Abstract
The structural evolution of a Fe70Cr10B20 metallic glass was followed by means of in situ high-temperature neutron thermo-diffraction and magnetization measurements. Above 723 K the crystallization of bcc-Fe together with a metastable (FeCr)3B phase with tetragonal crystal structure (space group 14̄) is observed. Further heating gives rise to the transformation of the (FeCr)3B phase into another tetragonal (FeCr)2B phase (space group 14 / mcm) + bcc- Fe. On cooling down to room temperature no additional structural transformations occurred. This two-step crystallization process allows understanding quantitatively the intricate variation of the magnetization at high-temperature
Highlights
Fe-B based metallic glasses have been widely investigated, due to their technological interest derived from the excellent magnetic and mechanical properties [1], as well as from a basic point of view coming from the relationship between magnetism and the absence of long-range crystalline order [2]
The first step begins when the sample is heated above 650 K, the initial amorphous phase transforms into two crystalline phases, α-Fe with body centered cubic crystal structure (BCC) and Im3m
On heating up above 723 K several intensity peaks begin to grow superimposed to the amorphous contribution, clearly indicating that the crystallization process starts
Summary
Fe-B based metallic glasses have been widely investigated, due to their technological interest derived from the excellent magnetic and mechanical properties [1], as well as from a basic point of view coming from the relationship between magnetism and the absence of long-range crystalline order [2]. A good knowledge of the crystallization processes of Fe-B based metallic glasses and the crystallization products is of great importance in order to control their magnetic properties [11]. The first step begins when the sample is heated above 650 K, the initial amorphous phase transforms into two crystalline phases, α-Fe with body centered cubic crystal structure (BCC) and Im3m. Published under licence by IOP Publishing Ltd doi:10.1088/1742-6596/549/1/012018 symmetry, and metastable Fe3B with I4 tetragonal symmetry. The latter is a crystalline phase that only can be stabilized at RT by crystallization of FeB metallic glasses. The identification of the crystalline stable and metastable Fe(Cr)B phases appearing along the whole process provides an explanation for the irreversibility of the magnetization vs temperature curves on heating-cooling cycles
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