کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1585274 | 1514913 | 2006 | 8 صفحه PDF | دانلود رایگان |
Bulk metallic glasses (BMGs) exhibit inhomogeneous deformation under loading at room temperature due to the formation of highly localized shear bands, which leads to a catastrophic failure. We present recent advances in the processing technique, and in the further understanding of the relationship between the microstructure and mechanical behavior of Zr-based BMG composites (BMGCs). By adding Nb to Zr–Ni–Cu–Al, nanocrystalline-particle-containing BMGCs were synthesized in an as-cast condition without subsequent heat treatments. High-resolution transmission electron microscopy results show that the addition of 2 atomic percent (at.%) Nb introduces nanocrystals with an average size in the range of 1–3 nm. Differential-scanning calorimetry and differential-thermal analyses indicate that the glass-forming ability increased after adding Nb. The compressive plasticity of the Nb-containing BMGC at room temperature is significantly improved (about 3%), when compared to the monolithic BMGs (about 0.1–0.3%) with an increase in the compressive strength from 1820 to 1860 MPa.
Journal: Materials Science and Engineering: A - Volume 431, Issues 1–2, 15 September 2006, Pages 158–165