为。在30体积％CR_2ALC / Ni和40Vol％CR_2ALC / Ni复合材料中，原位合成的CR_3C_2颗粒和γ'相均匀地分布在基质中，因此赋予复合材料优异的机械性能。 30体积％和40体积％CR_2ALC / Ni复合材料的抗弯强度分别为1790±25MPa和1752±73MPa，比纯Ni基质高约7倍。另外，测定拉伸强度分别为947±19MPa和846±15.9MPa。对于大量加固，主导贡献在精制谷物中归因于精制晶粒，沉淀强化和固溶强化。

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  • 来源
    《Materials Science and Engineering》 |2021年第13期|141524.1-141524.9|共9页
  • 作者

    Yidan Jiao; Zhenying Huang; Wenqiang Hu; Xue Li; Qun Yu; Yuanbo Wang; Yang Zhou; Davoud Dastan;

  • 作者单位

    Center of Materials Science and Engineering School of Mechanical and Electronic Control Engineering Beijing Jiaotong University Beijing 100044 China;

    Center of Materials Science and Engineering School of Mechanical and Electronic Control Engineering Beijing Jiaotong University Beijing 100044 China;

    Center of Materials Science and Engineering School of Mechanical and Electronic Control Engineering Beijing Jiaotong University Beijing 100044 China;

    Center of Materials Science and Engineering School of Mechanical and Electronic Control Engineering Beijing Jiaotong University Beijing 100044 China;

    Center of Materials Science and Engineering School of Mechanical and Electronic Control Engineering Beijing Jiaotong University Beijing 100044 China;

    Center of Materials Science and Engineering School of Mechanical and Electronic Control Engineering Beijing Jiaotong University Beijing 100044 China;

    Center of Materials Science and Engineering School of Mechanical and Electronic Control Engineering Beijing Jiaotong University Beijing 100044 China;

    School of Materials Science and Engineering Georgia Institute of Technology Atlanta GA 30332 USA;

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  • 正文语种 eng
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  • 关键词

    Ni-based; Composites; Cr_3C_2; γ'-Ni_3(Al,Cr); Microstructure; Mechanical behavior;

    机译：基于NI的;复合材料;CR_3C_2;γ'-ni_3（Al;Cr）;微观结构;机械行为;

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