|About this Abstract
||2011 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses VIII
||Fatigue and Fracture Behavior of a Ca-Based Bulk-Metallic Glass
||Julian Raphael, Gongyao Wang, Peter Liaw, Oleg Senkov, Dan Miracle
|On-Site Speaker (Planned)
The compression and fatigue behavior of a Ca65Mg15Zn20 bulk-metallic glass (BMG) was studied in air at room temperature. During the preparation of cubical samples of the Ca65Mg15Zn20 for compression and fatigue investigations, small spherical cavities were found. Under both monotonic and cyclic compression loadings of the samples, fractures initiated at
these cavities and propagated in a direction generally parallel to the loading axis. Finite-element analysis (FEA) was used to model the fracture behavior. The FEA of a centrally located spherical void showed that under compression loading, large tensile stresses evolved in the cavities. The orientation of the maximum principal stress (P1) was found to be normal to the direction of crack propagation, which is consistent with the experimental finding. Stresses in deeply embedded adjacent voids and those in superficial voids were also studied. The influence of the void location in the cubical sample on the fracture behavior was quantitatively discussed.