TY - JOUR
T1 - Mechanical properties of microconstituents in Nb-Si-Ti alloy by micropillar compression and nanoindentation
AU - Guo, Enyu
AU - Singh, Sudhanshu S.
AU - Kaira, Chandrashekara S.
AU - Meng, Xianyu
AU - Xu, Yanjin
AU - Luo, Liangshun
AU - Wang, Mingyue
AU - Chawla, Nikhilesh
N1 - Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2017/2/27
Y1 - 2017/2/27
N2 - The micromechanical properties of both Nb solid solution (Nbss) and (Nb,Ti)3Si silicide in a ternary Nb-16Si-22Ti (in at%) alloy were evaluated by nanoindentation and micropillar compression techniques. Nanoindentation tests showed that (Nb,Ti)3Si possesses much higher hardness (15.6±0.6 GPa) and Young's modulus (253.3±8.4 GPa) than Nbss (5.2±0.4 GPa and 124.9±5.1 GPa, respectively). Stress-strain curves of each constituent were obtained by micropillar compression. The stress-strain behavior showed that (Nb,Ti)3Si exhibited a brittle fracture mode, while Nbss was able to bear large ductile deformation. The compressive failure strength of (Nb,Ti)3Si intermetallic and yield strength of Nbss were found to be 8.4±1.2 GPa and 0.9±0.1 GPa, respectively. The fracture toughness of the (Nb,Ti)3Si phase evaluated by cracks emanating from nanoindentation, was measured to be ~2.3 MPa-m1/2.
AB - The micromechanical properties of both Nb solid solution (Nbss) and (Nb,Ti)3Si silicide in a ternary Nb-16Si-22Ti (in at%) alloy were evaluated by nanoindentation and micropillar compression techniques. Nanoindentation tests showed that (Nb,Ti)3Si possesses much higher hardness (15.6±0.6 GPa) and Young's modulus (253.3±8.4 GPa) than Nbss (5.2±0.4 GPa and 124.9±5.1 GPa, respectively). Stress-strain curves of each constituent were obtained by micropillar compression. The stress-strain behavior showed that (Nb,Ti)3Si exhibited a brittle fracture mode, while Nbss was able to bear large ductile deformation. The compressive failure strength of (Nb,Ti)3Si intermetallic and yield strength of Nbss were found to be 8.4±1.2 GPa and 0.9±0.1 GPa, respectively. The fracture toughness of the (Nb,Ti)3Si phase evaluated by cracks emanating from nanoindentation, was measured to be ~2.3 MPa-m1/2.
KW - Fracture toughness
KW - High temperature alloy
KW - Intermetallics
KW - Mechanical properties
KW - Micropillar compression
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U2 - 10.1016/j.msea.2017.01.058
DO - 10.1016/j.msea.2017.01.058
M3 - Article
AN - SCOPUS:85010457005
SN - 0921-5093
VL - 687
SP - 99
EP - 106
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
ER -