Structure and mechanical properties of amorphous Fe84Nb7B9 alloy during crystallisation

Purpose: The investigation results of crystallization, in temperature range of 300-700 degrees centigrade in time 1 h, of amorphous Fe84Nb7B9 alloy. The alloy was obtained in tape form by planar-flow-casting method. Design/methodology/approach: The structure was characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD) method. The measurement of mechanical properties, like: tensile strength Rm, ductility E and cracking energy Ep, were made. Tensile tests were performed on testing machine INSTRON 1195. Plastic properties of investigated tapes were determined in bending test. Unit cracking energy Ep was evaluated by carrying out the tear test by the use of tensile testing machine INSTRON 1195. Findings: The changes of mechanical properties and fracture morphology being connected with the structure changes involved by crystallization process have been stated. Practical implications: The relationship between heat treatment parameters and mechanical properties can be useful for practical application of these alloys. Originality/value: It has been stated that heat treatment leads to crystallization of two-stage character.