Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8044181 | Vacuum | 2018 | 10 Pages |
Abstract
Changes in the microstructure and the mechanical properties of AlSi10â¯Mg alloy fabricated by selective laser melting combined with the subsequent heat treatment have been studied. The influence of the heat treatment on the molten pool boundary softening, microstructure evolution and the resultant mechanical properties has been elucidated. The as-fabricated specimens exhibited the various Si phase patterns within the different regions of the molten pool corresponding to the columnar perpendicular to the molten pool boundary and cellular columnar in the upper center region due to the various thermal behaviors. The solubility of Si atoms was decreased and rejected into fine Si particles with the formation of the molten pool boundary softening and the homogeneous distribution in the heat induced part, playing a key role in the mechanical properties of AlSi10â¯Mg alloy. The ultimate tensile strength decreased from 476.8â¯MPa for the as-fabricated part to 320.5â¯MPa while, the fracture ductility significantly increased from 7.33% to 13.3% as the test specimens were heat treated at 573â¯K for 2â¯h. It indicated that the microstructure evolution and tensile properties of the as-fabricated AlSi10â¯Mg alloy could be tailored through molten pool softening and size and morphology of the Si phase at the suitable heat treatments.
Related Topics
Physical Sciences and Engineering
Materials Science
Surfaces, Coatings and Films
Authors
Donghua Dai, Dongdong Gu, Han Zhang, Jiayao Zhang, Yuexin Du, Tong Zhao, Chen Hong, Andres Gasser, Reinhart Poprawe,