Microstructure tailoring for property improvements by grain boundary engineering

Tan, Lizhen; Sridharan, Kumar; Allen, Todd R.; Nanstad, R.K.; McClintock, David A

doi:10.1016/j.jnucmat.2007.08.015

Cited by 129 publications

(56 citation statements)

References 17 publications

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“…These results can be compared to those in Refs. [23,27] where the microstructures of alloys 617 and 718 were found to remain relatively constant during either annealing or creep deformation. The stability of the special boundary fraction in those studies may be attributed to grain boundary pinning by the secondary phase precipitates, which inhibit grain boundary motion and improve microstructural stability in the creep-tested alloys.…”

Section: Grain Size and Grain Boundary Character Distributionmentioning

confidence: 99%

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Precipitate Redistribution during Creep of Alloy 617

Schlegel

Hopkins

Young

et al. 2009

Metall Mater Trans A

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Section: Grain Size and Grain Boundary Character Distributionmentioning

confidence: 99%

“…[21][22][23][24] Studies of nickel-based superalloys have shown that the precipitation of grain boundary carbides is affected by grain boundary type. Lim et al found coarse and irregular Cr-rich carbides (M 23 C 6 ) distributed on general grain boundaries in Inconel 690.…”

Section: Introductionmentioning

confidence: 99%

Precipitate Redistribution during Creep of Alloy 617

Schlegel

Hopkins

Young

et al. 2009

Metall Mater Trans A

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“…The GBCD and its mechanistic origin are of interest because the grain boundary network can affect bulk properties such as the mechanical response, transport kinetics or corrosion resistance [21,[26][27][28][29][30][31][32][33][34][35][36][37]. This point is exemplified by the widespread interest in grain boundary engineering [26][27][28][29]31,[34][35][36][37][38][39][40][41][42][43]. Although the GBCD is thought to be a sensitive indicator of materials properties and that it is possible to engineer a polycrystal by controlling the GBCD, little is known about the mechanism of how anisotropic distributions develop.…”

Section: Introductionmentioning

confidence: 99%

Mechanism for the development of anisotropic grain boundary character distributions during normal grain growth

Dillon

Rohrer

2009

Acta Materialia

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Grain boundaries in polycrystalline magnesia-doped alumina and yttrium aluminum garnet were classified as growing in area or shrinking in area on the basis of topology and curvature considerations. Measurements of dihedral angles at grain boundary thermal grooves were used to determine that the energies of the growing boundaries are, on average, lower than the energies of the shrinking boundaries. The observations also show that the length of a boundary is inversely correlated to its energy. The findings suggest that anisotropic grain boundary character distributions, which influence the properties of polycrystals, develop because higher-energy grain boundaries are preferentially eliminated from the network during grain growth.

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“…[31][32][33] The present finding thus provides an often overlooked avenue for optimizing radiation tolerance of nc materials through GB engineering. [34,35] One effective way to engineer an nc material with a large fraction of low-angle GBs is by growth of films on substrates, because texture can be easily introduced during such growth. The degree of texturing strongly depends on the specific material and on the growth conditions, but in some , it can approach the value of 100%, leading to the majority of GBs being low-angle.…”

mentioning

confidence: 99%