Processing and Mechanical Properties of Ti2AlC MAX Phase Reinforced AE44 Magnesium Composite

Xufeng Pi,Shoumei Xiong,Chaosheng Ma,Xiaojun Wang,Wenbo Yu,Antoine Guitton

doi:10.3390/ma13040995

Abstract

AE44 alloys and nanolaminated Ti2AlC particle-reinforced AE44 magnesium composites were synthesized by stir casting techniques and textured by hot extrusion methods. It was found that lamellar Al11RE3 precipitates spheroidized with the introduction of Ti2AlC into the AE44 matrix. Both transmission electron microscope and planar disregistries calculations reveal a good match for interfacial lattice transition between Mg (0001) and the basal plane (0001) of Ti2AlC. This suggests that Ti2AlC is an efficient potent nucleating substrate for Mg, thus fertilizing the formation of strong interfacial bonds. After hot extrusion treatment, Ti2AlC particles were reoriented in the textured magnesium matrix, as confirmed by X-ray diffraction. This texture effect on the composite’s mechanical properties was carefully studied by tensile and compressive tests.

Highlights

To meet the requirements of reducing the weight of transport tools, especially in automobiles, the lightest structures of magnesium metal are sought as attractive candidates [1,2]
Once Ti2 AlC particles were introduced into AE44 alloy as shown in Figure 1b, the lamellar eutectic phases transformed into round particles
Ti2 AlC particles were relatively uniformly distributed throughout the Mg matrix with some agglomeration

Summary

Introduction

To meet the requirements of reducing the weight of transport tools, especially in automobiles, the lightest structures of magnesium metal are sought as attractive candidates [1,2]. The stiffness and wear resistance of magnesium alloys are still relatively low, and the application of Mg alloys into automobile cylinders is still restricted due to requirements of high stiffness, wear resistance, and lubrication capacity at elevated temperatures. To overcome these restrictions, regarding simultaneously enhancing the stiffness and superior wear resistance of Mg alloys, the onlyffective method is to fabricate magnesium composites by introducing ceramic particles into Mg alloys [6,7,8]. High-damping and layered graphite may improve the damping and self-lubricating

Methods

Results

Conclusion