Universal Journal of Mechanical Engineering Vol. 5(4), pp. 124 - 129
DOI: 10.13189/ujme.2017.050403
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Elastic Interaction between Dislocation and Interface in Elastically Anisotropic Ceramic Bimaterials Al₂O₃-AlN: Image Force Effect

Ayadi Aicha ^*, Khalfallah Omar
Laboratory of Microstructure and Defect in Materials, Department of Physics, University Mentouri Constantine, Algeria

ABSTRACT

The Al₂O₃ and AlN materials are often used as electrical insulators (electronic substrates) also the case of pressure sensors where the aluminum nitride (AlN) is selected as the piezoelectric layer and the alumina (Al₂O₃) as a solid substrate insulating. This study aims to investigate the mobility of dislocations near the heterophase interface of bimaterials based alumina (Al₂O₃) under the effect of the image force, without the effect of temperature, deformation and external stress These dislocations having a Burgers vector b = 1/3 , they are located in Al₂O₃. The interface is defined by its plane parallel to the dislocation line and disorientation varies between 0 and 180^。 around the axis . Usually, the image force calculated in the context of the anisotropic linear elasticity using Barnett and Lothe theory with Stroh formalism, Fi = ΔE / d, where ΔE is the elastic interaction energy. The results show that dislocation motion under the image force effect depends on the elastic and crystallographic properties of the materials constituting the bicrystals and even disorientation of the interface which has an effect on the intensity of the elastic interaction energy. The dislocations are repelled to the interface if the difference in shear modulus between the two materials is positive (Δμ= μ₂ − μ₁>0), they are attracted to the interface in the opposite case (Δμ= μ₂ − μ₁<0).

KEYWORDS
Dislocations, Image Force, Peierls Stress, Elastic Anisotropy

Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] Ayadi Aicha , Khalfallah Omar , "Elastic Interaction between Dislocation and Interface in Elastically Anisotropic Ceramic Bimaterials Al₂O₃-AlN: Image Force Effect," Universal Journal of Mechanical Engineering, Vol. 5, No. 4, pp. 124 - 129, 2017. DOI: 10.13189/ujme.2017.050403.

(b). APA Format:
Ayadi Aicha , Khalfallah Omar (2017). Elastic Interaction between Dislocation and Interface in Elastically Anisotropic Ceramic Bimaterials Al₂O₃-AlN: Image Force Effect. Universal Journal of Mechanical Engineering, 5(4), 124 - 129. DOI: 10.13189/ujme.2017.050403.