Transgranular liquation cracking of grains in the semi-solid state

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Transgranular liquation cracking of grains in the semi-solid state. / Karagadde, S.; Lee, P. D.; Cai, B.; Fife, J. L.; Azeem, M. A.; Kareh, K. M.; Puncreobutr, C.; Tsivoulas, D.; Connolley, T.; Atwood, R. C.

In: Nature Communications, Vol. 6, 8300, 01.12.2015.

Research output: Contribution to journalArticle

Harvard

Karagadde, S, Lee, PD, Cai, B, Fife, JL, Azeem, MA, Kareh, KM, Puncreobutr, C, Tsivoulas, D, Connolley, T & Atwood, RC 2015, 'Transgranular liquation cracking of grains in the semi-solid state', Nature Communications, vol. 6, 8300. https://doi.org/10.1038/ncomms9300

APA

Karagadde, S., Lee, P. D., Cai, B., Fife, J. L., Azeem, M. A., Kareh, K. M., Puncreobutr, C., Tsivoulas, D., Connolley, T., & Atwood, R. C. (2015). Transgranular liquation cracking of grains in the semi-solid state. Nature Communications, 6, [8300]. https://doi.org/10.1038/ncomms9300

Vancouver

Author

Karagadde, S. ; Lee, P. D. ; Cai, B. ; Fife, J. L. ; Azeem, M. A. ; Kareh, K. M. ; Puncreobutr, C. ; Tsivoulas, D. ; Connolley, T. ; Atwood, R. C. / Transgranular liquation cracking of grains in the semi-solid state. In: Nature Communications. 2015 ; Vol. 6.

Bibtex

@article{6718e976cd8e48b3b478c27e3562468c,
title = "Transgranular liquation cracking of grains in the semi-solid state",
abstract = "Grain refinement via semi-solid deformation is desired to obtain superior mechanical properties of cast components. Using quantitative in situ synchrotron X-ray tomographic microscopy, we show an additional mechanism for the reduction of grain size, via liquation assisted transgranular cracking of semi-solid globular microstructures. Here we perform localized indentation of Al-15wt.%Cu globular microstructures, with an average grain size of ∼ 480μm, at 555 deg;C (74% solid fraction). Although transgranular fracture has been observed in brittle materials, our results show transgranular fracture can also occur in metallic alloys in semi-solid state. This transgranular liquation cracking (TLC) occurs at very low contact stresses (between 1.1 and 38 €‰MPa). With increasing strain, TLC continues to refine the size of the microstructure until the grain distribution reaches log-normal packing. The results demonstrate that this refinement, previously attributed to fragmentation of secondary arms by melt-shearing, is also controlled by an additional TLC mechanism.",
keywords = "Mechanical properties, Metals and alloys",
author = "S. Karagadde and Lee, {P. D.} and B. Cai and Fife, {J. L.} and Azeem, {M. A.} and Kareh, {K. M.} and C. Puncreobutr and D. Tsivoulas and T. Connolley and Atwood, {R. C.}",
year = "2015",
month = dec,
day = "1",
doi = "10.1038/ncomms9300",
language = "English",
volume = "6",
journal = "Nature Communications",
issn = "2041-1723",
publisher = "Springer",

}

RIS

TY - JOUR

T1 - Transgranular liquation cracking of grains in the semi-solid state

AU - Karagadde, S.

AU - Lee, P. D.

AU - Cai, B.

AU - Fife, J. L.

AU - Azeem, M. A.

AU - Kareh, K. M.

AU - Puncreobutr, C.

AU - Tsivoulas, D.

AU - Connolley, T.

AU - Atwood, R. C.

PY - 2015/12/1

Y1 - 2015/12/1

N2 - Grain refinement via semi-solid deformation is desired to obtain superior mechanical properties of cast components. Using quantitative in situ synchrotron X-ray tomographic microscopy, we show an additional mechanism for the reduction of grain size, via liquation assisted transgranular cracking of semi-solid globular microstructures. Here we perform localized indentation of Al-15wt.%Cu globular microstructures, with an average grain size of ∼ 480μm, at 555 deg;C (74% solid fraction). Although transgranular fracture has been observed in brittle materials, our results show transgranular fracture can also occur in metallic alloys in semi-solid state. This transgranular liquation cracking (TLC) occurs at very low contact stresses (between 1.1 and 38 €‰MPa). With increasing strain, TLC continues to refine the size of the microstructure until the grain distribution reaches log-normal packing. The results demonstrate that this refinement, previously attributed to fragmentation of secondary arms by melt-shearing, is also controlled by an additional TLC mechanism.

AB - Grain refinement via semi-solid deformation is desired to obtain superior mechanical properties of cast components. Using quantitative in situ synchrotron X-ray tomographic microscopy, we show an additional mechanism for the reduction of grain size, via liquation assisted transgranular cracking of semi-solid globular microstructures. Here we perform localized indentation of Al-15wt.%Cu globular microstructures, with an average grain size of ∼ 480μm, at 555 deg;C (74% solid fraction). Although transgranular fracture has been observed in brittle materials, our results show transgranular fracture can also occur in metallic alloys in semi-solid state. This transgranular liquation cracking (TLC) occurs at very low contact stresses (between 1.1 and 38 €‰MPa). With increasing strain, TLC continues to refine the size of the microstructure until the grain distribution reaches log-normal packing. The results demonstrate that this refinement, previously attributed to fragmentation of secondary arms by melt-shearing, is also controlled by an additional TLC mechanism.

KW - Mechanical properties

KW - Metals and alloys

UR - http://www.scopus.com/inward/record.url?scp=84941595671&partnerID=8YFLogxK

U2 - 10.1038/ncomms9300

DO - 10.1038/ncomms9300

M3 - Article

AN - SCOPUS:84941595671

VL - 6

JO - Nature Communications

JF - Nature Communications

SN - 2041-1723

M1 - 8300

ER -