Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8044453 | Vacuum | 2018 | 9 Pages |
Abstract
Crystallization kinetics of the Zr70-xNi14+xAl16 (xâ¯=â¯0, 5, 10, 15, and 20â¯at.%) metallic glasses (MGs) was investigated using the non-isothermal and isothermal methods, respectively. The crystallization of the Zr70-xNi14+xAl16 (xâ¯=â¯15 and 20â¯at.%) MGs proceeds by the nucleation and growth of Zr2Ni3Al5 and Zr6NiAl2 crystals. The crystallization sequence of the Zr70-xNi14+xAl16 (x = 0, 5, and 10 at.%) MGs can be concluded as follows: amorphous phase â amorphous phase + Zr2Ni3Al5 + ZrNiAl crystals â Zr6NiAl2 crystals. The crystallization kinetics of the initial and intermediate stages for the present system changes from the diffusion-controlled one-dimensional growth to two- and three-dimensional growth. Compared with the Zr70-xNi14+xAl16 (xâ¯=â¯15 and 20â¯at.%) MGs, the nucleation and growth during the initial crystallization of the Zr70-xNi14+xAl16 (xâ¯=â¯0, 5, and 10â¯at.%) MGs are relatively faster, which should be contributed to their lower activation energies for initial crystallization. The subsequent crystallization proceeds by a slower nucleation and growth compared with the Zr70-xNi14+xAl16 (xâ¯=â¯15 and 20â¯at.%) MGs, which should be suppressed by the endothermic phase transition from Zr2Ni3Al5 and ZrNiAl crystals to Zr6NiAl2 crystals. The present studies could give a complementary understanding on crystallization behaviors of metastable alloys.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Surfaces, Coatings and Films
Authors
Xiaoliang Han, Fuli Ding, Yusheng Qin, Dianyu Wu, Hui Xing, Yue Shi, Kaikai Song, Chongde Cao,