Anomalous phonon stiffening associated with the (1 1 1) antiphase boundary in L12 Ni3Al

Venkateswara Rao Manga, Shunli Shang, William Yi Wang, Yi Wang, Jiang Liang, Vincent Henry Crespi, Zi-kui Liu

Research output: Contribution to journalArticle

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Abstract

Antiphase boundaries (APBs) play a crucial role in the anomalous yield behavior exhibited by Ni3Al with L12 structure. We investigated the changes in the vibrational properties associated with the formation of (0 0 1) and (1 1 1) APBs in Ni3Al by employing first-principles calculations. The phonon density of states of Ni3Al with and without (0 0 1) and (1 1 1) APBs revealed an interesting result: the (0 0 1) APB softens the phonons in its vicinity, while the (1 1 1) stiffens them. We also calculated the finite-temperature (0 0 1) and (1 1 1) APB Gibbs free energies from the first-principles quasi-harmonic approximation. The vibrational entropy of formation is positive (e.g. 0.053 mJ K-1 m-2 at 300 K) for the (0 0 1) APB and is negative (e.g. -0.0157 mJ K-1 m-2 at 300 K) for the (1 1 1) APB over the entire temperature range. We also find a significant change in the thermal electronic free energy due to the creation of the (0 0 1) or (1 1 1) APB. The anisotropy ratio of the APB energies, i.e. the ratio of the (1 1 1) APB free energy to the (0 0 1) APB free energy, changes from 2.9 at 300 K to 15.9 at 1000 K.

Original languageEnglish (US)
Pages (from-to)287-294
Number of pages8
JournalActa Materialia
Volume82
DOIs
StatePublished - Jan 1 2015

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Free energy
Gibbs free energy
Phonons
Anisotropy
Entropy
Temperature
Hot Temperature

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

Cite this

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title = "Anomalous phonon stiffening associated with the (1 1 1) antiphase boundary in L12 Ni3Al",
abstract = "Antiphase boundaries (APBs) play a crucial role in the anomalous yield behavior exhibited by Ni3Al with L12 structure. We investigated the changes in the vibrational properties associated with the formation of (0 0 1) and (1 1 1) APBs in Ni3Al by employing first-principles calculations. The phonon density of states of Ni3Al with and without (0 0 1) and (1 1 1) APBs revealed an interesting result: the (0 0 1) APB softens the phonons in its vicinity, while the (1 1 1) stiffens them. We also calculated the finite-temperature (0 0 1) and (1 1 1) APB Gibbs free energies from the first-principles quasi-harmonic approximation. The vibrational entropy of formation is positive (e.g. 0.053 mJ K-1 m-2 at 300 K) for the (0 0 1) APB and is negative (e.g. -0.0157 mJ K-1 m-2 at 300 K) for the (1 1 1) APB over the entire temperature range. We also find a significant change in the thermal electronic free energy due to the creation of the (0 0 1) or (1 1 1) APB. The anisotropy ratio of the APB energies, i.e. the ratio of the (1 1 1) APB free energy to the (0 0 1) APB free energy, changes from 2.9 at 300 K to 15.9 at 1000 K.",
author = "Manga, {Venkateswara Rao} and Shunli Shang and Wang, {William Yi} and Yi Wang and Jiang Liang and Crespi, {Vincent Henry} and Zi-kui Liu",
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Anomalous phonon stiffening associated with the (1 1 1) antiphase boundary in L12 Ni3Al. / Manga, Venkateswara Rao; Shang, Shunli; Wang, William Yi; Wang, Yi; Liang, Jiang; Crespi, Vincent Henry; Liu, Zi-kui.

In: Acta Materialia, Vol. 82, 01.01.2015, p. 287-294.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Anomalous phonon stiffening associated with the (1 1 1) antiphase boundary in L12 Ni3Al

AU - Manga, Venkateswara Rao

AU - Shang, Shunli

AU - Wang, William Yi

AU - Wang, Yi

AU - Liang, Jiang

AU - Crespi, Vincent Henry

AU - Liu, Zi-kui

PY - 2015/1/1

Y1 - 2015/1/1

N2 - Antiphase boundaries (APBs) play a crucial role in the anomalous yield behavior exhibited by Ni3Al with L12 structure. We investigated the changes in the vibrational properties associated with the formation of (0 0 1) and (1 1 1) APBs in Ni3Al by employing first-principles calculations. The phonon density of states of Ni3Al with and without (0 0 1) and (1 1 1) APBs revealed an interesting result: the (0 0 1) APB softens the phonons in its vicinity, while the (1 1 1) stiffens them. We also calculated the finite-temperature (0 0 1) and (1 1 1) APB Gibbs free energies from the first-principles quasi-harmonic approximation. The vibrational entropy of formation is positive (e.g. 0.053 mJ K-1 m-2 at 300 K) for the (0 0 1) APB and is negative (e.g. -0.0157 mJ K-1 m-2 at 300 K) for the (1 1 1) APB over the entire temperature range. We also find a significant change in the thermal electronic free energy due to the creation of the (0 0 1) or (1 1 1) APB. The anisotropy ratio of the APB energies, i.e. the ratio of the (1 1 1) APB free energy to the (0 0 1) APB free energy, changes from 2.9 at 300 K to 15.9 at 1000 K.

AB - Antiphase boundaries (APBs) play a crucial role in the anomalous yield behavior exhibited by Ni3Al with L12 structure. We investigated the changes in the vibrational properties associated with the formation of (0 0 1) and (1 1 1) APBs in Ni3Al by employing first-principles calculations. The phonon density of states of Ni3Al with and without (0 0 1) and (1 1 1) APBs revealed an interesting result: the (0 0 1) APB softens the phonons in its vicinity, while the (1 1 1) stiffens them. We also calculated the finite-temperature (0 0 1) and (1 1 1) APB Gibbs free energies from the first-principles quasi-harmonic approximation. The vibrational entropy of formation is positive (e.g. 0.053 mJ K-1 m-2 at 300 K) for the (0 0 1) APB and is negative (e.g. -0.0157 mJ K-1 m-2 at 300 K) for the (1 1 1) APB over the entire temperature range. We also find a significant change in the thermal electronic free energy due to the creation of the (0 0 1) or (1 1 1) APB. The anisotropy ratio of the APB energies, i.e. the ratio of the (1 1 1) APB free energy to the (0 0 1) APB free energy, changes from 2.9 at 300 K to 15.9 at 1000 K.

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