Abstract
The influence of melt temperature on the glass formation, physical properties and local structure of (Fe71.2B24Y4.8)96Nb4bulk metallic glass (BMG) was investigated through X-ray diffractometry, differential scanning calorimetry, thermal dilatation, and Mössbauer spectra tests. Amorphous alloys were formed by fast cooling of the melt from the temperature range of 1573-1773 K. BMG cast from 1623 K has lower Curie temperature and larger spontaneous volume magnetostriction, i.e., stronger Invar effect. The abnormality, which can not be eliminated by annealing, is attributed to the higher amount of Fe-Fe pairs indicated by the hyperfine field distribution. This special local structure is inherited from the melt, which has a liquid-liquid change manifested by an exothermic step region at the temperature range of 1615-1650 K. Through a slow-cooling process, the melt in the liquid-liquid change is frozen to a crystalline structure contained Y2Fe17phase with a high intensity signal. These findings help explain the correlation between the liquid-liquid change and the structure of cooling products.
| Original language | English |
|---|---|
| Pages (from-to) | 6900-6906 |
| Number of pages | 7 |
| Journal | Journal of Materials Science |
| Volume | 49 |
| Issue number | 20 |
| DOIs | |
| Publication status | Published - 1 Jan 2014 |
ASJC Scopus subject areas
- General Materials Science
- Mechanics of Materials
- Mechanical Engineering