TY - JOUR
T1 - Effect of the cooling rate on the mechanical properties of Ti-Ni-Cu-Zr-based crystal/glassy alloys
AU - Jiang, J.
AU - Ketov, S.
AU - Kato, H.
AU - Louzguine-Luzgin, D. V.
N1 - Funding Information:
This work was partly supported by the World Premier International Research Center Initiative (WPI), MEXT, and Institute for Materials Research (IMR), Tohoku University, Japan.
Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2017/9/17
Y1 - 2017/9/17
N2 - Ti-Ni-Cu-Zr-based crystal/glassy dual-phase alloy samples with different sizes and good mechanical properties were manufactured. The structure of these samples was examined via X-ray Diffraction, Scanning Electron Microscopy, and Transmission Electron Microscopy. The developed dual-phase structure alloys combine the high strength of glassy alloys and plasticity of crystalline alloys. Plastic deformation was enhanced by this dual-phase structure. Mechanical characterization of the alloys revealed three deformation stages, namely a martensitic transformation, dislocation slip in a crystalline phase, and shear deformation of the glassy matrix. Two types of effects involving the martensitic transformation were observed: superelastic behavior and the transformation induced plasticity (TRIP) effect, which provide an additional deformation mechanism and lead to a significant increase in the plasticity of these dual-phase samples. The results indicate that the fraction of glassy phase occurring in large rods formed at lower cooling rates is lower than that occurring in smaller rods; therefore, the deformation-induced martensitic transformation of the crystalline cP2 phase in the large samples occurs at lower stresses.
AB - Ti-Ni-Cu-Zr-based crystal/glassy dual-phase alloy samples with different sizes and good mechanical properties were manufactured. The structure of these samples was examined via X-ray Diffraction, Scanning Electron Microscopy, and Transmission Electron Microscopy. The developed dual-phase structure alloys combine the high strength of glassy alloys and plasticity of crystalline alloys. Plastic deformation was enhanced by this dual-phase structure. Mechanical characterization of the alloys revealed three deformation stages, namely a martensitic transformation, dislocation slip in a crystalline phase, and shear deformation of the glassy matrix. Two types of effects involving the martensitic transformation were observed: superelastic behavior and the transformation induced plasticity (TRIP) effect, which provide an additional deformation mechanism and lead to a significant increase in the plasticity of these dual-phase samples. The results indicate that the fraction of glassy phase occurring in large rods formed at lower cooling rates is lower than that occurring in smaller rods; therefore, the deformation-induced martensitic transformation of the crystalline cP2 phase in the large samples occurs at lower stresses.
KW - Cooling rate
KW - Crystal/glassy alloys
KW - Mechanical properties
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U2 - 10.1016/j.msea.2017.08.016
DO - 10.1016/j.msea.2017.08.016
M3 - Article
AN - SCOPUS:85026896139
SN - 0921-5093
VL - 704
SP - 147
EP - 153
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
ER -