Influence of the chemical composition of rapidly quenched amorphous alloys (Ni, Fe, Cr)-B-Si on its crystallization process

10th International School-Conference on Materials for Extreme Environment: Development, Production and Application

Elmanov, G.^1 ; Dzhumaev, P.^1 ; Ivanitskaya, E.^1 ; Skrytnyi, V.^1 ; Ruslanov, A.^1

National Research Nuclear University MEPhI, Moscow Engineering Physics Institute, Kashirskoe highway, 31, Moscow

115409, Russia^1

关键词: American Welding Society;    Chemical compositions;    Crystallization process;    Crystallization stage;    Energy dispersive x ray microanalysis;    Experimental research;    Thermodynamic explanation;    X-ray diffraction analyses (XRD);   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/130/1/012041/pdf
DOI  :  10.1088/1757-899X/130/1/012041

来源: IOP

【 摘 要 】

This paper presents results of research of the structure and phase transformations during the multistage crystallization of the metallic glasses with the compositions Ni71,5Cr6,8Fe2,7B11,9Si7,1and Ni63,4Cr7,4Fe4,3Mn0,8B15,6Si8,5labeled as AWS BNi-2 according to American Welding Society. Differential scanning calorimetry (DSC), X-ray diffraction analysis (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray microanalysis (EDX) were used as experimental research methods. The influence of the alloys chemical composition (boron, manganese and iron) on the temperatures and the exothermic heat effects of phase transformations, as well as on the phase composition of alloys at three stages of crystallization was analyzed. We present a thermodynamic explanation of the observed heat effects. It has been shown that manganese has the main influence on the phase transformations temperatures and heat effects in these two alloys. It is also assumed that at the final crystallization stage simultaneously with the formation of phases Ni3B and β1-Ni3Si should occur the nucleation of borides of CrB type with high Cr and low Si content.