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Highly ductile hypereutectic Al-Si alloys fabricated by selective laser melting

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Journal of Materials Science & Technology 2022年第15期110卷 84-95页

作者： Yafeng Yang Kang Geng Shaofu Li michael bermingham R.D.K.Misra State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China School of Mechanical and Mining Engineering University of QueenslandSaint LuciaQueensland 4072Australia Department of Metallurgical Materials and Biomedical EngineeringUniversity of Texas at El Paso500 W University AvenueEl PasoTX 79968USA

In the endeavor to maximize the refinement effect of primary Si and alleviate the inherent brittleness of hypereutectic Al-Si alloy,the approach of coating P as a modifier on powder was *** ultimate aim was to create more heterogeneous fine Al P nucleus and enhance the nucleation efficiency of primary Si on Al P to refine the coarse primary Si to nano-scale during 3D *** the combination of large undercooling and high density of nucleation sites,the size of primary Si was successfully refined to 200–300 nm and the divorced eutectic was also induced to modify the microstructure of *** the presence of nano-scale primary Si,the melting pool boundary(MPB)feature disappeared and the fracture mechanism also changed from load transfer to interfacial *** with the pristine alloy,the ductility was increased four times without significantly changing the ultimate tensile strength(UTS)and wear *** improvement of ductility is attributed to the refinement of primary Si,the disappearance of MPB features and the formation of divorced *** optimal tensile properties were:UTS-482 MPa,yield strength-320 MPa and ductility of 8.1%at 0.05 wt.%*** are comparable to those for high-strength Al alloys.

关键词： Al-Si alloys Heterogeneous nucleation Ductility Powder processing Selective laser melting

Heterogeneous lamella design to tune the mechanical behaviour of a new cost-effective compositionally complicated alloy

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Journal of Materials Science & Technology 2022年第1期96卷 113-125页

作者： Yu Yin Qiyang Tan Qiang Sun Wangrui Ren Jingqi Zhang Shiyang Liu Yingang Liu michael bermingham Houwen Chen Ming-Xing Zhang School of Mechanical and Mining Engineering University of QueenslandQLD 4072Australia College of Materials Science and Engineering Chongqing UniversityChongqing 400044China

A heterogeneous lamella(HL)design strategy was applied to manipulate mechanical properties of a new cost-effective Fe_(35)Ni_(35)Cr_(25)Mo_(5)compositionally complicated alloy(CCA).The HL structure was produced by single-step heat treatment(800℃for 1 h)after cold *** HL structure consists of alternative lamellae regions of coarse-grained FCC matrix(5-20μm),and regions containing ultra-fine grains or subgrains(200-500 nm)together with nanoprecipitates(20-500 nm)and annealing *** compared with other cost-effective CCAs,the 800℃annealed sample with HL structure demonstrated a comparable tensile property,with yield strength over 1.0 GPa and total elongation of~13%.Formation of the annealing twins and nanoprecipitates decorated HL structure was a result of the concurrent partial recrystallization and precipitation ofσphase at the shear bands with a high density of lattice defects(***-density dislocation walls and deformation twins).The latter restricted the growth of recrystallized grains,leading to the formation of ultrafine subgrains within the HL *** high yield strength resulted from the multistage hetero-deformation induced(HDI)strengthening and precipitation strengthening associated with heterogeneous lamella structures containing *** ductility was originated from the coexistence of multiple deformation mechanisms,which started with dislocation slip and formation of stacking faults at the initial stage,followed by nano-twinning at the higher strain *** HL design strategy,comprising composition and thermomechanical process designs,and the resultant microstructure tuning,open a broader window for the development of cost-effective CCAs with enhanced performance.

关键词： High entropy alloys Compositionally complicated alloys Heterogeneous lamella structure Nanoprecipitates Recrystallization Mechanical properties

Manufacturing of graded titanium scaffolds using a novel space holder technique

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Bioactive Materials 2017年第4期2卷 248-252页

作者： Yunhui Chen Damon Kent michael bermingham Ali Dehghan-Manshadi Gui Wang Cuie Wen Matthew Dargusch Queensland Centre for Advanced Materials Processing and Manufacturing(AMPAM) The University of QueenslandSt.Lucia4072Australia School of Science and Engineering University of the Sunshine CoastMaroochydore DCQLD4558Australia ARC Research Hub for Advanced Manufacturing of Medical Devices Australia School of Engineering RMIT UniversityMelbourne3001Australia

To optimize both the mechanical and biological properties of titanium for biomedical implants,a highly flexible powder metallurgy approach is proposed to generate porous scaffolds with graded porosities and pore *** pellets acting as space holders were compacted with titanium powder and then removed by dissolution in water before *** morphology,pore structure,porosity and pore interconnectivity were observed by optical microscopy and *** results show that the porous titanium has porosity levels and pore size gradients consistent with their design with gradual and smooth transitions at the interfaces between regions of differing porosities and/or pore ***,the porous titanium has high interconnectivity between pores and highly spherical pore *** this article we show that this powder metallurgy processing technique,employing the novel sugar pellets as space-holders,can generate porous titanium foams with well-controlled graded porosities and pore *** method has excellent potential for producing porous titanium structures for hard tissue engineering applications.

关键词： Porous scaffolds Titanium Powder metallurgy Space holder Graded porosity

Challenges in laser-assisted milling of titanium alloys

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International Journal of Extreme Manufacturing 2021年第1期3卷 71-84页

作者： Matthew S Dargusch Tharmalingam Sivarupan michael bermingham Rizwan Abdul Rahman Rashid Suresh Palanisamy Shoujin Sun Centre for Advanced Material Processing and Manufacturing(AMPAM) School of Mechanical and Mining EngineeringThe University of QueenslandBrisbaneAustralia DMTC Ltd. HawthornMelbourneVictoriaAustralia Faculty of Science Engineering and TechnologySwinburne University of TechnologyHawthornMelbourneVictoriaAustralia School of Engineering and Built Environment Griffith UniversityGold CoastQueenslandAustralia

Several detailed studies have comprehensively investigated the benefits and limitations of laser-assisted machining(LAM)of titanium *** studies have highlighted the positive impact of the application of laser preheating on reducing cutting forces and improving productivity but have also identified the detrimental effect of LAM on tool *** paper seeks to evaluate a series of the most common cutting tools with different coating types used in the machining of titanium alloys to identify whether coating type has a dramatic effect on the dominant tool wear mechanisms active during the *** findings provide a clear illustration that the challenges facing the application of LAM are associated with the development of new types of cutting tools which are not subjected to the diffusion-controlled wear processes that dominate the performance of current cutting tools.

关键词： laser-assisted machining tool life tool wear titanium alloys

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3D打印超均匀高性能钛合金

3D打印超均匀高性能钛合金