Abstract
Rapidly quenched Pd82Si18 ribbon was prepared by melt spinning. The thermal stability and non-isothermal crystallization kinetics of Pd82Si18 amorphous ribbon were investigated by differential scanning calorimeter measurements. Its structure was investigated by X-ray diffraction and transmission electronic microscopy. The activation energy was calculated by the Kissinger method, and the nucleation and growth during non-isothermal crystallization were investigated by the local activation energy and local Avrami exponent. The average activation energy for Pd82Si18 amorphous ribbon based on the Kissinger method is 330.672 kJ/mol, indicating that it has high thermal stability. The local activation energy of the glass ribbon was determined by the Kissinger–Akahira–Sunose method, and the local Avrami exponent was obtained based on the Johnson–Mehl–Avrami model. The calculated local activation energy increases to a maximum when the crystallization column fraction reaches 0.3, and it then decreases, which shows that crystallization is a multistep process. The local Avrami exponent indicates that the crystallization process of Pd82Si18 amorphous ribbon is controlled by volume nucleation with three-dimensional growth at various nucleation rates.
Highlights
Metallic glasses, with no crystal grains and grain boundaries unlike their crystalline counterparts, have attracted great attention since they were discovered in 1960.1 For example, a large number of studies have been performed to investigate Pd–Si and Pd–Si–(Cu–Au) metallic glasses because of their combination of high thermal stability,[2] simple constituents,[3] high glass forming ability,[4,5] and high hardness.[6]
We have investigated the crystallization transformation kinetics of the non-isothermal modes of Pd82Si18 glass ribbon
The main findings are as follows: (1) The large activation energies indicate that Pd82Si18 amorphous ribbon exhibits excellent thermal stability
Summary
With no crystal grains and grain boundaries unlike their crystalline counterparts, have attracted great attention since they were discovered in 1960.1 For example, a large number of studies have been performed to investigate Pd–Si and Pd–Si–(Cu–Au) metallic glasses because of their combination of high thermal stability,[2] simple constituents,[3] high glass forming ability,[4,5] and high hardness.[6]. During the process of thermoplastic forming (TPF), crystallization or partial crystallization of BMGs will lead to drastic degradation of the mechanical properties.[9,10] In other words, crystallization makes the parts of the BMG unsafe. Investigation of the crystallization kinetics is important to provide the crystallization and transformation mechanisms and for designing TPF processes.[11]
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