Optimization of Selective Laser Melting Process for Al-Mn-Sc Alloy and Its Mechanical Properties at Room and High Temperature
This article examines the influence of energy density on the density of the Al-4.5Mn-1.5Mg-0.6Sc-0.2Zr alloy,introduces an improved forming methodology,and examines microstructural evolution and mechanical properties at room and high temperature.The results show that as energy density rises,the alloy density initially escalates before subsiding.When the energy density reached 77.6 J/mm3(laser power 275 W,scanning speed 985 mm/s,scanning pitch 0.12 mm,and layer thickness 0.03 mm),defect-free dense alloys were realized.The as-deposited microstructure consists of equiaxed grains and columnar grains,encircled by Mn-rich phases.After aging treated at 300℃for 5 h,a large quantity of nano-sized Al3(Sc,Zr)phase precipitates.Simultaneously,the aged alloy demonstrates outstanding mechanical properties,exhibiting room temperature yield strength,tensile strength,and elongation of 502.3 MPa,536.3 MPa,and 12.3%,respectively.At elevated temperatures(250℃),these remain at 223.5 MPa,299.1 MPa,and 11.5%,respectively.
selective laser meltingAl-Mn-Schigh temperature mechanical properties
万方数据
维普
