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Grain refinement in low SFE and particle-containing nickel aluminium bronze during severe plastic deformation at elevated temperatures

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Journal of Materials Science & Technology 2021年第23期82卷 57-68页

作者： C.J.Barr K.Xia Department of Mechanical Engineering University of MelbourneVictoria3010Australia dmtc ltd. 24 Wakefield St.HawthornVIC3122Australia

The influence of particle size and morphology on grain refinement in low stacking fault energy(SFE)alloys was studied by comparing the grain structures in single-and multi-phase Al-bronze(AB)alloys following equal channel angular pressing(ECAP)between 350 and 500℃.In particular,nickel aluminium bronze(NAB)was chosen as it contained both coarse and fine rounded particles,as well as a lamellar phase which evolved during *** refinement in the single-phase alloy was achieved through dynamic recrystallisation initiated at deformed twin *** contrast,different mechanisms were observed in the particle-containing *** around the coarseκⅡparticles(~5μm)was promoted through particle stimulated nucleation(PSN),whereas recrystallisation in the region of the fineκⅣ(~0.4μm)was delayed due to the activation of secondary *** refinement in areas of the lamellarκⅢshowed significant variation,depending on the lamellar orientation relative to the shear plane of *** the lamellae deformed,numerous high angle grain boundaries were generated between fragments and served as nucleation sites for recrystallisation,while PSN occurred around spheroidised *** spreading of theκⅢparticles by ECAP then enhanced the total area of recrystallised grains.

关键词： Equal channel angular pressing Copper alloys Grain refinement Stacking fault energy Severe plastic deformation

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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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