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Ti3AlC2顆粒含量對Ti3AlC2/ZA27 復(fù)合材料性能的影響
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北京交通大學(xué),北京交通大學(xué),北京交通大學(xué),北京交通大學(xué),北京交通大學(xué),北京交通大學(xué)

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中央高?；究蒲袠I(yè)務(wù)費


Effect of Ti3AlC2 content on mechanical properties of Ti3AlC2/ZA27 composites
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School of Mechanical Electronic Control Engineering,Beijing Jiaotong University,School of Mechanical Electronic Control Engineering,Beijing Jiaotong University,School of Mechanical Electronic Control Engineering,Beijing Jiaotong University,School of Mechanical Electronic Control Engineering,Beijing Jiaotong University,School of Mechanical Electronic Control Engineering,Beijing Jiaotong University,School of Mechanical Electronic Control Engineering,Beijing Jiaotong University

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    摘要:

    通過無壓燒結(jié)技術(shù)和機械合金化技術(shù)，在燒結(jié)溫度為870 °C，保溫時間為2.5h的工藝條件下，制備了四種不同體積含量的Ti3AlC2 顆粒含量的Ti3AlC2/ZA27復(fù)合材料。研究了Ti3AlC2 顆粒含量對Ti3AlC2 /ZA27復(fù)合材料的硬度，密度，拉伸強度和彎曲強度的影響。結(jié)果表明界面處的微弱的化學(xué)反應(yīng)有助于提高復(fù)合材料的界面結(jié)合能力，進而提高Ti3AlC2 /ZA27復(fù)合材料的機械性能。此外，隨著Ti3AlC2 顆粒含量增多，Ti3AlC2 /ZA27復(fù)合材料的硬度和力學(xué)強度都隨之增大，這主要歸因于納米尺度的Ti3AlC2顆粒的彌散增強結(jié)果。然而，隨著Ti3AlC2 顆粒的增加到40 vol. %, 由于孔隙的增多，Ti3AlC2 /ZA27復(fù)合材料的硬度和力學(xué)強度又出現(xiàn)下降。對比制得的四種Ti3AlC2 /ZA27復(fù)合材料，30Ti3AlC2/ZA27復(fù)合材料擁有最大的抗拉強度、抗彎曲強度以及維氏硬度，分別為310 MPa，528 MPa 和1.24 GPa. 這些優(yōu)異的性能除了歸因于良好的界面結(jié)合，還歸因于Ti3AlC2顆粒的細晶強化和彌散強化作用。

    Abstract:

    ZA27 alloy-based composites reinforced by 10–40 vol. % Ti3AlC2 particles in a step of 10 vol. % were prepared by pressurelessly sintering mechanical alloyed powders at 870 °C for 2.5 h. The effects of Ti3AlC2 content on hardness, density, stretching and bending performance were studied. The results demonstrate that a well bonded interface could be obtained by weak reaction occurred at the interface between Ti3AlC2 and ZA27 alloy during sintering process, and which is beneficial to the mechanical properties of the Ti3AlC2 /ZA27 composites. An increase in Ti3AlC2 content (up to 30 vol. %) leads to enhanced hardness and mechanical strength of the composites due to dispersion strengthening of nano-sized Ti3AlC2 particle. However, with an increase in Ti3AlC2 content to 40 vol. %, the hardness and strength decrease because of the growing number of pores. Comparing the four composites with different Ti3AlC2 contents, the 30Ti3AlC2 /ZA27 composite possesses the best properties of 310 MPa for tensile strength, 528 MPa for bending strength and 1.24 GPa for Vickers hardness. Besides the good interfacial bonding, the improved mechanical properties of the Ti3AlC2 /ZA27 composites are also attributed to the fine-grained microstructure and well dispersed reinforcements.

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李海燕,周洋,崔傲,李世波,黃振鶯,翟洪祥. Ti3AlC2顆粒含量對Ti3AlC2/ZA27 復(fù)合材料性能的影響[J].稀有金屬材料與工程,2018,47(4):1069~1074.[Hai-Yan Li, Yang Zhou, Ao Cui, Shi-Bo Li, Zhen-Ying Huang, Hong-Xiang Zhai. Effect of Ti3AlC2 content on mechanical properties of Ti3AlC2/ZA27 composites[J]. Rare Metal Materials and Engineering,2018,47(4):1069~1074.]
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  • 收稿日期:2016-05-11
  • 最后修改日期:2016-09-16
  • 錄用日期:2016-10-18
  • 在線發(fā)布日期: 2018-05-31
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