Crystallization behaviour of amorphous Fe-Sm alloys

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Abstract

The crystallization behaviour of amorphous Fe100−xSmx (17 ⩽ x ⩽ 72.5) alloys has been studied by magnetic, differential thermal analysis (DTA) and X-ray diffraction techniques. It has been found that two metastable intermetallic compounds, Fe5Sm and PII (an unidentified phase), form during crystallization. There are three composition ranges differing in the crystallization process in the Fe-Sm alloy system; first composition range, (x ⩽ 17) Am → Am + α-Fe → Am + α-Fe + Fe5Sm → α-Fe + Fe5Sm + Fe2Sm, second (17 < x ⩽ 33.3), Am → Am + α-Fe → Fe2Sm + PII and third (33.3 < x ⩽ 72.5), Am → Am + Sm → Fe2Sm + Sm. A metastable phase diagram describing the phase transformation on heating has been established, showing that the thermal stability of these alloys is highest around x=33.3.

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