The Effect Of Cerium And Beryllium Microalloying And Annealing Process On Microstructure And Properties Of Al-Mg Alloy

As a new kind of shielding function material, Al-Mg alloy wire can take the place of pure copper round wire and become the main force in the field of information transmission because of its high tensile strength,good oxidation corrosion resistance and shielding performance,excellent electrical conductivity and stitchability.The researchment and development of Al-Mg alloy conductor material with more excellent plasticity and conductivity has important strategic significance.The effect of cerium and beryllium microalloying and annealing process on microstructure and properties of Al-Mg alloy was studied by means of mechanical properties and physical properties test at room temperature,microscopic microstructure observation(OM),scanning electron microscopy(SEM) and transmission electron microscopy analysis (TEM).The conclusions were listed as follows:1.Adding0.3%Be and0.3%Ce to Al-Mg alloy respectively can not only make its grain thinner and structure uniformer,but also improve its mechanical property and conductivity.The effect of refinement is best when0.3%Be and0.3%Ce are added together.2.Adding0.3%Be to Al-Mg alloy has no obvious effect on dislocation configuration, which presents quasi-homogeneous and quasi-periodic and is called "Taylor lattice distribution", while adding0.3%Ce can change its dislocation configuration, which changes from barriers of high density of dislocation tangles to form the cellular structure and the grain boundary.3.With the annealing temperatures increasing from300℃to500℃, the tensile strength and electric resistivities of specimens decrease,which reach225.92MPa and43.82nΩ.m respectively at500℃.but its elongation increases and reaches24.68%at500℃.4.A large number of smaller toughening dimples and evenly distributed micro holes can be observed on fractures of each state of5154aluminum alloy wires,which shows that specimens’fracture mode is mainly ductile fracture.Annealed for1h,the annealing temperature has little effect on fracture morphology of specimens between300℃and 500℃,while the dimples of specimens anealed at500℃appear bigger and deeper.