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 - 2011/3/15
Y1 - 2011/3/15
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.
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U2 - 10.1016/j.msea.2010.12.056
DO - 10.1016/j.msea.2010.12.056
M3 - Article
AN - SCOPUS:79151486642
SN - 0921-5093
VL - 528
SP - 2875
EP - 2881
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
IS - 6
ER -