Abstract
The influence of conventional and accumulative HPT (Acc. HPT) process on structural properties of Zr62Cu22Al10Fe5Dy1 metallic glass (MG) phase is examined by X-ray diffraction (XRD) technique. The XRD results showed that HPT process leads to free volume generation in MG. Free volume increases with the number of anvil turns in the conventional HPT process, while the highest free volume increment was observed in Acc. HPT process. To understand the role of latent crystalline phases on free volume, thermal stability and crystallization kinetics of Zr62Cu22Al10Fe5Dy1 MG are investigated by non-isothermal heating using differential scanning calorimetry (DSC). Thermal investigation indicates Dy addition results in increased activation energy along with lower nucleation rate during crystallization. As the initial amorphous phase significantly influences crystallization behavior, d-spacing analysis of amorphous hump is carried out to predict latent crystalline phases. Strong correlation was observed between latent crystalline phases and intermetallic compounds in devitrified Zr62Cu22Al10Fe5Dy1 alloy.
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