Study of Crystallization Process of Fe78Tm2B20 and Fe76Tm4B20 Alloys
نویسنده
چکیده
The amorphous to crystalline transformation in Fe78Tm2B20 (Sample S1) and Fe76Tm4B20 (Sample S2) alloys has been carried out using Differential Scanning Calorimetry (DSC). Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) of the samples are also discussed to confirm the complete crystallization after heating. DSC analysis of the samples S1 and S2 showed that on heating the samples upto 1000 0 C, a sharp peak was observed at 545 0 C and 791 0 C respectively, indicating a primary crystalline phase appearing in the amorphous matrix. In sample S2 another sharp peak was observed at 896 0 C, indicating further crystallization in the sample. Both the samples are completely crystallized when temperature is above 929 0 C. In sample S2, the crystallization is a multi stage process where different crystalline phases grow in the amorphous matrix. SEM patterns of these samples showed that as cast samples are amorphous and the sample are completely crystallized when heated to 1000 0 C. EDS patterns also confirmed the complete crystallization of the samples after heating to 1000 0 C. Thus increase of Tm concentration in Fe-Tm-B alloy changes the process of crystallization.
منابع مشابه
Effect of Ni on Amorphization of Ti-Cu-Ni Ternary alloys Prepared by Mechanical alloying
Amorphous alloys has been taken into consideration because of their unique properties and are nominated as the future engineering materials. In this research, the effect of Ni and milling time on amorphization process and thermal stability of Ti50Cu50-xNix(x=10, 15, 25 at%) alloy system were investigated. The evolution of amorphization during milling, thermal stability and subsequent heat treat...
متن کاملStudy of Crystallization Process in V-substituted Finemet Alloys
Nanocrystalline soft magnetic alloys can be produced by partial crystallization of amorphous precursor. The aim of this paper was to study the influence of Nb substitution by vanadium (V) in Fe73.5Cu1Nb3-xVxB9Si13.5 (x=1.5, 3) alloys on their crystallization process and the glass forming ability because the growth of the α-Fe(Si) crystals is reduced by (Nb) diffusion barrier. Amorphous ribbons ...
متن کاملA DETAILED STUDY TOWARD THE NANO -CRYSTALLIZATION OF α – Fe IN Fe55-X Cr18Mo7B16C4 BULK AMORPHOUS ALLOY
Crystallization of α – Fe phase during annealing process of Fe55Cr18Mo7B16C4 bulk amorphous alloy has been evaluated by X- ray diffraction, differential scanning calorimetric tests and TEM observations in this research. In effect, crystallization mechanism and activation energy of crystallization were evaluated using DSC tests in four different heating rates (10, 20, 30, 40 K/min). A two -st...
متن کاملFree-surface dynamics in the Ribbon Growth on Substrate (RGS) process
The cost efficient, high throughput production of metaland semiconductor alloys is the foundation of many advanced technologies. With the development of the Ribbon Growth on Substrate (RGS) technology, a new crystallization technique is available that allows the controlled, high crystallization rate production of silicon wafers and advanced metal-silicide alloys. Compared to other crystallizati...
متن کاملUsing minerals chemistry of plagioclase for the study of magma crystallization process in Ravanj intrusive (NE Delijan)
The Ravanj intrusive, with tonalite, quartz-diorite, and microquartz-diorite composition, is exposed in the West of Ravang Village, NE Delijan, in Urmia-Dokhtar zone. Plagioclase is observed in three different sizes (coarse, intermediate, and microcrystalline) in the composition of in Ravanj intrusive. Most of the coarse crystals are zoned while intermediate and microcrystalline show polysynthe...
متن کامل