Research On Impact Resistance Of ZK60Magnesium Alloy

With the development of manufacture and process technology, magnesium (Mg) alloywill be one of the best materials in weapon equipment, especially in aerospace and nationaldefense fields, etc. Mg alloy has the highest strength, good plasticity and stain resistance to beone of the most used wrought Mg alloys.In this paper, slow-speed impact experiments for isothermal extrusion deformation stateZK60magnesium alloy on split Hopkinson pressure bar (SPHB) and high-speed impactexperiments for isothermal compression deformation state ZK60magnesium alloy weresystematically studied. Then their value on armor protective aspect was evaluated in order tolay a theoretical foundation for its use, which could direct their engineering applications in themilitary industry. The main research contents and conclusions are as follows:(1)The plastic deformation temperature of ZK60magnesium alloy makes a differencein its dynamic mechanical properties. The isothermal extrusion deformation state specimen of300℃has the largest dynamic yield strength, contrary to the isothermal extrusiondeformation state specimen of380℃, and isothermal extrusion deformation state specimen of340℃as somewhere in between. Besides, when strain rate is1200s-1,1500s-1, the isothermalextrusion deformation state specimen of300℃has the largest ultimate strength, closelyfollowed by isothermal extrusion deformation state specimen of340℃, and isothermalextrusion deformation state specimen of380℃has the least ultimate strength. However, whenstrain rate is2000s-1,2600s-1, the isothermal extrusion deformation state specimen of300℃has the least ultimate strength, contrary to the isothermal extrusion deformation statespecimen of380℃, and isothermal extrusion deformation state specimen of340℃assomewhere in between.(2)When the strain rate is less than or equal to2000s-1, the isothermal extrusiondeformation state specimen of300℃has best energy absorption capability, contrary to theisothermal extrusion deformation state specimen of380℃, and isothermal extrusiondeformation state specimen of340℃as somewhere in between. When the strain rate is 2600s-1, the isothermal extrusion deformation state specimens at three temperature make nodifference.(3)Shear ship appears in the shot hole back of target plate. This states that ZK60magnesium alloy target plate has better defensible performance.(4)The defensible performance of hot compression+T5state ZK60alloy is better. Thecracks hardly appear around the crater. The defensible performance of hot compression+T6state ZK60alloy is less. The vertical cracks obviously appear around the crater. Some hotdeformed Mg alloy has cracks. But some have not cracks and are smooth.(5)The relation between shear depth and mechanical properties of target plate materialis established by linear regression equation (y13.10.03x(y h; x (Rm Rp0.2)(1A)/2);the less is value of y, the better is defensible performance of target plate material). Therelation states that only whenR m,R p0.2and A all could reach the most ideal state, can thematerial obtain excellent defensible performance.