Thermal grain boundary grooving with anisotropic surface free energies

Zhang, W; Sachenko, P.; Gladwell, I.

doi:10.1016/j.actamat.2003.08.033

Cited by 44 publications

(41 citation statements)

References 26 publications

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“…In [8][9][10], the authors and others study anisotropic surface free energy for 2D grain boundary grooving with 1D surfaces and its effect on the evolution of surface morphology under surface diffusion without using regularization or adding corner energy. In Refs.…”

Section: Introductionmentioning

confidence: 99%

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Thermal grain boundary grooving with anisotropic surface free energy in three dimensions

Zhang

Gladwell

2005

Journal of Crystal Growth

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Section: Introductionmentioning

confidence: 99%

“…In Refs. [8,11], they classify the anisotropy as mild, critical and severe based on the stability of the evolution equation and the characteristics of surface morphology. When the anisotropy is mild, the evolution equation is stable and the surface is smooth.…”

Section: Introductionmentioning

confidence: 99%

Thermal grain boundary grooving with anisotropic surface free energy in three dimensions

Zhang

Gladwell

2005

Journal of Crystal Growth

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“…Notably, the theory suggests that the occurrence and absence of humps on both sides of the grain boundary helps to discern between diffusion-controlled and dissolution-controlled grooves. A number of analytical and numerical approaches extended Mullins' seminal work by considering large slopes (Robertson, 1971), anisotropy of surface energies (Zhang et al, 2004), tilted grain boundaries (Hackl et al, 2012;Min and Wong, 2006), diffusion in a multicomponent system (Dhalenne et al, 1979;Klinger, 2002), and the effect of mobile crystal defects (Rabkin et al, 2001). The geometry of the groove is sensitive to these extensions but general features of the Mullins' theory are mostly maintained while the absolute grooving kinetics are altered.…”

Section: Thermal Groovingmentioning

confidence: 99%

Transport processes at quartz–water interfaces: constraints from hydrothermal grooving experiments

et al. 2014

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Abstract. We performed hydrothermal annealing experiments on quartzite samples at temperatures of 392 to 568 • C and fluid pressures of 63 to 399 MPa for up to 120 h, during which hydrothermal grooves developed on the free surfaces of the samples. An analysis of surface topology and groove characteristics with an atomic force microscope revealed a range of surface features associated with the simultaneous and successive operation of several processes partly depending on crystal orientation during the various stages of an experiment. Initially, dissolution at the quartzite-sample surface occurs to saturate the fluid in the capsule with SiO 2 . Subsequently, grooving controlled by diffusion processes takes place parallel to dissolution and precipitation due to local differences in solubility. Finally, quench products develop on grain surfaces during the termination of experiments. The average groove-root angle amounts to about 160 • , varying systematically with misorientation between neighboring grains and depending slightly on temperature and run duration. The grooving is thermally activated, i.e., groove depth ranging from 5 nm to several micrometers for the entire suite of experiments generally increases with temperature and/or run time. We use Mullins' classical theories to constrain kinetic parameters for the transport processes controlling the grooving. In the light of previous measurements of various diffusion coefficients in the system SiO 2 -H 2 O, interface diffusion of Si is identified as the most plausible rate-controlling process. Grooving could potentially proceed faster by diffusion through the liquid if the fluid were not convecting in the capsule. Characteristic times of healing of microfractures in hydrous environments constrained from these kinetic parameters are consistent with the order of magnitude of timescales over which postseismic healing occurs in situ according to geophysical surveys and recurrence intervals of earthquakes.

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“…Recently, thermal etching has been the subject of a number of experimental studies in metals/intermetallics in which atomic force microscopy or scanning probe microscopy has been utilised to characterize thermal grooves [7,[23][24][25][26]. With these techniques it is possible to measure the groove topography and dihedral angle at the root of the groove with high accuracy.…”

Section: Introductionmentioning

confidence: 99%