Thermodynamic and Experimental Study of the Mg-Sn-Ag-In Quaternary System

Abstract

Phase equilibria in the Mg-rich region of the Mg-Sn-Ag ternary system were determined by quenching experiments, differential scanning calorimetry, electron probe micro-analysis, and Xray diffraction techniques. No ternary compounds were found in the studied isothermal sections. A critical evaluation of the available experimental data and a thermodynamic optimization of the Mg-Sn-Ag-In quaternary system were carried out using the calculation of phase diagrams method. The modified quasichemical model in the pair approximation was used for the liquid solution, which exhibits a high degree of short-range order. The solid phases were modeled with the compound energy formalism. All available and reliable experimental data were reproduced within experimental error limits. A self-consistent thermodynamic database was constructed for the Mg-Sn-Ag-In quaternary system, which can be used as a guide for Mg-based alloys development.

Thermodynamic description of the Ag–(Ca, Li, Zn) and Ca–(In, Li) binary systems

“…A self-consistent thermodynamic database of the Mg-X (X: Ag, Ca, In, Li, Na, Sn, Sr, and Zn) multi-component system has been constructed with the previous and present work by our group [22][23][24][25][26]. This thermodynamic database shall facilitate the development of Mg alloys for practical industrial purposes.…”

“…In order to resolve this, the heat capacity functions of solid In, and Li were modified above their melting temperatures (that is, in their metastable regions) to make sure that the heat capacity curves of intermetallics phases involving Li and In with temperature increase up to their own melting temperatures. The details of extrapolated function for Cp of low melting temperature elements of Li and In above their melting temperature were given in the previous work [22][23][24][25][26], and the same modified parameters also were used only in the NeumanKopp estimations of the Cp of Li-and In-containing intermetallic phases in the present work. A list of all phases appearing in the Ag-(Ca, Li, Sr, and Zn) and Ca-(In, Li) binary systems considered in the present study is given in Table 1.…”

“…This is a part of the wide thermodynamic database development project of our group for the Mg-Sn-(Ag, Ca, In, Li, Na, Sr, and Zn) multi-component system [22][23][24][25][26].…”

Formation of intermetallic compounds in Mg–Ag–Al joints during diffusion bonding

“…A smaller value indicates that it is easier to form the phase. The DH f 0 values of the three IMCs form this order: DH f 0 (MgAg)(-16.9 kJ mol -1 ) \ DH f 0 (Mg 3 Ag) (-13.8 kJ mol -1 ) \ DH f 0 (Ag 2 Al) (-8.7 kJ mol -1 ) [24,25]. This order demonstrates that the formation of Mg-Ag compounds has a greater thermodynamics driving force than the formation of Ag-Al compound, which is consistent with the observed interfacial microstructure evolution of the joints in Fig.…”

Critical evaluation and thermodynamic optimization of the (U + Bi), (U + Si) and (U + Sn) binary systems

“…The thermodynamic properties of the liquid phase were modelled using the Modified Quasichemical Model in the Pair Approximation (MQMPA) developed by Pelton et al [56,57], which has been applied successfully in previous works [58][59][60][61][62]. A detailed description of the MQMPA and its associated notation are given in references [56,57].…”