Air oxidation of a Zr58Cu22Al12Fe8 bulk metallic glass at 350–550°C

Oxidation features of plastic deformed Zr-based bulk metallic glass

“…This agrees with the results of other Zr-based BMGs [4][5][6][7][8]. The amorphous samples remain the amorphous state after the oxidation experiments below 450 • C as shown in Fig.…”

“…Increase in free volume, nanocrystallization and formation of nano voids in shear bands are all possible [15,17]. Significant nanocrystallization may not occur here, as nanocrystallization is often found to be more oxidation resistant than the amorphous state in Zr-based metallic glasses [4][5][6][7][8]. The slower oxidation for the crystalline specimens here also supports this point.…”

“…Although many works have been done for studying the oxidation behaviors of MGs, mechanisms of oxidation are still not very clear [1][2][3][4][5][6][7][8][9][10]. For example, metallic glasses (or amorphous alloys) are in general believed to be more oxidation and corrosion resistant in comparison to their crystalline counterparts, due to the lack of any crystal-like microstructure, such as grain boundaries, which would otherwise act as local active sites for corrosion and oxidation [2,3].…”

“…For example, metallic glasses (or amorphous alloys) are in general believed to be more oxidation and corrosion resistant in comparison to their crystalline counterparts, due to the lack of any crystal-like microstructure, such as grain boundaries, which would otherwise act as local active sites for corrosion and oxidation [2,3]. On the other hand, there is also a large amount of metallic glass systems which show poorer oxidation resistance with respect to their crystalline counterparts [4][5][6][7][8]. The easier oxidation can be explained in terms of the presence of extra free volume in MGs, which provides an easy, short circuit path for the inward diffusion of oxygen.…”

High thermal stability of the amorphous oxide in Ti44.5Cu44.5Zr7Be4 metallic glass

“…The oxidation in the SCL region becomes more critical, when metallic glasses have a wider SCL region. [28][29][30][31][32] Previous study shows that formation of the oxide layer with an amorphous structure is one of the solutions in improving the oxidation resistance in the SCL state. 33,34 Since the amorphous oxide has a more dense-packed atomic structure than the counterpart crystalline oxide, the diffusion rate of oxygen and metal ions can be effectively suppressed.…”