Mechanical Properties and Crystallization Behaviors of Microstructured Co-Fe-P Amorphous Alloys

Abstract

Microstructure with microsized amorphous grains is found in thick-film Co-Fe-P amorphous alloys prepared by electrodeposition. The amorphous alloys exhibit different structure, mechanical properties, and crystallization behaviors compared with those of homogeneous amorphous alloys, e.g., bulk metallic glasses. The mechanical properties of these microstructured amorphous alloys are characterized by tensile tests, dynamic mechanical analysis, and micro-and nanoindentations. Using a differential scanning calorimeter, the activation energy of the crystallization process of the microstructured amorphous alloy is measured and is found to depend on its microstructure.

The effects of glass–glass interfaces on thermodynamic and mechanical properties of Co–Fe–P metallic nano-glasses

“…Figure 8d shows the SRS factors and for Co-Fe-P samples with different D. As it can be seen, larger STZ volume can be initiated in Co-Fe-P samples with smaller D. For 75 nm-NGs, the STZ volume can be as high as 7.81 nm 3 , as compared to 4.40 nm 3 and 3.64 nm 3 for 300 nmand 400 nm-NGs. At the same time, the STZ volume for 50 µm -MGs is as low as 2.86 nm 3 . By assuming a spherical STZ, its radius would be around 1.23 nm in 75 nm-NGs, which is close to the width of GGI regions.…”

“…Metallic glasses (MGs) are classified as one of the disordered alloys and have attracted much attention over decades. Due to the disordered atomic structure, their mechanical properties, such as high yield strength [1,2] and large elastic limit [3], can be easily reproduced. Up to now, numerous kinds of MGs are available and most of them are synthesized through rapid quenching from their molten state.…”

“…are thereafter formed, in which the Co and Fe atoms are most likely to deposit; then, Co 2+ and Fe 2+ cations agglomerate at different sites of P clusters, forming the primitive nano-sized Co-Fe-P glassy clusters[3]. Compared with DC electrodeposition, the pulse electrodeposition can efficiently suppress the growth of nano-sized glassy clusters.…”

Molecular dynamics simulation on the mechanical properties of Zr-Cu metallic nanoglasses with heterogeneous chemical compositions

“…To date, inert gas condensation (Averback et al, 1990;Chen et al, 2015;Nandam et al, 2021), magnetron sputtering (Wang et al, 2014;Ketov et al, 2015;Sniadecki et al, 2016;Mohri et al, 2017;Nandam et al, 2017), severe plastic deformation (Wang et al, 2011;Shao et al, 2013) and pulse electrodeposition (Shen et al, 2011;Guo et al, 2017;Li et al, 2021b) have been developed to fabricate NGs. Despite of the manufacturing routes, the preparation of NGs in large dimensions is still challenging and, as a result, there are only a very few studies (Hu et al, 2017;Sharma et al, 2021) that determine the mechanical properties of NGs through mechanical tests, largely attributing to the fabrication barrier of current techniques.…”

Mechanical property dependence on compositional heterogeneity in Co-P metallic nanoglasses

“…The previous simulation studies mainly focus on Cu-Zr NGs 31,44 and are yet not available for many other NG systems. In our previous work 15,25,27,[46][47][48] , it was demonstrated by us that the pulse electrodeposition is a feasible synthesis route in preparing (Co, P)-based NGs, which could be further investigated by the MD simulation 49 . In this work, the mechanical property dependence on compositional heterogeneity in Co-P NGs prepared through pulse electrodeposition has been investigated.…”