Effect of modification and aging treatment on mechanical properties of Mg2Si/Al composite

Microstructure and tensile properties of cast Al–15%Mg2Si composite: Effects of phosphorous addition and heat treatment

“…It is clearly indicated that the morphology of eutectic Mg 2 Si phase changes from flake or fiber form in composite with 0.5 wt% P before heat treatment to short fibrous or fine dot-like after solution heat treatment, and eutectic network is partially broken in the same composite. Qin et al have reported similar results on Al-25Mg 2 Si-3Si-3Cu-0.5P material after solution and ageing heat treatment [9]. …”

“…8c which shows a more homogeneous distribution of eutectic Mg 2 Si intermetallic precipitates. During solution treatment, it is expected that the low melting point phases (such as eutectic Mg 2 Si phase) dissolve into aluminum matrix and transform to fine intermetallics [9]. As a consequence of the heat treatment, primary Mg 2 Si particles encountered the solution which proceeds by the diffusion of Mg and Si elements into the matrix.…”

“…It has been found that the coarsening of particles, resulting from the eutectic reaction, greatly deteriorates the mechanical properties, which is an important obstacle for the wide application of this type of composites [8][9][10][11]. It has been reported that rare earth containing materials [11,12], Cu [8], Al-Sr master alloys [13] have the power to modify the morphology of primary Mg 2 Si particles.…”

Investigation on tungsten inert gas welding of in situ Al-15 and 20 Mg2Si composites with an Al-Si filler

“…Furthermore, brittle fractures occurred in the composite. 18 Given these disadvantages, previous studies have explored the refinement of the primary Mg 2 Si phase by way of adding elements. 16,[19][20][21] The reduction of this reinforcement phase should then lead to increased strength.…”

Effects of Complex Modification by Sr–Sb on the Microstructures and Mechanical Properties of Al–18 wt % Mg2Si–4.5Cu Alloys

“…Li et al [14] suggested that 3 wt % P addition can obtain favorable refining and modifying effect in as-cast Al– x % Mg 2 Si ( x = 15, 20, 30) alloys because Mg 2 Si may nucleate on AlP surface. Qin et al [15] found that the primary Mg 2 Si changed from dendrite to polygon in the Al-25Mg 2 Si-3Si-3Cu composite when modified by 0.5 wt % P and aged, accompanied by an increase in ultimate tensile strength (UTS) from 190 to 249 MPa. Recently, N. Soltani et al [4] investigated the effect of Ti concentrations on the microstructure and tensile properties of an in-situ Al-Mg 2 Si composite; the highest UTS and elongation values were found to be 245 MPa and 9.5% for homogenized and extruded Al-15Mg 2 Si-0.5Ti composite at room temperature.…”