Abstract
In situ diffraction experiments were performed with high-energy synchrotron X-rays to examine load partitioning and high-stress relaxation during uniaxial compression of a bulk metallic glass composite containing both ductile tantalum particles and crystallized matrix material. The tantalum particles yielded at an applied stress of -800 MPa, while the matrix precipitates remained elastic up to the maximum applied stress of -1250 MPa. The von Mises effective stress in the tantalum particles at yielding was 1500 MPa, well in excess of typical tantalum yield stresses, which is attributed to a combination of solid-solution strengthening and the inhibition of dislocation motion in the 1-2 μm particles. A series of constant crosshead-position measurements made at -1250 MPa suggested the possibility of room-temperature matrix relaxation under high applied loads.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 176-180 |
| Number of pages | 5 |
| Journal | Journal of Non-Crystalline Solids |
| Volume | 317 |
| Issue number | 1-2 |
| DOIs | |
| State | Published - Mar 2003 |
| Event | Advances in Metallic Glasses - Seattle, WA, United States Duration: Feb 17 2002 → Feb 21 2002 |
Funding
This study was supported by the Center for Structural Amorphous Metals (ARO grant no. DAAD19-01-0525). D.K.B. gratefully acknowledges the Department of Defense for support in the form of an NDSEG Fellowship. E.U. was supported by the Army Research Office (grant no. DAAD19-00-1-0379). The authors are grateful to Dr H. Choi-Yim (California Institute of Technology) for fabricating the specimen and for helpful discussions. The diffraction experiment was performed at the DuPont-Northwestern-Dow Collaborative Access Team (DND-CAT) at the Advanced Photon Source, the help of whose staff is greatly appreciated. DND-CAT is supported by the E.I. DuPont de Nemours & Co., The Dow Chemical Company, the US National Science Foundation through Grant DMR-9304725 and the State of Illinois through the Department of Commerce and the Board of Higher Education Grant IBHE HECA NWU 96. Use of the Advanced Photon Source was supported by the US Department of Energy, Basic Energy Sciences, Office of Energy Research under contract no. W-31-102-Eng-38.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Materials Chemistry