The effect of Ni addition on thermal properties ofFeNiMoPCB Bulk Glassy Alloy (BGA)

Metallic Glasses have recently gained a lot of attention due to their appropriate mechanical and corrosionproperties. Adding a secondary phase in these alloys can result in the fabrication of in-situ or ex-situmetallic glass matrix composites which in turn improves the mechanical properties. Among these glassyalloys, Fe-based alloys have gained the focus of many studies in recent years. In the present study, the(Fe۱-xNix)۷۷Mo۵P۹C۷.۵B۱.۵ (x = ۰.۰۵, ۰.۱) glassy alloy is fabricated by the induction melting technique inan alumina tube, and the subsequent injection casting in a water circumference copper mold. The X-raydiffraction and differential scanning calorimetry analyses for alloys with ۲ mm diameter showed thatthe x = ۰.۰۵ sample contains in-situ Fe۲NiP nanocrystalline phase embedded in the amorphous matrixwhich is formed during cooling from the melt, while the x = ۰.۱ sample contains a fully amorphousmicrostructure. Increasing the amount of Ni led to a fully amorphous configuration in samples with x =۰.۱ having diameters of ۱ and ۲ mm. Using the X-ray diffraction pattern, the size and volume fractionof Fe۲NiP nanocrystals formed in the in-situ amorphous/crystalline nanocomposite with the compositionof (Fe۰.۹۵Ni۰.۰۵)۷۷Mo۵P۹C۷.۵B۱.۵ are estimated to be around ۲۲ nm and ۱۸%, respectively.

Keywords:

Metallic Glasses , nanocomposite , in-situ method , Glass Forming Ability