New Strategy to Improve the Mechanical Properties in Cast Al–Mg–Fe Alloys by the Formation of Al–AlFe Eutectic

Abstract

Fe-containing intermetallics are often detrimental to the mechanical properties in aluminum alloy. However, an Al-Fe alloy system can form an Al þ AlFe eutectic structure in a narrow freezing range, providing the fine Al 13 Fe 4 or Al 6 Fe intermetallics. Herein, the ternary Al-Mg-Fe alloy is selected to achieve the Al þ AlFe eutectic structure composition and form fine AlFe intermetallics for improving the strength and ductility of Al-Mg cast alloy. The results show that as the composition of Al-Mg-Fe alloy is closer to the Al þ AlFe eutectic composition, the amount of coarse Al 13 Fe 4 intermetallics decreases, whereas the amount of fine Al þ Al 13 Fe 4 eutectic increases. The microstructural evolution results in the improvement of yield strength (72.8-92.4 MPa), tensile strength (126.1-213.7 MPa), and the elongation (2.5-6.2%). This work provides a new strategy to improve the mechanical properties in Al-Mg cast alloy.

Microstructural Evolution and Mechanical Properties of Al-Si-Mg-Cu Cast Alloys with Different Cu Contents

“…Then, pure Cu and Mg were added into the melt at 750 • C and held for 20 min, followed by slag removal. The Al-10%Sr alloy was added into alloy melts at 730 • C. The alloy melt was ultimately poured into a water-cooled copper mold (25 × 100 × 200 mm 3 , Figure 1) to form an as-cast ingot [14][15][16].…”

“…The Al-10%Sr alloy was added into alloy melts at 730 °C. The alloy melt was ultimately poured into a water-cooled copper mold (25 × 100 × 200 mm 3 , Figure 1) to form an as-cast ingot [14][15][16].…”

Analysis of Metal Systems for Developing Creep-Resistant Aluminum Alloys. A Review.

“…The tensile strength of this alloy was 175MPa. The data of [28] show that the strength of the cast alloy of the Al-Mg-Fe system, which crystallized under conditions of rapid cooling of the melt, had strength values at the level of 120-213MPa and ductility δ ~ 2-6.2 %.…”

“…The eutectic of Al-Al 6 Fе has a very favorable structure and mainly submicron allocations of the Al 6 Fе phase of round or fibrous morphology [26][27][28][29]. Such characteristics allow us to consider Al-Fe alloys as high-potential heat-resistant materials and Al 6 Fе phase as an effective strengthening component of aluminum alloys.…”

Connecting Solidified Microstructure with Compression Properties for Bulk Ti–Al Alloys with V Addition Conducted by Electromagnetic Levitation and First Principle

“…Intermetallic compounds have driven the development of highperformance materials due to their excellent mechanical properties, which have contributed to the design of advanced alloy. [1][2][3] Ti-Al-based alloys as lightweight materials have been considered as potential candidates for the aerospace industry due to their high-temperature mechanical properties such as high specific yield strength and creep resistance. [4,5] However, the inherent brittleness of TiAl intermetallics at room temperature is the main challenge for the process and application of Ti-Al-based alloys.…”