High strength and ductility of titanium matrix composites by nanoscale design in selective laser melting

作     者：Joseph A.Otte Jin Zou Matthew S.Dargusch Joseph A.Otte;Jin Zou;Matthew S.Dargusch

作者机构：School of Mechanical and Mining EngineeringThe University of QueenslandBrisbaneQLD 4072Australia Center for Microscopy and MicroanalysisThe University of QueenslandBrisbaneQLD 4072Australia 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2022年第118卷第23期

页      面：114-127页

核心收录：

学科分类：0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 

基　　金：support of the School of Mechanical and Mining Engineering and the Queensland Center for Advanced Materials Processing and Manufacturing through the ARCresearch hub IH150100024 

主　　题：Additive manufacturing Selective laser melting Metal matrix composite Mechanical properties Nanostructure Nanowires 

摘      要：The use of selective laser melting(SLM)to produce titanium matrix composites(TMCs)with high strength while retaining sufficient tensile ductility suitable for structural applications is emerging as an attractive opportunity in the field of advanced ***,the presence of coarse ceramic reinforcements as well as difficulties in optimizing the SLM process is a barrier to the application of *** this study,we demonstrated the production of TMCs reinforced with in situ high aspect ratio Ti B nanowhiskers by selective laser melting using nanosized BN powder *** Ti with 2.5 vol.%nanosized BN powder showed promise for producing high performance TMCs with retained *** acted to produce Ti B nanowhiskers with diameter50 ***,by controlling post process furnace annealing Ti B retained a low diameter but exhibited a high aspect ratio,up to *** addition to Ti B refinement,nanosized BN addition promoted grain refinement during SLM,both acting as a solute to induce nucleation events and,as Ti B is formed,providing nucleation sites leading to an ultrafine grain structure in as printed samples and after *** produced TMCs exhibit high tensile yield strength,up to1392 MPa,while retaining tensile ductility up to 10%.This study has shown how nanoscale design in powder bed fusion additive manufacturing techniques can be used to produce high performance TMCs through a combination of refined grain structure and high aspect ratio Ti B leading to TMCs with significant improvement in strength,isotropic properties and retained tensile ductility.