heat treatment of magnesium alloy and rare earth magnets
With modern rapid development of industry and traffic, vibration and noise hazards increasingly significant, in order to achieve the purpose of reducing vibration and noise, vibration source of the vibration control is particularly important. In this paper, research and development of high strength and high damping magnesium alloys for the purpose of pure magnesium and Mg-Al-Zn magnesium alloy studied by optical microscopy, scanning electron microscopy and transmission electron microscopy to observe the microstructure characteristics; by tension test testing the mechanical properties; by dynamic mechanical thermal analysis of damping capacity with strain amplitude and temperature trends. To reveal the deformation process, heat treatment, and rare earth Y on the microstructure and properties of magnesium alloys were studied for the development of high strength and high damping magnesium alloy to provide useful reference materials.
Firstly, starting from pure magnesium to study the deformation of the damping properties of pure magnesium and found that bending the body in the pure magnesium matrix into a lot of tangles of dislocation, adverse effects on the damping properties. However, after bending deformation of the pure magnesium sample after annealing a large number of dislocation tangles disappear, be straight and uniform distribution of dislocations, therefore greatly enhance the damping properties, some of the damping properties of the sample even more than dealing with the pure undeformed magnesium.
On this basis, research and non-uniform homogenization of the Mg-Al-Zn alloy extrusion in a state, the second extruded, forged state of the mechanical properties and damping properties. The results showed that: the alloy after deformation process of three different variables shaping the form of little difference between the mechanical properties, but the damping properties of significant changes have taken place. State which forged forged magnesium alloy grain size as large, and the disappearance of a large number of dislocation tangles in the strain amplitude was 5 × 10 ~ (-3), its damping performance relative to the second extruded increased 5 times .
Next, change the shape of the magnesium alloy after heat treatment the mechanical properties and damping properties. Found varying patterns Mg-Al-Zn alloy after heat treatment, T5 and T6 state significantly improved the strength of state, and T6 state still maintained a certain degree of plasticity, while T4 and T6 states and strain states of the relevant parts of the damping has also been a large rate increase. Heat Treatment on Mg-Al-Zn alloy damping properties were studied by the GL theory has been well explained.
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Finally, the study of rare earth Y on Mg-Al-Zn alloy microstructure, mechanical properties and damping properties. Found that the addition of Y significantly larger grains of alloy, and precipitation of new phase Al2Y, but the alloy yield strength has not been reduced due to the increase of grain, but the precipitation of the new phase Al2Y improved significantly. Damping properties of the alloy at room temperature with the addition of rare earth Y has been significantly improved, the damping value increased by 69% or more. Damping properties of the alloy's high temperature tests, the emergence of a new phase Al2Y makes Mg-Al-Zn alloy enhanced the anti-softening properties, until after 300 ℃, Al2Y phase began to soften.
