|About this Abstract
||2019 TMS Annual Meeting & Exhibition
||Solidification Processing of Light Metals and Alloys: An MPMD Symposium in Honor of David StJohn
||Selective Laser Melting: Case Studies in Aluminium and Titanium Alloys
||Peng Cao, Ruidi Li, Tiecui Yuan
|On-Site Speaker (Planned)
This work reports two case studies in Al and Ti alloys produced by selective laser melting. The first case is a novel scandium modified Al-Mg alloy, which demonstrates a microstructure consisting of coarse columnar and fine equiaxed grains. The fine grained band is beneath the weld pool while the coarse epitaxial columnar grains are located in the central zone of the central zone of the weld pool. The tensile strength of the as-printed Sc-containing Al is 460MPa. After heat treatment, the tensile strength is approaching 508 MPa. In the second case, a Ti-13Nb-13Zr alloy with low elastic modulus was printed for biomedical applications. The printed samples show no elemental segregation because of the complete melting and repeatedly re-melting. The refined microstructure is due to the high cooling rate in SLM process. The tensile strength of the titanium alloy is much higher than those obtained by powder metallurgy.