TY - JOUR
T1 - Constitutive model for high temperature deformation behavior of Ti-Zr-Ni-Be bulk metallic glass in supercooled liquid region
AU - Jun, H. J.
AU - Lee, K. S.
AU - Kato, H.
AU - Kim, H. S.
AU - Chang, Y. W.
N1 - Funding Information:
This work was supported by the Strategic Technology Development Program of the Korean Ministry of Knowledge Economy (MKE). This work has been progressed with the approval of Professor Anand and the authors appreciate deeply for that. HSK acknowledges the NRF-JSPS internatinal collaboration project. This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Korea Government (MEST) (No. 2010-0026981 ).
PY - 2012/8
Y1 - 2012/8
N2 - A constitutive equation based on a free volume model, that describes the strain rate dependent deformation behavior of bulk metallic glasses (BMGs) within the supercooled liquid region, has been modified in this paper in order to reproduce the stress increment that occurs due to crystalline phase formation during lengthy exposure to high temperature in compression deformation. A comparison of the simulated results obtained from finite element analyzes with the compression test results for Ti-Zr-Ni-Be BMG alloy has been conducted to determine the validity of the proposed model. Plastic deformation modes such as Newtonian and non-Newtonian viscous flows of this BMG alloy were found to be reproduced well by the finite element method simulations combined with the free volume based constitutive relations and to show a phenomenon of stress increment deviated from the steady state. Therefore, the constitutive relations introduced here are expected to allow accurate reproduction of the high temperature behavior and better estimation of the formability of BMG alloys.
AB - A constitutive equation based on a free volume model, that describes the strain rate dependent deformation behavior of bulk metallic glasses (BMGs) within the supercooled liquid region, has been modified in this paper in order to reproduce the stress increment that occurs due to crystalline phase formation during lengthy exposure to high temperature in compression deformation. A comparison of the simulated results obtained from finite element analyzes with the compression test results for Ti-Zr-Ni-Be BMG alloy has been conducted to determine the validity of the proposed model. Plastic deformation modes such as Newtonian and non-Newtonian viscous flows of this BMG alloy were found to be reproduced well by the finite element method simulations combined with the free volume based constitutive relations and to show a phenomenon of stress increment deviated from the steady state. Therefore, the constitutive relations introduced here are expected to allow accurate reproduction of the high temperature behavior and better estimation of the formability of BMG alloys.
KW - Bulk metallic glass
KW - Constitutive model
KW - Finite element method
KW - High temperature deformation
KW - Supercooled liquid region
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U2 - 10.1016/j.commatsci.2012.04.006
DO - 10.1016/j.commatsci.2012.04.006
M3 - Article
AN - SCOPUS:84860556060
SN - 0927-0256
VL - 61
SP - 213
EP - 223
JO - Computational Materials Science
JF - Computational Materials Science
ER -