Effect of solution and aging temperature on microstructure and mechanical properties of WE43 Mg alloy fabricated by laser powder bed fusion
The preparation of WE43 magnesium alloy material by laser powder bed fusion(LPBF)can rapidly form complex shaped parts,but the uneven residual stress and porosity limit the mechanical properties of LPBF magnesium alloys.Post-heat treatment is one of the effective methods to solve this problem.The effect of two heat treatment processes on the mechanical properties and microstructure of the WE43 magnesium alloy prepared by LPBF was studied.The results show that after solution treatment at 425 ℃ and 525 ℃ and aging at 200 ℃ and 250 ℃,the basal plane of hexagonal grain texture begins to trend towards parallel deposition planes,and the orientation begins to appear.With the increase of solution and aging temperature,the grains of the alloy begin to reorganize and their sizes increase,the tensile strength at room temperature decreases,the tensile strength during in situ tensile at 200 ℃ is even lower,and the plasticity gradually increases.The room temperature tensile fracture morphology of the alloy exhibits a mixture of brittle and ductile fracture characteristics,while the in-situ tensile fracture at 200 ℃ shows ductile fracture characteristics.
laser powder bed fusionsolution agingtexturemechanical property
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