Thermal stability and magnetic properties of partially Co-substituted (Fe71.2B24Y4.8)96Nb4 bulk metallic glasses

Abstract

The influence of partial replacement of Fe with Co in the quaternary (Fe 71.2 B 24 Y 4.8 ) 96 Nb 4 bulk metallic glasses on their structure, thermal stability and magnetic properties was studied. It was found that Co increases the thermal stability, as well as the Curie temperature, which monotonously increases as the Co content increases. The saturation magnetization shows a maximum of 1.01 μ B per magnetic atom for x = 0.1, followed by a perfectly linear decrease for higher Co contents. The extension of the supercooled liquid region may reach even 98 K and the glass transition temperatures approach the theoretical value of 2/3 of the melting temperature. Using the mean filed theory for amorphous alloys allows to calculate the exchange stiffness constant and to correlate its variation with the variation of the magnetic saturation.

Low expansion in [(Fe0.9Co0.1)0.72B0.24Nb0.04]95.5Y4.5 bulk metallic glass

“…In recent years, Fe-rich bulk metallic glasses (BMGs) were discovered as a new class of multicomponent alloys with high glass forming ability and excellent engineering properties [12][13][14][15][16][17][18][19], which are helpful to study the structure disorder effect on thermal expansion. While little work has been done on the thermal expansion of Fe-based amorphous alloys [20][21][22].…”

Effects of sintering temperature on microstructure and property evolution of Fe81Cu2Nb3Si14 soft magnetic materials fabricated from amorphous melt-spun ribbons by spark plasma sintering technique

“…Fe-based amorphous soft magnetic materials have been widely used in many industries such as electronics, information and transportation [1,2]. The soft magnetic properties can be further improved by the partial crystallization of Fe-based amorphous precursors to create a homogeneous distribution of BCC α-Fe nanocrystals within a residual amorphous matrix [3,4].…”

Preparation of Fe₇₆Si₉B₁₀P₅ Nanocrystalline Magnetic Cores by Direct-Nanocrystallizing Method during Spark-Plasma Sintering

“…Fe-based BMGs with good magnetic properties, high strength and low materials cost should have great potential for wide variety of applications [1,2,3] . However, the Fe-based amorphous samples produced by rapid quenching from the melt are still small in size due to the requirement of high critical cooling rate, which thus limits their engineering applications.…”