Abstract
Composites consisting of a bulk metallic glass (BMG) matrix and metallic fibers or particulates have been shown to exhibit superior mechanical properties as compared to monolithic BMGs. To understand the role of reinforcements in this improvement, it is necessary to investigate the state of internal stresses in these composites. These stresses arise from the thermal expansion mismatch between the reinforcement and the matrix, as well as the elastic and plastic incompatibilities between the two phases. Neutron diffraction and synchrotron X-ray diffraction were used to measure these mismatch-induced stresses in BMG-matrix composites with various reinforcements: continuous W fibers, W or Ta particles, and dendritic, in-situ formed precipitates. The results are compared to numerical and analytical predictions of internal stresses.
| Original language | English |
|---|---|
| Pages (from-to) | L9.3.1-L9.3.6 |
| Journal | Materials Research Society Symposium - Proceedings |
| Volume | 644 |
| Publication status | Published - 2001 |
| Externally published | Yes |
| Event | Supercooled Liquid, Bulk Glassy and Nanocrystalline states of Alloys - Boston, MA, United States Duration: 27 Nov 2000 → 30 Nov 2000 |
Funding
This study was supported at Caltech by the Army Research Office (grant no. DAAD19-00-1-0379) and the National Science Foundation via a MRSEC Grant. It also benefited from the national user facility at the Lujan Center, LANSCE and the DND-CAT, APS supported by the Department of Energy under contracts W-7405-ENG-36 and W-31-102-Eng-38, respectively. The specimens were provided by Professor W.L. Johnson (Caltech) and co-workers.
| Funders | Funder number |
|---|---|
| National Science Foundation | |
| U.S. Department of Energy | W-7405-ENG-36, W-31-102-Eng-38 |
| Army Research Office | DAAD19-00-1-0379 |
| American Pain Society | |
| Materials Research Science and Engineering Center, Harvard University |