点击次数：

论文类型： 期刊论文

发表时间： 2014-06-28

发表刊物： JOURNAL OF MATERIALS RESEARCH

收录刊物： SCIE、EI、Scopus

卷号： 29

期号： 12

页面范围： 1362-1368

ISSN号： 0884-2914

摘要： (Cu0.47Zr0.45Al0.08)(100-x)Dy-x (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.