Abstract
The effect of energy density on formability, microstructure and micro-hardness of Sc- and Zr- modified 7075 aluminum alloy fabricated by selective laser melting (SLM) has been studied. It was observed that, with the increase of energy density, the density of block specimen increased firstly and then remained unchanged. When the energy density is 375 J/mm3, the roughness of surface decreased from 20.1 to 8.5. That's because the temperature of melt pool increased with the increase of energy input. What's more, the spreading and solute redistribution of melt pool were further improved. Due to heterogeneous nucleation mechanism of Al3(Sc, Zr) particles, the grain refinement is obvious and the average grain size is 0.78 μm at the energy density of 375 J/mm3. With the combination effect of grain refinement and chemical composition, the micro-hardness increased firstly and then decreased with the increase of energy density.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
