Aging kinetics of 14H-LPSO precipitates in Mg-Zn-Y alloy

Abstract

M agnesium alloys have advantages of low density, high specific strength and specific stiffness, good damping, castability, machinability and easy recovery, and are regarded as engineering materials with the greatest potential after aluminum alloys. However, the lower hardness, modulus of elasticity, wear resistance, and high coefficient of thermal expansion of magnesium alloys limit their further application [1-4]. Mg-Zn-Re alloy has attracted more and more attention due to its special structural phase (long-period stacking ordered structures phase, LPSO) and good mechanical properties. A study found that when the volume fraction of LPSO phase in the magnesium matrix reaches 85%-90%, the yield strength of extruded Mg89Zn4Y7 alloy can reach 480 MPa [5]. Onorbe E. [6] prepared Mg100-3xY2xZnx alloys (where x = 0.5, 1 and 1.5at.%) with different LPSO phase contents by the in-situ method, and studied the effects of LPSO phase content on the microstructure and mechanical properties. The results indicate that with the increase of LPSO phase, the room temperature yield strength improved noticeably. LPSO can effectively

Improving corrosion resistance of high strength Mg-Zn-Y alloy through Ca addition

“…Mg-Zn-Y alloy with an LPSO structure (LPSO) has received considerable attention, highlighting mechanical properties due to its unique microstructure [24]. It has been found that the LPSO phase can significantly increase the creep and corrosion resistance of magnesium alloys, apart from their strength and ductility [25][26][27][28][29][30]. Alok et al [31] found that when Mg-Zn-Y alloy with a long-period ordered stacking structure was treated to obtain fine grains below 2 μm, the mechanical properties of the alloy improved considerably.…”

Improved Corrosion Resistance in AZ61 Magnesium Alloys Induced by Impurity Reduction

“…Liu et al [16,33] and Inoue et al [23] reported that the corrosion rate of magnesium alloy was substantially high due to its contamination with Fe above the tolerance limit. It has been reported that if the iron content of the magnesium alloy is less than 20 ppm, the corrosion resistance of magnesium alloys may be lower than the corrosion resistance of aluminum alloys [34]. Liu et al [16,33] theoretically explained the corrosion tolerance limit of 170 ppm for Fe through the Mg-Fe phase diagram, and the corrosion tolerance limit of Fe can be significantly reduced to about 5-10 ppm after heat treatment [21,33,35].…”

Microstructure evolution and mechanical properties of Mg-12Zn-2Y alloy containing quasicrystal phase fabricated by different casting processes

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Magnesium alloy has the characteristics of low density, high specific strength and large elastic modulus, and is widely used in electronic communication, transportation, aerospace, and other fields [1][2][3] . However, compared with other cast alloys, thermomechanical properties and heat resistance of conventional cast magnesium alloy are lower, which limit the industrial application of magnesium alloy [4,5] . Some researchers have studied the effect of the quasicrystal phase on the mechanical

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