Abstract
This research was carried out to investigate the influence of Sr–Sb on the microstructures and mechanical properties of Al–18 wt % Mg2Si–4.5Cu alloys. After the addition of 0.2 wt % Sr–Sb, the morphologies of primary Mg2Si transformed from equiaxed dendrite to cube in as-cast alloys and the average size of primary Mg2Si decreased from ~50 to ~20 μm. The shape of eutectic Mg2Si changed from Chinese script to short rod. After extrusion and T6 heat treatment, the ultimate tensile strength of modified alloy at room temperature (RT) and 100 °C increased respectively from 229 to 288 MPa, and from 231 to 272 MPa. The elongation-to-failure only slightly improved from 2.9% to 3.8% and from 3.3% to 3.7% at RT and 100 °C, respectively. The tensile fracture surface revealed a transition from brittle fracture to ductile fracture after modifying by 0.2 wt % Sr–Sb.
Highlights
The development of high strength aluminum alloys becomes significant to promote the application of aluminum alloys in transport and other fields where improved strength and light weight are essential.Recently, metal matrix composites (MMCs) have been rapidly replacing conventional materials in various engineering applications [1]
It was proved that Mg2 Si reinforced Al composites have improved mechanical properties at a wide range of temperatures [3,4] and high wear resistance [5]
The result reveals that the addition of 0.2 wt % Sr–Sb has no influence on phase compositions of the alloys, which is consistent with the previous study [17,18]
Summary
The development of high strength aluminum alloys becomes significant to promote the application of aluminum alloys in transport and other fields where improved strength and light weight are essential. Metal matrix composites (MMCs) have been rapidly replacing conventional materials in various engineering applications [1]. The intrinsic advantage of MMCs over the unreinforced alloy is the improvement of high temperature mechanical properties and wear resistance. Mg2 Si is an intermetallic compound which is frequently used to reinforce the light alloys. The Mg2 Si phase is exceptionally stable and could effectively impede grain boundary sliding at elevated temperatures [3]. It was proved that Mg2 Si reinforced Al composites have improved mechanical properties at a wide range of temperatures [3,4] and high wear resistance [5]
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