TY - JOUR
T1 - Phase-separated microstructures and shear-banding behavior in a designed Zr-based glass-forming alloy
AU - Du, X.H.
AU - Huang, J.C.
AU - Chen, H.M.
AU - Chou, H.S.
AU - Lai, Y.H.
AU - Hsieh, K.C.
AU - Jang, J.S.C.
AU - Liaw, P.K.
PY - 2009/8
Y1 - 2009/8
N2 - We have employed a thermodynamic-computation approach to identify the composition of the Zr-Cu-Ni-Al alloy system exhibiting a two-liquid miscibility phase equilibrium in the liquid-temperature region, which tends to favor the occurrence of the liquid-phase separation. Guided by these calculated diagrams, a Zr-based alloy with a 10 at.% Al is designed, and its bulk-metallic glass (BMG) is prepared successfully by the copper-mould suction casting. A heterogeneous microstructure characterized by the existence of phase-separated regions with several to decades micrometers in size forms in the BMG. Under uniaxial compressive loading, the designed Zr-based BMG demonstrates the continuous "work hardening" and remarkable macroscopic plastic strain at room temperature. The improvement of mechanical properties is attributed to the unique glassy structure correlated with both the heterogeneous microstructure and the micro-scaled phase separation, leading to the extensive shear-band formation, interaction, and multiplication.
AB - We have employed a thermodynamic-computation approach to identify the composition of the Zr-Cu-Ni-Al alloy system exhibiting a two-liquid miscibility phase equilibrium in the liquid-temperature region, which tends to favor the occurrence of the liquid-phase separation. Guided by these calculated diagrams, a Zr-based alloy with a 10 at.% Al is designed, and its bulk-metallic glass (BMG) is prepared successfully by the copper-mould suction casting. A heterogeneous microstructure characterized by the existence of phase-separated regions with several to decades micrometers in size forms in the BMG. Under uniaxial compressive loading, the designed Zr-based BMG demonstrates the continuous "work hardening" and remarkable macroscopic plastic strain at room temperature. The improvement of mechanical properties is attributed to the unique glassy structure correlated with both the heterogeneous microstructure and the micro-scaled phase separation, leading to the extensive shear-band formation, interaction, and multiplication.
KW - B. Glasses, metallic
KW - B. Mechanical properties at ambient temperature
KW - E. Phase diagram, prediction
KW - F. Electron microscopy, transmission
UR - http://www.scopus.com/inward/record.url?scp=64449085217&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-64449085217&origin=recordpage
U2 - 10.1016/j.intermet.2009.01.019
DO - 10.1016/j.intermet.2009.01.019
M3 - RGC 21 - Publication in refereed journal
SN - 0966-9795
VL - 17
SP - 607
EP - 613
JO - Intermetallics
JF - Intermetallics
IS - 8
ER -