Preparation Of Fe-Zr-B Amorphous Alloys By Mechanical Alloying And Thermodynamic Calculation Of Fe-Zr-B Phase Diagram

Fe-Zr-B amorphous alloy is an important soft-magnetic material, which has important applications in preparation of transformer, magnetic recorder, electromagnetism disturbing shield and so on. But because of the ignorance of the amorphization mechanism and the high cooling rate which the traditional preparation method of amorphous alloy required, the manufacture and application of such material have been restricted.In our research work, we studied the Fe-Zr-B amorphous alloy from experimental studying and theoretical studying synchronously. There were two focuses such as:(1) What is the amorphization mechanism and the relationship between the amorphous alloy forming ability and the component of the Fe-Zr-B system;(2) Which component has great ability to form amorphous alloy.And we tried hard to find a new way to realize the designing of amorphous alloy by CALPHAD technology.In experimental research, we have prepared the Fe₆₀Zr_xB_40-x (x = 0,10, 20, 30, 40 at.%) by mechanical alloying. And the amorphization processing and thermodynamic behavior has been studied by SEM., XRD and DSC. The amorphization mechanism and the thermal stability were discussed. In theoretical research, we have collected the thermodynamic data about Fe-Zr, Fe-B and B-Zr system. On the basic of it, we have predicted the Fe-Zr-B ternary phase diagram and calculated its liquid line, then we acquired the eutectic components. According to some researching conclusions, the eutectic components must be the components which have great glass forming ability.By the contrast and analysis between the calculated result and our experimental conclusions, we find that the component which has great glass forming ability and higher thermal stability in our mechanical alloying research is similar to one of the calculated eutectic component. And by the analysis with former researching work, we conclude that the component near to our calculated result will have good glass forming ability. The research conclusion indicated that the assumption of designing amorphous alloy by CALPHAD technology which we have put forward is correct and feasible.