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117 results on '"Jiang, C.B."'

39. Half-metallic properties for the [Mn.sub.2]FeZ (Z=Al, Ga, Si, Ge, Sb) Heusler alloys: a first-principles study

Author

Luo, H.Z., Zhang, H.W., Zhu, Z.Y., Ma, L., Xu, S.F., Wu, G.H., Zhu, X.X., Jiang, C.B., and Xu, H.B.

Subjects
Density functionals -- Usage, Dipole moments -- Analysis, Manganese alloys -- Structure, Manganese alloys -- Magnetic properties, Manganese alloys -- Electric properties, Physics
Abstract

Density functional calculations are used for studying the electronic structure and magnetism of the [Mn.sub.2]FeZ (Z = Al, Ga, Si, Ge, Sb) Heusler alloys. The effect of lattice distortion on the half-metallicity and magnetic moments of [Mn.sub.2]FeZ has shown that the half-metallic properties of [Mn.sub.2]FeSb are insensitive to the lattice distortion.

Published
2008

40. On the fracture toughness of bulk metallic glasses under Berkovich nanoindentation.

Author

Jiang, C.B., Yang, B.J., Wang, J.Q., and Guo, H.

Subjects
*FRACTURE toughness, *METALLIC glasses, *CONTINUUM damage mechanics, *CRACK propagation (Fracture mechanics), *NANOINDENTATION
Abstract

Measurements of fracture toughness from the crack tip opening displacement (CTOD) testing methods are complex and paramount important for a range of bulk metallic glasses (BMGs). In this work, we attempted to propose an indentation protocol to evaluate indentation fracture toughness based on two key considerations: First, the plastic deformation induced damage to the characteristic fracture initiation point calculated from integrating the indentation load-displacement curves is obtained and used to estimate indentation fracture toughness. Second, the continuum damage mechanics theory has been adopted to identify the characteristic fracture initiation point. To verify the applicability of the suggested approach, fracture toughness values of BMGs were estimated and compared with those from CTOD tests in the literature. The estimated fracture toughness values K C obtained from the indentation tests agreed well with those K Q from the CTOD tests within an approximately relative difference of 10%. We also found that K Q linearly correlates with K C ( K Q = 1.1 K C − 3.7). The value of K Q in Al-based BMG is predicted to be ~ 35 MPa √ m. [ABSTRACT FROM AUTHOR]

Published
2018
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