Interdiffusion and reaction between Zr and Al alloys from 425° to 625 °C

Dickson, J.; Zhou, Le; Puente, Ashley E. Paz y; Fu, Mian; Keiser, Dennis D.; Sohn, Yong Ho

doi:10.1016/j.intermet.2013.12.012

Cited by 20 publications

(3 citation statements)

References 8 publications

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“…For other systems that fulfil these two conditions, the same difficulty in reaching stationary conditions for reaction layer growth is hence likely be observed. This could be the case in the study by Dickson et al on solid-state interdiffusion between Zr and Al-Si alloys [11]. Several phases are detected in the interfacial reaction zone after 240h of heat treatment at 560°C between Zr and several Al-Si alloys containing 2 to 5wt.%Si: Al3Zr with Si substitution as well as silicides and some ternary compounds.…”

Section: Heat Treatment At 535°c: Times Longer Than 40hmentioning

confidence: 78%

“…The second type of solid-state diffusion couple is characterized by the formation of new phases at interfaces during the interdiffusion process, leading to what is called a reaction-diffusion process and a new complexity increment. The binary system is still the simplest case, as it can be addressed using the conventional equations of diffusion [10][11][12]. For both binary and higher-order systems, it has been shown that a complex microstructure can be obtained, including patterning of the spatial reaction layer sequence, because of the dissociation of the Kirkendall plane, which is not necessarily unique in such systems [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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Solid State Chemical Interaction Between Ti and Al-Si Alloys

Dezellus

Zhe

Gardiola

et al. 2021

J. Phase Equilib. Diffus.

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Diffusion couples of Ti and biphasic alloy Al-7wt%Si were produced and heat-treated at 535°C for between 1 and 200 hours. The nature and thickness of the phases present in the reaction layer sequence were characterized using conventional techniques such as microprobe analysis and transmission electron microscopy. For short interaction times the interfacial reaction layer consists mainly of silicides, whereas aluminides are formed after times longer than 40h. This variation in the spatial reaction layer sequence over time is explained by the biphasic nature of one of the diffusion couple end-members, with high activity for both elements, and by the huge difference between the composition of the first phase formed at the initial interface and the average composition of the biphasic end-member. This situation, which can no doubt be observed in other systems, illustrates the difficulty of confirming that a true diffusion path has been attained in a diffusion couple. Most of the criteria that were first proposed by Kirkaldy and Brown, can apparently be respected, but the system could continue shifting over time towards a more stable configuration. In some systems, as in the case of Al-Si-Ti, the slow kinetics can be problematic, making it impossible to predict a radical change in material properties.

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Section: Heat Treatment At 535°c: Times Longer Than 40hmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Solid State Chemical Interaction Between Ti and Al-Si Alloys

Dezellus

Zhe

Gardiola

et al. 2021

J. Phase Equilib. Diffus.

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“…Consequently, no long range diffusion is needed for the formation of crystalline Al 3 Zr from the amorphous phase. Furthermore, the Al 3 Zr phase is the dominant phase formed during interdiffusion of crystalline specimens, [63][64][65][66] suggesting that the nucleation barrier for the formation of crystalline Al 3 Zr in a crystalline diffusion couple is relatively low, which might hold as well in the amorphous phase.…”

Section: Results and Evaluationmentioning

confidence: 99%

Interdiffusion in amorphous AlxZr1-x alloys

Noah

Wang

Mittemeijer

2017

Journal of Applied Physics

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Interdiffusion in amorphous AlxZr1−x compositionally modulated multilayers was investigated by Auger electron spectroscopy sputter-depth profiling. Microstructural characterisation was performed by X-ray diffraction and cross-sectional transmission electron microscopy. The temperature-dependent chemical diffusion coefficient could be deduced at a series of temperatures in the range of 356 °C to 415 °C and was found to be weakly dependent on composition. The activation enthalpy for the chemical diffusion coefficients is slightly smaller at the composition of the Al-rich am-Al0.62Zr0.38 sublayer (1.6 eV) than at the composition of the Zr-rich am-Al0.27Zr0.73 sublayer (1.8 eV), which is not related to the concentration dependence of the excess free volume but to the smaller atomic size and mass of Al as compared to Zr. The smaller activation enthalpy for interdiffusion in partially crystallised specimens than in entirely amorphous AlxZr1−x multilayers is ascribed to the relatively large excess free volume in the grain boundaries of the nanocrystalline sublayers, as compared to the amorphous phase, at large Al concentrations. On the basis of an evaluation of the role of diffusion-induced stress in amorphous systems, it is shown that stresses induced by interdiffusion relax relatively fast by viscous flow and do not affect the determined diffusion coefficients.

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