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

Abstract

The effect of Dy addition on the glass-forming ability (GFA), magnetostriction as well as soft-magnetic properties and fracture strength in FeDyBSiNb glassy alloys was investigated. In addition to the increase of supercooled liquid region from 55 to 100 K, the addition of Dy is effective in approaching alloy to an eutectic point and increasing the saturation magnetostrction (λs). Accordingly, bulk glassy alloy (BGA) rods with diameters up to 4 mm were produced, which exhibit a large λs as high as 65×10-6. Besides, the BGA system exhibits superhigh fracture strength of 4000 MPa, combined with good soft-magnetic properties

Crystallization behaviors of FeSiBPMo bulk metallic glasses

“…[1,2]. Among these BMGs, Fe-based ferromagnetic BMGs are more attractive not only because of their excellent soft magnetic properties, high strength and high corrosion resistance, but also their abundant natural resources and low material cost, so a variety of Fe-based ferromagnetic BMGs have been developed [3][4][5][6][7][8][9][10][11][12][13][14][15]. However, it is difficult to develop Fe-based ferromagnetic BMGs combined with large glass-forming ability (GFA) and high saturation magnetization (I s ).…”

“…However, it is difficult to develop Fe-based ferromagnetic BMGs combined with large glass-forming ability (GFA) and high saturation magnetization (I s ). In order to enhance the GFA, the Fe-based ferromagnetic BMGs usually contain special glass-forming elements (such as Nb, Cr, Zr, W, Ti, Tb, Dy, and Er) having large atomic size and negative mixing enthalpies with the constituent elements [3,4,[6][7][8][9][10][11][12]14,15], which leads to the decrease of the I s . In 2007, an Fe-based ferromagnetic alloy system simultaneously exhibiting large GFA and high I s was synthesized by Makino et al [16], and the GFA was further improved by adding Mo element [17].…”

Materials Degradation and Detection (MD2): Deep Dive Final Report

“…Next-generation, rad-hard magnetostrictive materials will likely come from the class of materials that is very tolerant of disorder, or is already disordered itself. For example, bulk metallic glasses (BMG) such as FeDyBSiNb (Li 2011) as well as commercial "Metglas" FeSi-B based amorphous metals have been shown to have reasonable magnetostriction coefficients. Usually these materials are used for mechanical applications or as soft magnets, and optimization for magnetostriction and radiation damage is possible.…”

Mechanical properties of structural amorphous steels: Intrinsic correlations, conflicts, and optimizing strategies

“…However, just like the case in other high-strength materials, the amorphous steels usually exhibit disappointingly limited ductility and toughness, which are widely recognized as the main obstacles for their structural use. 1,[21][22][23][24][25][26][27][28][29][30][31][32][33][34][40][41][42] On the other hand, the strength and hardness may be the critical focuses for some applications such as the coatings and cutting tools. [36][37][38] Thus, it is significant to develop systematic strategies for strengthening and ductilizing/toughening the amorphous steels to promote their structural applications.…”

“…Moreover, the mechanical properties of the amorphous steels can be affected by multifarious factors, e.g., their thermal and elastic properties as well as the atomic bonding characters, which depend primarily on the alloy compositions. [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][44][45][46][47] Yet, the compositions may vary continuously in wide ranges and among different alloy systems. So far, despite the extensive efforts to explore high-performance structural amorphous steels, the interdependences between the mechanical properties and other factors have not been thoroughly examined, and the underlying mechanisms are not fully understood.…”