The effects of Y and Gd on the microstructure and mechanical properties of AZ81 magnesium alloy were studied by alloy preparation, microstructure analysis and mechanical property testing. The results show that moderate addition of Y and Gd to AZ61 magnesium alloy can obviously refine grains of AZ61 alloy, and decrease the amount of Mg17Al12 phase. With the increase of alloying elements, the tensile strength and elongation of aged AZ61 magnesium alloy at the temperature ranging of 25°C~175°C rise at first and then drop.When content of Y and Gd is up to 2.7%,the values of tensile strength of the alloy at room temperature and 175°C are up to their maximums, 254MPa and 164MPa respectively, while the elongation of the alloy are 22.9%,18.7% respectively. Y and Gd improve the mechanical properties of AZ61 alloy because of the grain refining strengthening, solution strengthening and the dispersion strengthening.
Magnesium alloys as the emerging commercial metal structure material have excellent specific properties and stability, which is more and more vital for researcher. This paper reviews the creep characteristics and the way to enhance the elevated temperature properties of Mg-Al based alloys. The current Mg-Al based alloys (including AZ, AM, AS, AE, etc.) are summarized. The future development direction is pointed.
Magnesium alloys as the emerging commercial metal structure material have excellent specific properties, low density, and stability, which are more and more vital for researchers. This paper reviews the behavior of rare earth in magnesium alloy and the way to enhance the elevated temperature properties of Mg-RE alloys. The current Mg-RE alloys are summarized. The future development direction is pointed.
Y and Gd are vital alloying elements to the AZ magnesium alloys. It is due to their functions mainly on solid solution strengthening and age strengthening. This paper reviews effect of Y, Gd on mechanical properties of AZ-series magnesium alloys. The future development direction is pointed.
The microstructure and mechanical properties of aged Mg-5.5Al-1.2Y magnesium alloy with Ca addition are investigated. The results show that with 1.0wt.% Ca addition, the phase of Al2Y is refined obviously and the phase of Mg17Al12 has a dramatic decrease in number. And, high melting point intermetallic compounds Al2Ca and Al4Ca are formed. Meanwhile, the β-Mg17Al12 phase become more dispersed. After 1.0wt.% Ca addition, the mechanical properties of the alloy at room and elevated temperature are improved.
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