Cerium Effect on the Phase Composition and Crystallization Behavior of Aluminum Casting Alloys Based on the Al–Mg–Si System

Aluminum Cast Alloys Based on the Al–Ce–Si–Mg System: An Influence of Silicon on Crystallization, Phase Composition, and Tensile Properties

“…Using a Thermo-Calc software package (TCAl4.0 database), unexplored data concerning the phase composition and crystallization behavior of Al-Mg-Si-Ce alloys have been obtained in the range of two-phase cast Al-Mg alloys such as (Al) + Mg 2 Si. [16] In another study the CALPHAD method was used to explore an alloy within the quinary Al-Ce-Cu-Mg-Si system by developing a thermodynamic database with self-consistent parameters. [17] However, there is no systematic experimental assessment of the Al-Ce-Si system and the common literature approach is where Al-Si alloys are modified by small additions of Ce, typically below 1 wt.…”

“…pct) alloy, slightly reduced the liquidus temperature to 636 °C and substantially lowered the non-equilibrium solidus temperature by about 30 °C to 421 °C. [16] A reduction in the eutectic temperature is seen as a factor negatively affecting the thermal stability of the Al5Ce3Si0.5Mg alloy. Observed at the same time, an almost ten-fold widening of the melting range from 10 °C to 91 °C may affect the alloy casting behavior and its susceptibility to solidification cracking.…”

“…pct at 555 °C. [21] An excess of magnesium, which cannot be dissolved in the matrix, is available for the formation of intermetallic compounds. A potentially positive influence of Ce on Al matrix strengthening was revealed while studying the phase composition of Al-Ce-Si-Mg system after annealing at 400 and 550 °C.…”

“…A potentially positive influence of Ce on Al matrix strengthening was revealed while studying the phase composition of Al-Ce-Si-Mg system after annealing at 400 and 550 °C. [16] It is argued that the (Al) solid solution became supersaturated as a result of the Al 8 Mg 5 phase dissolution, where each 0.1 pct Ce increased the Mg content in the (Al) solid solution by 0.005 pct in the first case (400 °C) and by 0.01 pct in the second one (550 °C). According to EDX measurement, 1.15 wt.…”

“…It is reported that small additions of Si lead to the tetragonal intermetallic Ce(Si 1-x Al x ) 2 , with x = 0.1-0.9, which extends across the central portion of the phase diagram. [11] According to, [21] the low solubility of Ce in Al and Si along with the tight bonding of vacancies to Ce and the formation enthalpy of the s 1 phase, which reaches a minimum of 67 kJ/mol near x = 0.5, all contribute to the stability of this phase.…”