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Preparation and mechanical properties of TiC_x-Ni_3(Al,Ti)/Ni composites synthesized from Ni alloy and Ti_3AlC_2 powders

机译:Ni合金和Ti_3AlC_2粉末合成的TiC_x-Ni_3(Al,Ti)/ Ni复合材料的制备及力学性能

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摘要

In this work, a novel TiC_x-Ni_3(Al,Ti)/Ni alloy composite was successfully synthesized from Ti_3AlC_2 (20 vol% and 40 vol%) and Ni starting powders via in-situ hot-pressing route at 1200 ℃ under 30 MPa. As the interleaved Al atoms diffused out from Ti_3AlC_2 nanolayers, Ti_3AlC_2 decomposed into nonstoichiometric nano-TiC_x particles while the additional Al and fractional Ti atoms reacted with Ni matrix to form Ni_3(Al,Ti). Due to the homogeneous distribution of ultrafine TiC_x and Ni_3(Al,Ti) particles in Ni matrix, Hardness, flexural strength and fracture toughness of the composite reinforced with 20 vol% of Ti_3AlC_2 increased 50%, 50% and 70%, in comparison with the pure Ni alloy prepared under the same condition. In addition, the positive temperature dependence of flexural strength was detected in 40vol%Ti_3AlC_2-Ni alloy sample in the temperature range of 20 ℃ and 700 ℃, and the maximum of flexural strength could reach 989 ± 28 MPa at 700 ℃.
机译:本研究成功地在1200℃,30 MPa的条件下,通过原位热压法,由20体积%和40体积%的Ti_3AlC_2和Ni起始粉末成功合成了新型的TiC_x-Ni_3(Al,Ti)/ Ni合金复合材料。 。随着交错的Al原子从Ti_3AlC_2纳米层中扩散出来,Ti_3AlC_2分解为非化学计量的纳米TiC_x颗粒,而其他Al和部分Ti原子与Ni基体反应形成Ni_3(Al,Ti)。由于超细TiC_x和Ni_3(Al,Ti)颗粒在Ni基体中的均匀分布,与20%(体积)的Ti_3AlC_2增强的复合材料相比,其硬度,弯曲强度和断裂韧性分别提高了50%,50%和70%。在相同条件下制备的纯镍合金。此外,在20℃和700℃的温度范围内,在40vol%Ti_3AlC_2-Ni合金样品中检测到弯曲强度的正温度依赖性,在700℃时最大弯曲强度可达989±28 MPa。

著录项

  • 来源
    《Materials Science and Engineering》 |2017年第14期|48-54|共7页
  • 作者单位

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

    Institute of Materials Science and Engineering, School of Mechanical and Electronic Control Engineering, Beijing Jiaotong University, Beijing 100044, China,Key Laboratory of Vehicle Advanced Manufacturing, Measuring and Control Technology (Beijing Jiaotong University), Ministry of Education, Beijing, China;

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

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

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

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

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

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

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Ni-based composites; Ti_3AlC_2; TiC_x; Ni_3(AlTi); Hot-press sintering; Mechanical properties;

    机译:镍基复合材料;Ti_3AlC_2;TiC_x;Ni_3(AlTi);热压烧结;机械性能;

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