Papers by Keyword: Interdiffusion

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Authors: Toshitada Shimozaki, Takahisa Okino, C.G. Lee, O. Taguchi
Abstract: In general, only one Kirkendall plane can be seen in a diffusion couple. However, bifurcate or trifurcate Kirkendall planes have been reported in Ti/TiAl3 or Co/CoSi2 multi-phase diffusion couples (M-couple) [1,2]. The authors [3] have previously shown a numerical technique to analyze the movement of multiple markers (M-M) embedded in a M-couple taking the molar volume change effect to the diffusion direction into account. Using this technique, one can visualize the places where vacancies (lattice planes) are annihilated or generated in the couple. Here, we try to demonstrate the bifurcate or trifurcate Kirkendall planes in the M-couple and clarify the limited conditions of bifurcate or trifurcate Kirkendall planes by using this numerical technique.
Authors: M. Danielewski, B. Wierzba, K. Tkacz-Śmiech
Abstract: Interdiffusion plays a significant role in the formation and stability of metallic joints and coatings. It is also of critical importance in designing advanced materials. Because commercial alloys are usually multicomponent, the key target is prediction of a complex morphology of the diffusion zone which grows between the alloys, alloy-coating, etc. In a two-component system, the diffusion zone can be composed of single-phase layers of the intermetallic compounds and solid solutions. The evolution of the composition and thicknesses of such layers are fairly well understood and consistent with the phase diagrams. The situation is qualitatively different in multicomponent systems. For example, the diffusion zone in a ternary system can be composed of single-and two-phase sublayers. Their number and thicknesses depend on the initial conditions, i.e. composition, component diffusivities and geometry of the system. The usual way of presenting the sequence of the layers and their compositions is by drawing a diffusion path which is, by definition, a mapping of the stationary concentrations onto the isothermal section of the equilibrium phase diagram. The diffusion path connects initial compositions of the diffusion couple and can go across the single-, two-and three-phase fields. It starts at the composition of one alloy and ends at the other. The possibility of mapping the concentration profiles onto the ternary isotherm has been postulated in one from the seventeen theorems by Kirkaldy and Brown [] for the diffusion path. The detailed presentation of all theorems was recently done by Morral []. Here we remind the reader only of the chosen ones (shown in italics).
Authors: Sergiy V. Divinski, Alexander V. Pokoev, Neelamegan Esakkiraja, Aloke Paul
Abstract: High entropy alloys (HEAs) are considered as a novel class of materials with a large number of components (five and more) available in equiatomic or nearly equatomic proportions. One of the characteristic properties of HEAs was believed to be so-called 'sluggish' diffusion that should be crucial for intended high-temperature technological applications. The faith on this myth instead of rigorous experimental analysis played such a dominant role that the first set of data on interdi usion, in fact based on an improper analysis, were cited in hundreds of articles to state the presence of sluggishness of di usion rates in high entropy alloys.
Authors: Michael Atzmon, E.W. Larsen
Authors: O.A. Alexeev, A.A. Shmakov, E.A. Smirnov
Authors: O.A. Alexeev, A.A. Shmakov, E.A. Smirnov
Authors: Soma Prasad, Aloke Paul
Abstract: The diffusion study in the V-Si system is reviewed. We show that the indirect method used previously to determine the diffusion parameters draws unnecessary error. Rather the method developed by Wagner should be used to calculate the diffusion parameters directly from the composition profile.
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