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

Journal of Materials science & Technology 2022年第23期118卷 114-127页

作者： Joseph A.Otte Jin Zou matthew s.dargusch school of Mechanical and Mining Engineering The University of QueenslandBrisbaneQLD 4072Australia Center for Microscopy and Microanalysis The University of QueenslandBrisbaneQLD 4072Australia

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 diameterst 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.

关键词： Additive manufacturing selective laser melting Metal matrix composite Mechanical properties Nanostructure Nanowires

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Current understanding of the origin of equiaxed grains in pure metals during ultrasonic solidification and a comparison of grain formation processes with low frequency vibration,pulsed magnetic and electric-current pulse techniques

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Journal of Materials science & Technology 2021年第6期65卷 38-53页

作者： Nagasivamuni Balasubramani Gui Wang David H.st John matthew s.dargusch Centre for Advanced Materials Processing and Manufacturing(AMPAM) School of Mechanical and Mining EngineeringUniversity of QueenslandSt Lucia

The formation of fine,non-dendritic equiaxed grains throughout a casting without the addition of refiners(*** of alloy chemistry),is made possible by using ultrasonic,magnetic or pulsed magnetic and electric current pulse *** dominant mechanisms proposed for the grain refinement produced during the application of an external field are cavitation phenomena assisted nucleation or fragmentation of dendrites(ultrasonic field),wall crystals arising from the cold surface of the mould(electric current pulse,magnetic and pulsed magnetic fields).In all these cases fluid flow provides an additional contribution(*** temperature gradients,growth rate and remelting of dendrites)to maintaining an equiaxed grain *** origin of equiaxed grains under an external field also depends on the casting conditions(volume and shape of casting)and the type of alloy other than the mechanisms specific to a particular *** current work aims to provide a detailed understanding of the various factors and mechanisms that influence the grain refinement achieved during the solidification of pure metals(magnesium and zinc)subjected to Ultra sonic Treatment(UsT).The role of the temperature range of UsT application,time duration and an unpreheated sonotrode are examined with respect to the origin,evolution of equiaxed grain structure,morphology and the columnar to equiaxed *** origin of grains was analysed from three fundamental aspects that contribute to refinement(i)heterogeneous nucleation(ii)fragmentation of existing dendrites and(iii)grains produced from the colder surfaces(arising from mould walls or vibrating surfaces as wall crystals).A comparison of UsT refinement with mechanical,low-frequency vibration,electric current pulse and magnetic field solidification of pure metals has also been provided to highlight the importance of the cold surfaces(sonotrode and mould wall)in influencing grain refinement.

关键词： Ultrasonic treatment Grain refinement Equiaxed grains Magnesium Zinc solidification

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Microstructure modification and corrosion resistance enhancement of die-cast Mg-Al-Re alloy by sr alloying

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Journal of Magnesium and Alloys 2021年第3期9卷 950-963页

作者： matthew s.dargusch Zhiming shi Hanliang Zhu Andrej Atrens Guang-Ling song The University of Queensland Centre for Advanced Materials Processing and Manufacturing(AMPAM)School of Mechanical and Mining EngineeringBrisbaneQLD 4072Australia Australian Nuclear science&Technology Organisation Locked Bag 2001Kirrawee DCSydneyNSW 2232Australia The University of Queensland Materials EngineeringSchool of Mechanical and Mining EngineeringBrisbaneQld 4072Australia state Key Lab for Physical Chemistry of solid state surfaces Center for Marine Materials Corrosion and ProtectionCollege of MaterialsXiamen UniversityXiamenFujian 361005China

The effects of sr additions on the microstructure and corrosion performance of a Mg-Al-RE alloy in 3.5 wt.%Na Cl saturated with Mg(OH)_(2) have been *** examination reveals that the sr addition introduces additional intermetallic phases,refines intermetallic networks and dendritic grains,and improves the network *** Al and rare earth elements can be identified in the intermetallics and grain boundaries or inter-dendrite regions under a transmission electron microscope and secondary electron microscope,*** the sr-containing intermetallic phases and the refined microstructure,the oxide films become more protective,resulting in more corrosion resistant boundary areas and thus dendrite grain ***,the presence of large amounts of intermetallics and boundaries can enhance the corrosion performance of the Mg-Al-RE alloy containing sr.

关键词： A.magnesium B.TEM B.sEM C.segregation C.Alkaline corrosion

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A comparative study of the role of solute,potent particles and ultrasonic treatment during solidification of pure Mg,Mg-Zn and Mg-Zr alloys

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Journal of Magnesium and Alloys 2021年第3期9卷 829-839页

作者： Nagasivamuni Balasubramani Gui Wang Mark A.Easton David H.st John matthew s.dargusch Centre for Advanced Materials Processing and Manufacturing(AMPAM) School of Mechanical and Mining EngineeringThe University of QueenslandBrisbane 4072Australia school of Engineering RMIT UniversityCarlton3053 VICAustralia

Ultrasonic treatment(UsT)applied during the solidification of pure Mg,eutectic(Mg-Zn)and peritectic(Mg-Zr)alloys was investigated in order to explore the grain refinement *** dependent grain refinement is observed in pure Mg where decreasing the superheat temperature(at which UsT is applied from above the melting temperature,TM)from 100℃to 40℃produces significant refinement with a uniform grain *** presence of solute reduces the temperature dependence of the UsT refinement and excellent grain refinement is obtained regardless of the superheat temperature(100℃or 40℃)and even with the use of preheated sonotrode in the Mg-6 wt.%Zn alloy.A further improvement in grain refinement is achieved when the alloy contains potent particles that introduce additional nucleation of grains in Mg-0.5 and 1.0 wt.%Zr alloys(producing an average grain size of≤100μm).At 40℃superheat,UsT of Mg-Zn alloys produces excellent refinement(average grain sizes,which is normally achieved only with the addition of grain refining master alloy in the as-cast *** enhanced refinement observed in the eutectic alloy is explained through the undercooling imposed by a relatively cold sonotrode combined with high frequency vibrations and acoustic *** advantages of using a cold sonotrode,a low superheat and solute are demonstrated for achieving significant refinement during solidification of Mg alloys under UsT without or with a lower addition of grain refining master alloys.

关键词： Grain refinement Mg-Zn alloy Mg-Zr alloy Ultrasonic treatment Interdependence Model solidification

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Effect of corrosion inhibiting compounds on the corrosion behaviour of pure magnesium and the magnesium alloys EV31A, WE43B and ZE41A

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Journal of Magnesium and Alloys 2021年第2期9卷 432-455页

作者： Akif soltan matthew s.dargusch Zhiming shi Fiona Jones Barry Wood Darren Gerrard Andrej Atrens school of Mechanical and Mining Engineering The University of QueenslandBrisbaneQld 4072Australia UQ Materials Performance The University of QueenslandBrisbaneQld 4072Australia Centre for Microscopy and Microanalysis The University of QueenslandBrisbaneQld 4072Australia Defence Materials Technology Centre DMTC LimitedLevel 224 Wakefield StreetHawthornVic 3122Australia Defence science and Technology Group 506 Lorimer StreetFishermans BendVic 3207Australia

This paper studied corrosion of pure Mg and the Mg alloys EV31A,WE43B,ZE41A,coated with commercial corrosion inhibiting compounds(CICs)(LPs 3,LPs2,AMLGuard,Ardrox 3961)immersed in 3.5 wt%(0.6M)Na Cl solution saturated with Mg(OH)_(2).All four CICs reduced corrosion *** 3 resulted in zero corrosion rates and 100%inhibition in most *** 2 and AMLGuard had comparable inhibition efficiencies,whilst Ardrox 3961 had the lowest inhibition *** in corrosion rates was tentatively attributed to barrier films formed by chemical adsorption for LPs 3 and AMLGuard,and by physical adsorption for LPs2 and Ardrox 3961.

关键词： Magnesium Weight loss Hydrogen evolution XPs FTIR Corrosion inhibition

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surface modification of biomedical Mg-Ca and Mg-Zn-Ca alloys using selective laser melting: Corrosion behaviour, microhardness and biocompatibility

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Journal of Magnesium and Alloys 2021年第6期9卷 2155-2168页

作者： Xiyu Yao Jincheng Tang Yinghao Zhou Andrej Atrens matthew s.dargusch Bjoern Wiese Thomas Ebel Ming Yan school of Materials science and Engineering Harbin Institute of TechnologyHarbin 150001China Department of Materials science and Engineering Southern University of Science and TechnologyShenzhen 518055China The University of Queensland School of Mechanical and Mining EngineeringCentre for Advanced Materials Processing and Manufacturing(AMPAM)QLD 4072 Australia Institute of Materials Research Helmholtz-Zentrum GeesthachtGeesthacht 21502Germany

Magnesium alloys such as Mg–Ca and Mg–Zn–Ca are good orthopaedic materials;however their tendency to corrode is *** we utilize selective laser melting(sLM)to modify the surface of these Mg alloys to simultaneously improve the corrosion behaviour and *** corrosion rate decreased from 2.1±0.2 mm/y to 1.0±0.1 mm/y for the laser-processed Mg–0.6Ca,and from 1.6±0.1 mm/y to 0.7±0.2 mm/y for laser-processed Mg–0.5Zn–*** microhardness increased from 46±1 HV to 56±1 HV for Mg–0.6Ca,and from 47±3 HV to 55±3 HV for Mg–0.5Zn–*** addition,good biocompatibility remained in the laser processed Mg *** improved properties are attributed to laser-induced grain refinement,confined impurity elements,residual stress,and modified surface *** results demonstrated the potential of sLM as a surface engineering approach for developing advanced biomedical Mg alloys.

关键词： Mg alloys selective laser melting surface modification Corrosion behaviour Microhardness

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A state-of-the-art review on passivation and biofouling of Ti and its alloys in marine environments

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Journal of Materials science & Technology 2018年第3期34卷 421-435页

作者： shaokun Yan Guang-Ling song Zhengxian Li Haonan Wang Dajiang Zheng Fuyong Cao Miroslava Horynova matthew s.dargusch Lian Z-hou Center for Marine Materials Corrosion&Protection State Key Laboratory of Physical Chemistry of Solid SurfacesCollege of MaterialsXiamen University422 S.Siming Rd.Xiamen 361005China Corrosion&Protection Research Lab Northwest Institute for Non-ferrous Metal ResearchXi'an 710016China Centre for Advanced Materials Processing and Manufacturing(AMPAM) School of Mechanical and Mining EngineeringThe University of QueenslandBrisbaneQld 4072Australia Nanjing Tech University Nanjing 211800China

High strength-to-weight ratio, commendable biocompatibility and excellent corrosion resistance make Ti alloys widely applicable in aerospace, medical and marine industries. However, these alloys suffer from serious biofouling, and may become vulnerable to corrosion attack under some extreme marine conditions. The passivating and biofouling performance of Ti alloys can be attributed to their compact, stable and protective films. This paper comprehensively reviews the passivating and biofouling behavior, as well as their mechanisms, for typical Ti alloys in various marine environments. This review aims to help extend applications of Ti alloys in extremely harsh marine conditions.

关键词： Ti alloy Passivity Biofouling

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stress corrosion cracking of high-strength AZ31 processed by high-ratio differential speed rolling

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Journal of Magnesium and Alloys 2015年第4期3卷 271-282页

作者： Zhiming shi W.J.Kim Fuyong Cao matthew s.dargusch Andrej Atrens Materials Engineering School of Mechanical and Mining EngineeringThe University of QueenslandBrisbaneQld 4072Australia Centre for Advanced Materials Processing and Manufacturing(AMPAM) The University of QueenslandBrisbaneQld 4072Australia Department of Materials science&Engineering Hongik University72-1 Mapo-guSangsu-dongSeoul 121-791Republic of Korea

stress corrosion cracking(sCC)in distilled water was studied for AZ31,processed by differential-speed-rolling to different strengths,using Linear Increasing stress Tests(LIsTs).The stress corrosion crack velocity was 5.0±2.5×10^(−9) m s^(−1),independent of applied stress rate and independent of material *** susceptibility was greater at lower applied stress rates manifest most importantly as a lower threshold stress for stress corrosion crack *** susceptibility could be characterised by the ratio of threshold stress to yield stress,which was dependent on processing details and was as low as 0.3.

关键词： Magnesium LIsT sEM stress corrosion

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表面肝素改性TLM钛合金的血液相容性评价(英文)

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稀有金属材料与工程 2009年第3期38卷 384-388页

作者：余森于振涛王贵 matthew s.dargusch 张明华西北有色金属研究院陕西西安710016 CAsTCRC 昆士兰大学工程学院澳大利亚布里斯班4072 第四军医大学唐都医院全军骨肿瘤研究所陕西西安710038

在新型近β钛合金TLM(Ti-3Zr-2sn-3Mo-25Nb)表面用溶胶-凝胶法镀上一层TiO2薄膜,再将薄膜依次用羟基化溶液和胺基化溶液处理以在薄膜表面引入活性OH-和NH2-,然后通过该活性官能团将肝素共价键接在薄膜表面。利用XRD、sEM和EDs研究了TiO... 详细信息

在新型近β钛合金TLM(Ti-3Zr-2sn-3Mo-25Nb)表面用溶胶-凝胶法镀上一层TiO2薄膜,再将薄膜依次用羟基化溶液和胺基化溶液处理以在薄膜表面引入活性OH-和NH2-,然后通过该活性官能团将肝素共价键接在薄膜表面。利用XRD、sEM和EDs研究了TiO2薄膜的相结构和表面特性;通过测定材料表面的接触角、溶血率和血小板黏附行为对肝素化TLM合金的血液相容性进行分析、评价。结果表明,表面肝素化处理后TLM合金的血液相容性得到了明显的改善。

关键词：血液相容性肝素化 TLM合金薄膜表面改性

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2.5维织物C_f/Al复合材料制备及其经纬向拉伸变形力学行为研究

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稀有金属材料与工程 2017年第12期46卷 3744-3752页

作者：王振军董敬涛 Gui Wang 余欢徐志锋 matthew s.dargusch 南昌航空大学轻合金加工科学与技术国防重点学科实验室江西南昌330063 Centre of Advanced Materials Processing and Manufacturing The University of Queensland

以石墨纤维2.5维机织物为增强体,铝合金ZL301为基体材料,采用真空辅助压力浸渗法制备了2.5维织物Cf/Al复合材料,研究了3种织物预热温度下制备的复合材料相对致密度和微观组织形貌,分析了其界面产物组成与界面结构特征,测试了其经、纬向... 详细信息

以石墨纤维2.5维机织物为增强体,铝合金ZL301为基体材料,采用真空辅助压力浸渗法制备了2.5维织物Cf/Al复合材料,研究了3种织物预热温度下制备的复合材料相对致密度和微观组织形貌,分析了其界面产物组成与界面结构特征,测试了其经、纬向准静态拉伸变形力学行为并分析了其断口形貌。结果表明:复合材料织物的细观结构完整,内部纤维分布均匀,致密度随预热温度提高而略有上升,界面棒状产物为Al4C3相,其相对含量随预热温度的提高而增加,从而引起复合材料经向和纬向力学性能的下降。复合材料经向拉伸强度高于纬向拉伸强度,且其应力-应变行为呈现出显著的非线性特征,复合材料经向和纬向拉伸变形过程均可划分为3个阶段:初始弹性变形阶段、中间弹塑性变形阶段和最终损伤与断裂阶段。

关键词： 2.5维织物 Cf/Al复合材料微观组织界面力学行为

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