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Title: Superelastic and micaceous deformation in the intermetallic compound CaFe2As2

Journal Article · · Scripta Materialia
 [1];  [2];  [1];  [1];  [3];  [3];  [1]
  1. Univ. of Connecticut, Storrs, CT (United States)
  2. Colorado State Univ., Fort Collins, CO (United States)
  3. Ames Lab., Ames, IA (United States)
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Single-crystalline intermetallic compound CaFe2As2 are known to exhibit both superelasticity and micaceous plasticity, but these phenomena have not been studied in detail. Here we report a study of the elastic and plastic deformation behaviors for CaFe2As2 single crystals grown in Sn-flux solution. The anisotropic mechanical response has been studied using micropillar compression tests performed in-situ within a scanning electron microscope. Further, these data are compared with density functional theory calculations to develop an understanding of micaceous plasticity in terms of strongly anisotropic generalized stacking fault energies. The results of this work will offer design guidelines to produce mechanically robust superelastic structures.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
National Aeronautics and Space Administration (NASA); FEI Company; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; USDOE
Grant/Contract Number:
AC02-07CH11358; NNX16AR60G
OSTI ID:
1434320
Alternate ID(s):
OSTI ID: 1549656
Report Number(s):
IS-J-9474; PII: S1359646217304098
Journal Information:
Scripta Materialia, Vol. 141; ISSN 1359-6462
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (21)

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Solidification microstructures in Ag3Sn–Cu3Sn pseudo-binary alloys journal April 2016
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Energy barrier for homogeneous dislocation nucleation: Comparing atomistic and continuum models journal June 2011
Stabilization of an ambient-pressure collapsed tetragonal phase in CaFe 2 As 2 and tuning of the orthorhombic-antiferromagnetic transition temperature by over 70 K via control of nanoscale precipitates journal April 2011
Single crystal pillar microcompression tests of the MAX phases Ti2InC and Ti4AlN3 journal August 2013
Thermal cycling behaviors of thermal barrier coatings on intermetallic Ni3Al based superalloy journal May 2003
Structural, magnetic and superconducting phase transitions in CaFe2As2 under ambient and applied pressure journal May 2009
Lattice collapse and quenching of magnetism in CaFe 2 As 2 under pressure: A single-crystal neutron and x-ray diffraction investigation journal January 2009
Size dependence of the yield strength of fcc and bcc metallic micropillars with diameters of a few micrometers journal April 2012
Effect of pressure on transport and magnetotransport properties in CaFe 2 As 2 single crystals journal July 2009
Anisotropic impurity states, quasiparticle scattering and nematic transport in underdoped Ca(Fe1−xCox)2As2 journal February 2013
Micropillar compression deformation of single crystals of the intermetallic compound ζ-FeZn13 journal February 2014
Size dependence of mechanical properties of gold at the micron scale in the absence of strain gradients journal April 2005
Uniaxial versus hydrostatic pressure-induced phase transitions in CaFe 2 As 2 and BaFe 2 As 2 journal March 2012
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Figures / Tables (4)

Fig. 1(p. 15)figure Fig. 1
Fig. 2(p. 16)figure Fig. 2
Fig. 3(p. 17)figure Fig. 3
Fig. 4(p. 19)figure Fig. 4

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Related Subjects

36 MATERIALS SCIENCE
Plasticity
Superelasticity
Intermetallic compound
Micropillar compression
Density functional theory