Super-high strength of over 4000 MPa for Fe-based bulk glassy alloys in [(Fe1−xCox)0.75B0.2Si0.05]96Nb4 system

Soft-ferromagnetic bulk glassy alloys with large magnetostriction and high glass-forming ability

“…It is well known that compositions around the deep eutectic point may exhibit higher GFA in any given system. 6 The large negative mixing enthalpies between the constituent elements have also been reported to benefit GFA. 22 In the present system, the mixing enthalpies between Dy and Fe, B, or Si atomic pairs are -3, -36, and -57 kJ/mol, respectively.…”

“…[1][2][3][4][5][6][7][8] In these glassy alloys, especially for the FeBSiNb glassy alloy system, Co element is effective in improving the glass-forming ability (GFA), and the glassy alloy rod diameter was increased from 2 mm for the FeBSiNb glassy alloy system to 5 mm for the FeCoBSiNb glassy alloy system. 6,9 The reasons for improvement of GFA with the addition of Co element have been attributed to (1): the large mixing enthalpies with negative values of the atomic pairs between Co and Si or Nb; and (2) : the decrease of liquidus temperature (T l ) of the alloy system. In addition to the high GFA, the FeCoBSiNb glassy alloy system exhibits superhigh σ f of 4000 MPa, as well as good soft-magnetic properties, i.e., high saturation magnetization (I s ) of 0.84-1.13 T, high effective permeability (μ e ) exceeding 1.2×10 4 , and low saturation magnetostriction (λ s ) of (9-12)×10 -6 .…”

The observation of surface-softening in Fe-based metallic glass

“…The study of mechanical properties of bulk metallic glasses (BMGs) is an intriguing field of research from fundamental as well as application point of view [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. One of the major areas of active pursuit being carried out is how to improve the ductility of these materials, an essential factor for structural applications [2][3][4][5]7].…”

Effect of Sn addition on the glass-forming ability and mechanical properties of Ni-Nb-Zr bulk metallic glasses

“…The combination of high GFA, high thermal stability, high strength and compressive plasticity makes these alloys potentially attractive for engineering applications. Bulk metallic glasses (BMGs) have attracted much attention from scientists and engineers over the past few decades, since they possess such promising properties as high yield strength, hardness and elastic strain limit, along with relatively high fracture toughness, fatigue resistance and corrosion resistance [1][2][3]. In the case of Ni-based alloys, glassy rods up to several millimeters in diameter have been successfully fabricated from many alloy systems, such as…”

“…Bulk metallic glasses (BMGs) have attracted much attention from scientists and engineers over the past few decades, since they possess such promising properties as high yield strength, hardness and elastic strain limit, along with relatively high fracture toughness, fatigue resistance and corrosion resistance [1][2][3]. In the case of Ni-based alloys, glassy rods up to several millimeters in diameter have been successfully fabricated from many alloy systems, such as Ni-Nb-Cr-Mo-P-B [4], Ni-Zr-Ti-(Si,Sn) [5], Ni-Cu-Ti-ZrAl [6], Ni-Nb-Zr [7], Ni-Nb-Sn [8], etc.…”