Details
| Original language | English |
|---|---|
| Pages (from-to) | 2875-2881 |
| Number of pages | 7 |
| Journal | Materials Science and Engineering A |
| Volume | 528 |
| Issue number | 6 |
| Publication status | Published - 15 May 2011 |
| Externally published | Yes |
Abstract
CoNiAl alloys are a new class of shape memory alloys, which exhibit pseudoelastic strains as high 6% over a broad range of temperatures. Based on the crystallographic lattice constants, a substantial volume change upon transformation is expected at the mesoscopic level, yet it has not been measured previously. Transformation strains are established in three mutually orthogonal directions in the [001]-oriented CoNiAl single crystals under compression. Experiments reveal that the transformation volume change is approximately 2% based on determination of strains on transformed and untransformed locations. Despite the high volumetric strain, the pseudoelastic stress-strain response represents full recoverability with small stress hysteresis. Additional factors that influence pseudoelasticity behavior are discussed particularly the Md-Af interval and the flow resistance, which are both higher for CoNiAl compared to other shape memory alloys.
Keywords
- Critical stress, Digital image correlation, Hysteresis, Phase transformation, Pseudoelasticity, Volume change
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
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In: Materials Science and Engineering A, Vol. 528, No. 6, 15.05.2011, p. 2875-2881.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - On the volume change in Co-Ni-Al during pseudoelasticity
AU - Dilibal, S.
AU - Sehitoglu, H.
AU - Hamilton, R. F.
AU - Maier, H. J.
AU - Chumlyakov, Y.
N1 - Funding information: The work is supported by a grant from the National Science Foundation , CMMI 09-26813 .
PY - 2011/5/15
Y1 - 2011/5/15
N2 - CoNiAl alloys are a new class of shape memory alloys, which exhibit pseudoelastic strains as high 6% over a broad range of temperatures. Based on the crystallographic lattice constants, a substantial volume change upon transformation is expected at the mesoscopic level, yet it has not been measured previously. Transformation strains are established in three mutually orthogonal directions in the [001]-oriented CoNiAl single crystals under compression. Experiments reveal that the transformation volume change is approximately 2% based on determination of strains on transformed and untransformed locations. Despite the high volumetric strain, the pseudoelastic stress-strain response represents full recoverability with small stress hysteresis. Additional factors that influence pseudoelasticity behavior are discussed particularly the Md-Af interval and the flow resistance, which are both higher for CoNiAl compared to other shape memory alloys.
AB - CoNiAl alloys are a new class of shape memory alloys, which exhibit pseudoelastic strains as high 6% over a broad range of temperatures. Based on the crystallographic lattice constants, a substantial volume change upon transformation is expected at the mesoscopic level, yet it has not been measured previously. Transformation strains are established in three mutually orthogonal directions in the [001]-oriented CoNiAl single crystals under compression. Experiments reveal that the transformation volume change is approximately 2% based on determination of strains on transformed and untransformed locations. Despite the high volumetric strain, the pseudoelastic stress-strain response represents full recoverability with small stress hysteresis. Additional factors that influence pseudoelasticity behavior are discussed particularly the Md-Af interval and the flow resistance, which are both higher for CoNiAl compared to other shape memory alloys.
KW - Critical stress
KW - Digital image correlation
KW - Hysteresis
KW - Phase transformation
KW - Pseudoelasticity
KW - Volume change
UR - http://www.scopus.com/inward/record.url?scp=79151486642&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2010.12.056
DO - 10.1016/j.msea.2010.12.056
M3 - Article
AN - SCOPUS:79151486642
VL - 528
SP - 2875
EP - 2881
JO - Materials Science and Engineering A
JF - Materials Science and Engineering A
SN - 0921-5093
IS - 6
ER -