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  • Küçük Resim
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    Dispersion-strengthening effect of Cu-based Mn, Al, and Zn rich alloys
    (Elsevier Science Sa, 2004) Sari, U; Agan, S; Aksoy, I; Guven, K; Kahveci, N
    In this systematic study, dispersion-strengthening effect of the Cu-25.91Mn (wt.%), Cu-26.62Mn-8.99Al (wt.%), Cu-22.17Mn-12.32Zn (wt.%) ingot alloys have been investigated. Samples were homogenized at a high fixed temperature in different periods and cooled with different cooling rates. After processes, microanalysis of the samples were interpreted by using scanning electron microscope (SEM) and weight percentages of the elements of the occurrence phases in the samples obtained by using electron dispersion spectroscopy (EDS) technique. Additionally, some characteristic properties of the heat treated samples with different conditions of Cu-Mn, Cu-Mn-Al, Cu-Mn-Zn ingot alloys were also discussed. (C) 2003 Elsevier B.V. All rights reserved.
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    Prism coupling technique investigation of elasto-optical properties of thin polymer films
    (Amer Inst Physics, 2004) Ay, F; Kocabas, A; Kocabas, C; Aydinli, A; Agan, S
    The use of thin polymer films in optical planar integrated optical circuits is rapidly increasing. Much interest, therefore, has been devoted to characterizing the optical and mechanical properties of thin polymer films. This study focuses on measuring the elasto-optical properties of three different polymers; polystyrene, polymethyl-methacrylate, and benzocyclobutane. The out-of-plane elastic modulus, refractive index, film thickness, and birefringence of thin polymer films were determined by means of the prism coupling technique. The effect of the applied stress on the refractive index and birefringence of the films was investigated. Three-dimensional finite element method analysis was used so as to obtain the principal stresses for each polymer system, and combining them with the stress dependent refractive index measurements, the elasto-optic coefficients of the polymer films were determined. It was found that the applied stress in the out-of-plane direction of the thin films investigated leads to negative elasto-optic coefficients, as observed for all the three thin polymer films. (C) 2004 American Institute of Physics.