Study On The Uniaxial Tensile Mechanical Behaviour Of GWZK134 Rare Earth Alloy By Electric Pulse Solid Solution Treatment

Rare earth magnesium alloys have high strength,high temperature stability,corrosion resistance,high temperature creep resistance and other capabilities,solving the constraints of the traditional magnesium alloy materials are widely used in the automotive manufacturing industry,national defense and military,high precision electronics and other areas of application of key issues such as poor mechanical properties at high temperatures and poor corrosion resistance.The material properties of rare earth magnesium alloys have been improved after plastic deformation,however,its plastic deformation intermediate solid solution treatment process generally takes a long time,there is an urgent need for an efficient treatment method to replace,and its performance in different low temperature environment is less studied.Therefore,in this paper,the Mg-13Gd-4Y-2Zn-0.5Zr alloy in the upside down state is used as the research object to carry out electric pulse solid solution experiments and low temperature tensile tests to study the effects of different electric pulse parameters and different low temperature on the organisational properties of the alloy in order to obtain an efficient solid solution treatment method and to carry out simulation analysis of the change of the pulse current on the temperature field of large plates.The details of the study are as follows:Firstly,Mg-13Gd-4Y-2Zn-0.5Zr rare-earth magnesium alloy was used as raw material for solid solution treatment experiments with different electric pulse parameters to clarify the optimal electric pulse solid solution process parameters.The optimum electric pulse solid solution process parameters were determined to be 150V-350Hz-60μs-15 min by analyzing the microstructure and mechanical properties of the material after treatment with different electric pulse parameters.Secondly,the Mg-13Gd-4Y-2Zn-0.5Zr rare-earth magnesium alloy was subjected to tensile tests at different low temperatures(0°C,-50°C,-100°C and-150°C)after treatment with the optimum electric pulse solid solution parameters and conventional solid solution treatment to analysy the effects of different low temperature temperatures on the microstructure and mechanical properties of the alloy.The material tensile strength and yield strength increased with decreasing temperature and elongation decreased with decreasing temperature.The properties of the electro-pulsed solid-solution alloy can reach or even outperform those of the conventional solid-solution alloy.Finally,the temperature field simulation analysis is carried out on small-sized plates based on the electric pulse solid solution experiments,and the finite element model of electric pulse solid solution treatment is established.