Abstract
(Cu0.47Zr0.45Al0.08) 100-xDyx (x = 0, 1, 2, 3, 4; at.%) metallic glasses with greatly enhanced glass-forming ability (GFA) and plasticity were synthesized based on microalloying technique. The structure, thermal stability, and elastic properties of the BMG samples were studied by x-ray diffraction (XRD), differential scanning calorimetry (DSC), and ultrasonic measurements, respectively. With addition of minor dysprosium (Dy), fully metallic glassy rods with diameters exceeding 20 mm could be successfully fabricated by copper mold casting. In addition, the Cu-Zr-Al-Dy BMGs exhibit good mechanical properties under a compressive deformation mode, i.e., high yield strength of 1735-1906 MPa, Young's modulus of 85-100 GPa, and distinct plastic strain up to 4.02%. The strength and plasticity show remarkable correlations with glass transition temperature and Poisson's ratio, respectively. The role of minor Dy addition in enhancement in GFA and mechanical property of the Cu-rich BMGs is also discussed.
Original language | English |
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Pages (from-to) | 1362-1368 |
Number of pages | 7 |
Journal | Journal of Materials Research |
Volume | 29 |
Issue number | 12 |
DOIs | |
Publication status | Published - 2014 Jun 28 |
Keywords
- bulk metallic glass
- copper-rich alloys
- glass-forming ability
- mechanical property
- microalloying technique
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering