Dual nanoinclusions of reduced graphene oxides (rGOs) and metal nanoparticles (NPs) were introduced into Al and Bi co-doped Mg2Si thermoelectric (TE) compounds to enhance their fracture toughness (∼0.82 MPa m1/2 for pristine Mg1.96Al0.04Si0.97Bi0.03). The TE performance of Mg1.96Al0.04Si0.97Bi0.03 decreased by the introduction of nanoscale inclusions, mainly owing to the deterioration of the electronic transport properties originated from increased electron scattering. However, a significantly enhanced fracture toughness of 2.26 MPa m1/2 was achieved by the introduction of 3 vol% rGOs (∼5 nm thick and ∼3 μm wide) and 0.6 vol% Sn NPs (50–150 nm), owing to the simultaneous activation of three different inhibition mechanisms for crack propagation: bridging of cracks, sheet pullout within the crack, and deflection of crack propagation.
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea Grant ( 2017R1A2A1A17069528 ) funded by the Korea government (MSIT) .
© 2019 Elsevier B.V.
All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry