Study on the Solidus Line in Sn-Rich Region of Sn-In Phase Diagram

Abstract

Binary phase diagrams are important tools for designing desired alloys. In the Sn-rich region of the Sn-In alloy phase diagram, the solidus line appears as a dotted line in current literature plots to indicate uncertainty. The contour of the solidus has now been clarified as a result of the present investigation. Four alloys, Sn(70)In(30), Sn(75)In(25), Sn(80)In(20), and Sn(85)In(15) were melted at 300 A degrees C for 10 h and annealed between 120 and 200 A degrees C in the (L + gamma) two-phase region. The morphology and chemical compositions of annealed specimens were analyzed using both field emission scanning electron spectroscopy and energy-dispersive x-ray spectrometry. The results reveal that the liquid phase, initially appearing at the eutectic temperature, invades the solid along grain boundaries with penetration gradually increasing with increasing annealing temperature and a granular structure form. The average compositions in grains of Sn(70)In(30), Sn(75)In(25), Sn(80)In(20), and Sn(85)In(15) specimens correspond to the solidus concentrations, and the solidus line and (beta + gamma)/gamma phase boundary can be determined as a fit to these temperature-composition points

Phase equilibria in the In–Sn-rich part of the Cu–In–Sn ternary system

“…On cooling however it was possible to detect two partially overlapping peaks. Moreover, E 1 and U 3 seem to extend at tin concentration higher than calculated, in agreement also with recent results by Yeh et al [24] about the binary In-Sn equilibria. U 2 has been inferred on the basis of the computed section.…”

Reaction evolution in Sn–20.0 wt% In–2.8 wt% Ag/Ni couples

“…In this study, they are constructed based on the phase diagrams at 160 and 240°C 5 and those of the constituent binary systems. [6][7][8][9] The results are similar to those for the Sn/Ni and Sn-In/Ni reaction couples, 6,10-12 and the Ni 3 Sn 4 phase is the reaction product. Upon thermal aging, the Ni content in this Ni 3 Sn 4 layer gradually increased from 28 to 32 at.%, whereas the In content remained unchanged around 19 at.%.…”

“…Sn-19.7 at.% In-32.1 at.% Ni, with negligible Ag, and it is the Ni 3 Sn 4 phase with 19.7 at.% In, according to the phase diagram of the Sn-In-Ni ternary system. [5][6][7][8][9] It should be mentioned that the Sn-In-Ni phase diagrams at 100 and 150°C are not available in the literature. In this study, they are constructed based on the phase diagrams at 160 and 240°C 5 and those of the constituent binary systems.…”

Grain Boundary Wetting in the Nd-Fe-B-Based Alloy

“…The fraction of completely wetted GBs increases from 0 to 100% as the temperature increases from T wmin to T wmax . [33][34][35][36][37][38][39].…”