Hardness, magnetism and passivation of Fe-Si-B-Nb glasses

Newly-developed pseudo-high entropy amorphous alloys: Structure/microstructure evolution, mechanical and corrosion properties.

“…However, unlike the designed FeCrMoNbB PHE amorphous alloy, Cr amounts above 6% were found to have the opposite effect in those conventional Fe-based amorphous alloys. As stated before, Nb can improve glass forming ability [9,45], and Zhai et al [65], as in the present work, have shown a positive effect in the GFA by replacing Fe with Nb up to 4 at.% in a Fe-Cr-Mo-C-B-Nb composition.…”

“…The addition of B can increase the GFA but may embrittle the alloy [44]. As stated in [9,45], Nb can improve glass forming ability, corrosion resistance, and magnetic and mechanical properties. However, the alloys of these works also presented pitting corrosion.…”

“…Since the '60s, stimulating and well-known new categories of metallic materials have been discovered, for instance, glassy [3] and, more recently, multi-principal element alloys (MPEAs) [4]. Fe-based amorphous metallic materials are expected to have interesting properties such as strength, hardness, and magnetic, as well as resistance to wear and corrosion [5][6][7][8][9]. Despite the remarkable properties' assortment, surpassing those encountered in traditional Fe-based alloys, bulk metallic glasses (BMGs) and even MPEAs are usually related to high costs due to the amounts of substantially expensive elemental constituents.…”

Thermogravimetric and temperature-dependent electrical investigations of Pr3+ doped multi-component silicate glasses for microelectronic technology

“…Though the Nyquist spectra predict diffusional effects in the higher frequency domain, it could be inferred from the phase diagram by Bode's rule that the glasses still exhibit a capacitive nature in the aforementioned frequency region. However, due to the non-Debye pattern of relaxation and the inception of CPE in the circuit, highlighting the effects of diffusion, the capacitance of the glasses is expected to reduce by a smaller extent, particularly towards higher frequencies [82]. It could also be observed that the phase angle slightly increases with the dopant concentration, indicating the role of Pr 3+ ions in enhancing the storage capacity.…”

Corrosion comparison of free and roller surfaces of Fe70Si8B12Nb10 amorphous ribbon

“…Composition control is the most effective way to increase the corrosion resistance of amorphous alloy, and this can be accomplished by adding Nb and Ta to Fe–Cr–Mo–C–B amorphous alloy, 18 adding Zn to Mg–Cu–Y amorphous alloy, 19 adding Cr to Fe–Si–B amorphous alloy, 20 or adding Nb to Fe–B alloy 21 and Fe–Si–B amorphous alloy. 22 All these methods effectively increase the corrosion resistance and the glass-forming ability (GFA) of the amorphous alloy. The differences between the free surface (FS) and the roller surface (RS) of the amorphous ribbon have rarely been studied because the composition distribution of the amorphous alloy is more uniform than that of the crystalline alloy, and there is generally no second phase or other precipitates.…”