Volume 31 Issue 2
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LENG Wen-xiu, TIAN Wen-huai. Attractive interaction between precipitates and dislocation and soft precipitation strengthening in L12-Co3Ti intermetallic compounds[J]. Chinese Journal of Engineering, 2009, 31(2): 193-197. DOI: 10.13374/j.issn1001-053x.2009.02.015
Citation: LENG Wen-xiu, TIAN Wen-huai. Attractive interaction between precipitates and dislocation and soft precipitation strengthening in L12-Co3Ti intermetallic compounds[J]. Chinese Journal of Engineering, 2009, 31(2): 193-197. DOI: 10.13374/j.issn1001-053x.2009.02.015
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Attractive interaction between precipitates and dislocation and soft precipitation strengthening in L12-Co3Ti intermetallic compounds

  • 1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;

  • 2. Department of Mathematics and Physics, China Petroleum University (Beijing), Beijing 102249, China

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  • Received Date: February 17, 2008
  • Available Online: August 08, 2021
    Graphical Abstract
    • Abstract
  • The variation in hardness of 80Co-20Ti intermetallic compounds with aging time was investigated, and the change in yield strength of aged 80Co-20Ti intermetallic compounds undergoing aging and containing precipitates with temperature was tested. Transmission electron microscope (TEM) observations reveal that the precipitates are L12Co precipitates with simple fee crystal structure. Although the hardness of the precipitates is less than that of Co3Ti matrix phase, the Co3Ti hardens appreciably by fine precipitation of disordered fee Co-rich phase. The precipitates are perfectly coherent with the matrix lattice at the beginning of aging. The shape of the precipitates is platelet and is nearly parallel to the[100]planes of the L12-ordered matrix. It is indicated that the interaction between L12Co precipitates and deformation dislocations is attractive interaction and this type of interaction plays an important contribution to the hardening. The strengthening mechanism deduced from the attractive interaction between the soft precipitation and hard matrix was also discussed.
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