Study of glass forming tendency of Ca–Mg binary alloy and its physical properties: Pseudomolecule formation model

Synthesis of copper-based bulk metallic glasses in the ternary Cu–Mg–Ca system

“…This system is found to comply with well-known empirical guidelines, [2] in that it displays a large difference in atomic radius between each constituent element of at least 20% (Cu-128 pm, Mg-160 pm and Ca-197 pm), all of which display negative heats of mixing with one another [14,15] and exhibit simple and consistent electron configurations. In addition, amorphous alloy formation has been found over wide composition ranges in binary Mg-Cu [16], Ca-Mg and Ca-Cu [17] alloys and in works by Amiya et al [18] and Senkov et al [19] who confirmed high GFA near a deep Ca-rich ternary eutectic reaction in the Cu-Mg-Ca system, with the Ca 50 Mg 22.5 Cu 27.5 alloy exhibiting a critical casting diameter of 10 mm [19].…”

Prediction of Glass-Forming Compositions in Metallic Systems: Copper-Based Bulk Metallic Glasses in the Cu-Mg-Ca System

“…To investigate this notion and to determine the effectiveness of this glass-forming alloy design principle, the Cu-Mg-Ca ternary system was chosen for detailed analysis, since this system complies with the well-known empirical guidelines [21] in that all three elements have negative heats of mixing with each another [22,23] and there is an exceptionally large difference in atomic radius of at least 20 pct (Cu-128 pm, Mg-160 pm, and Ca-196 pm), which geometrically allows for a larger compositional range of efficiently packed ternary clusters. Further, the relatively large atomic radii of the alloy constituents is believed to further enhance GFA, since nucleation and growth of competing crystalline phases in metallic alloy systems is known to decrease with increasing atomic radius.…”

Electronic Transport and Thermodynamic Properties of Binary Liquid Alloy: Ab Initio Approach

“…Hence, a liquid metal binary alloy becomes a ternary system, consisting of free constituent ions of the component metals and chemical complex. A complex formation model [30][31][32][33][34][35][36] assumes the liquid binary alloy A À B as a ternary mixture consisting of free atoms A, free atoms B, and their preferential association-referred to as chemical complex A l B m .…”

“…[30] The value of g has been taken nearly equal to À(l + m)G M as a starting point, and then the interaction energies W 12 , W 13 , and W 23 have been adjusted to get the concentration dependent free energy of mixing G M through Eqs. [34] and [35]. The process has been repeated for different sets of energy parameters until a good fit for G M was obtained.…”