Room temperature mechanical properties of polycrystalline YbAl3, a promising low temperature thermoelectric material

Robert D. Schmidt, Eldon D. Case, Gloria J. Lehr, Donald T. Morelli

Research output: Contribution to journalArticle

  • 10 Citations

Abstract

Intermetallic YbAl3 in the L12 (AuCu3) phase is a promising material for low temperature thermoelectric applications. However, there is no experimental data in the literature on the mechanical properties of YbAl3, although the design and development of thermoelectric modules incorporating YbAl3 will require mechanical property data. Using resonant ultrasound spectroscopy (RUS), the room temperature Young's modulus, shear modulus, bulk modulus and Poisson's ratio were determined as a function of volume fraction porosity, P, for specimens densified by both hot pressing (HP) and pulsed electric current sintering (PECS) polycrystalline specimens, where P ranged from 0.030 to 0.233 and mean grain sizes ranged from 0.5 to 1.4 μm. In addition, the longitudinal and acoustic wave speeds and the Debye temperature were measured. Using Vickers indentation, the hardness and fracture toughness of the specimens were also measured. Despite microstructural differences between the HP and PECS-processed specimens, the porosity dependence of the mechanical properties was a function of the total volume fraction porosity, P, independent of the details of the size and spatial distribution of pores within individual specimens.

LanguageEnglish (US)
Pages15-24
Number of pages10
JournalIntermetallics
Volume35
DOIs
StatePublished - 2013

Profile

Spark plasma sintering
Porosity
Elastic moduli
Hot pressing
Mechanical properties
Volume fraction
Debye temperature
Poisson ratio
Indentation
Temperature
Spatial distribution
Intermetallics
Fracture toughness
Ultrasonics
Hardness
Acoustic waves
Spectroscopy

Keywords

  • A. Aluminides, miscellaneous
  • B. Elastic properties
  • B. Mechanical properties at ambient temperature

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Chemistry
  • Metals and Alloys
  • Chemistry(all)

Cite this

Room temperature mechanical properties of polycrystalline YbAl3, a promising low temperature thermoelectric material. / Schmidt, Robert D.; Case, Eldon D.; Lehr, Gloria J.; Morelli, Donald T.

In: Intermetallics, Vol. 35, 2013, p. 15-24.

Research output: Contribution to journalArticle

@article{6ee4b319bcd74adf99f6f39e3ba04568,
title = "Room temperature mechanical properties of polycrystalline YbAl3, a promising low temperature thermoelectric material",
abstract = "Intermetallic YbAl3 in the L12 (AuCu3) phase is a promising material for low temperature thermoelectric applications. However, there is no experimental data in the literature on the mechanical properties of YbAl3, although the design and development of thermoelectric modules incorporating YbAl3 will require mechanical property data. Using resonant ultrasound spectroscopy (RUS), the room temperature Young's modulus, shear modulus, bulk modulus and Poisson's ratio were determined as a function of volume fraction porosity, P, for specimens densified by both hot pressing (HP) and pulsed electric current sintering (PECS) polycrystalline specimens, where P ranged from 0.030 to 0.233 and mean grain sizes ranged from 0.5 to 1.4 μm. In addition, the longitudinal and acoustic wave speeds and the Debye temperature were measured. Using Vickers indentation, the hardness and fracture toughness of the specimens were also measured. Despite microstructural differences between the HP and PECS-processed specimens, the porosity dependence of the mechanical properties was a function of the total volume fraction porosity, P, independent of the details of the size and spatial distribution of pores within individual specimens.",
keywords = "A. Aluminides, miscellaneous, B. Elastic properties, B. Mechanical properties at ambient temperature",
author = "Schmidt, {Robert D.} and Case, {Eldon D.} and Lehr, {Gloria J.} and Morelli, {Donald T.}",
year = "2013",
doi = "10.1016/j.intermet.2012.11.019",
language = "English (US)",
volume = "35",
pages = "15--24",
journal = "Intermetallics",
issn = "0966-9795",
publisher = "Elsevier Limited",

}

TY - JOUR

T1 - Room temperature mechanical properties of polycrystalline YbAl3, a promising low temperature thermoelectric material

AU - Schmidt,Robert D.

AU - Case,Eldon D.

AU - Lehr,Gloria J.

AU - Morelli,Donald T.

PY - 2013

Y1 - 2013

N2 - Intermetallic YbAl3 in the L12 (AuCu3) phase is a promising material for low temperature thermoelectric applications. However, there is no experimental data in the literature on the mechanical properties of YbAl3, although the design and development of thermoelectric modules incorporating YbAl3 will require mechanical property data. Using resonant ultrasound spectroscopy (RUS), the room temperature Young's modulus, shear modulus, bulk modulus and Poisson's ratio were determined as a function of volume fraction porosity, P, for specimens densified by both hot pressing (HP) and pulsed electric current sintering (PECS) polycrystalline specimens, where P ranged from 0.030 to 0.233 and mean grain sizes ranged from 0.5 to 1.4 μm. In addition, the longitudinal and acoustic wave speeds and the Debye temperature were measured. Using Vickers indentation, the hardness and fracture toughness of the specimens were also measured. Despite microstructural differences between the HP and PECS-processed specimens, the porosity dependence of the mechanical properties was a function of the total volume fraction porosity, P, independent of the details of the size and spatial distribution of pores within individual specimens.

AB - Intermetallic YbAl3 in the L12 (AuCu3) phase is a promising material for low temperature thermoelectric applications. However, there is no experimental data in the literature on the mechanical properties of YbAl3, although the design and development of thermoelectric modules incorporating YbAl3 will require mechanical property data. Using resonant ultrasound spectroscopy (RUS), the room temperature Young's modulus, shear modulus, bulk modulus and Poisson's ratio were determined as a function of volume fraction porosity, P, for specimens densified by both hot pressing (HP) and pulsed electric current sintering (PECS) polycrystalline specimens, where P ranged from 0.030 to 0.233 and mean grain sizes ranged from 0.5 to 1.4 μm. In addition, the longitudinal and acoustic wave speeds and the Debye temperature were measured. Using Vickers indentation, the hardness and fracture toughness of the specimens were also measured. Despite microstructural differences between the HP and PECS-processed specimens, the porosity dependence of the mechanical properties was a function of the total volume fraction porosity, P, independent of the details of the size and spatial distribution of pores within individual specimens.

KW - A. Aluminides, miscellaneous

KW - B. Elastic properties

KW - B. Mechanical properties at ambient temperature

UR - http://www.scopus.com/inward/record.url?scp=84871127379&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84871127379&partnerID=8YFLogxK

U2 - 10.1016/j.intermet.2012.11.019

DO - 10.1016/j.intermet.2012.11.019

M3 - Article

VL - 35

SP - 15

EP - 24

JO - Intermetallics

T2 - Intermetallics

JF - Intermetallics

SN - 0966-9795

ER -