Growth of nickel-base superalloy bicrystals by the seeding technique with a modified Bridgman method

Chen, Gim S.; Aimone, Paul; Gao, Ming; Miller, Carl D.; Wei, Robert P.

doi:10.1016/s0022-0248(97)00134-6

Cited by 19 publications

(2 citation statements)

References 5 publications

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“…The orientation of the SC seeds was prearranged so that GB misorientations of the final castings could be controlled. Similar techniques to produce bulk BC specimens have been described earlier by Chen et al [16] Casting yield of BC specimens in the present investigation was very low. The results presented in Table II were based on more than 40 casting trials.…”

Section: Methodssupporting

confidence: 75%

Effect of grain-boundary characteristics on castability of nickel-base superalloys

Zhang

Singer

2004

Metall Mater Trans A

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Hot tearing susceptibility of two Ni-base superalloys, IN792 and CM247, during directional solidification was studied. Effects of grain-boundary (GB) misorientation on castability were examined by casting single-crystal (SC) and bicrystal (BC) specimens. Crack-free specimens were obtained in castings with GB misorientation angles of less than ϳ12 deg. Severe cracking occurred if the GB angle was greater than 25 deg. Secondary dendrite arm length right at the GB was found to be larger than in the GB vicinity and to increase with GB misorientation. The amount of eutectic melt and foreign element segregation is also larger at the GB. The greater susceptibility of the GB to hot tearing is almost certainly caused by reduced strength compared to the grain interior. The reduced strength is either due to reduced secondary arm bridging because of geometrical constraints or due to the existence of a thin liquid film as a result of stronger segregation.

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Section: Methodssupporting

confidence: 75%

Effect of grain-boundary characteristics on castability of nickel-base superalloys

Zhang

Singer

2004

Metall Mater Trans A

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“…If the growth procedure is successful, the resulting boundary remains parallel to the growth direction. In the past, various bicrystals containing different types of grain boundaries out of copper [1,15,16], brass [17], nickel-base superalloy [18], and ferrosilicon alloy [19] were successfully grown using this method, which usually involves the seeded growth of single crystals with pre-selected orientations. Nowadays, the vertical Bridgman technique is widely used to grow semiconducting crystals due to the excellent electrical properties of single-and bicrystals [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

On Melt Growth and Microstructure Characterization of Magnesium Bicrystals

Bissa,

Al-Samman,

Molodov

2024

Crystals

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Oriented magnesium bicrystals with a 45°101¯0 asymmetrical tilt boundary were produced by directional solidification in a vertical Bridgman furnace. Employing a partition in the cylindrical mold led to unwanted crystallization on the contact surface with the growing interface, disrupting the desired growth conditions for the boundary. A modified setup with seed crystals placed side by side in a conical mold addressed the former issue and enabled the production of high-quality 56 mm × ∅ 34 mm bicrystals. Due to the asymmetrical character of the boundary, the adjacent growing crystals witnessed unequal growth rates, with the basal-oriented crystal dominating the growth process. Plane strain compression experiments were carried out on bicrystalline samples extracted from the prepared bicrystal. The panoramic orientation mapping of large areas of several mm2 revealed low-angle boundaries (5° misorientation) associated with the curved segments of the original asymmetrical tilt boundary. It also depicted heterogeneous lattice rotation near the grain boundaries.

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Inter- and Transgranular Nucleation and Growth of Voids in Shock Loaded Copper Bicrystals

Fortin

Shaffer

Opie

et al. 2019

The Minerals, Metals &Amp; Materials Series

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Growth of nickel-base superalloy bicrystals by the seeding technique with a modified Bridgman method

Cited by 19 publications

References 5 publications

Effect of grain-boundary characteristics on castability of nickel-base superalloys

Effect of grain-boundary characteristics on castability of nickel-base superalloys

On Melt Growth and Microstructure Characterization of Magnesium Bicrystals

Inter- and Transgranular Nucleation and Growth of Voids in Shock Loaded Copper Bicrystals

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