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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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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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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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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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3D打印超均匀高性能钛合金

3D打印超均匀高性能钛合金

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第十二届中国金属学会青年学术年会暨首届〝碳中和〞冶金青年科学家沙龙

作者：侯自勇张敬奇 Michael J.Bermingham 刘印刚杨楠尹宇蔺伟康 Mohamad Bayat 靳慎豹沙钢 matthew s.dargusch 黄晓旭重庆大学轻合金材料国际合作联合实验室瑞典皇家理工学院昆士兰大学丹麦科技大学南京理工大学

增材制造(又称3D打印)作为一种灵活高效的材料制备手段,为新型合金设计和产品开发提供了新机遇。对于凝固过程初生相为立方晶胞晶体结构的金属材料,初生晶粒通常沿着熔池最大温度梯度方向择优生长,并且在重熔的条件下呈现很强的外延生... 详细信息

增材制造(又称3D打印)作为一种灵活高效的材料制备手段,为新型合金设计和产品开发提供了新机遇。对于凝固过程初生相为立方晶胞晶体结构的金属材料,初生晶粒通常沿着熔池最大温度梯度方向择优生长,并且在重熔的条件下呈现很强的外延生长倾向。虽然这种具有强织构的柱状晶结构对某些特定的应用有利,但是由于它不仅降低材料的力学性能(尤其是强度)并且还导致力学性能出现各向异性,所以通常被认为是不利组织。另一方面,3D打印所经历的超快速凝固、内禀热循环等,会对沉积材料产生"原位热处理"效应,导致初生相的分解或者新相的析出,进而致使打印构件内的组成相沿着打印方向呈现不均匀分布。前人提出了不同的方法来促进柱状晶向等轴晶转变和晶粒细化。常用方法主要包括工艺控制和添加晶粒细化剂,其中工艺控制方法主要有调控3D打印参数或者引入外部干扰。然而,这种方法的适用性通常局限于特定的合金或者3D打印技术。另外,添加晶粒细化剂的方法虽然行之有效,但是通常会引入或者生成脆性第二相,导致打印构件的塑性严重下降。尤其对于钛合金,实现晶粒细化同时不降低塑性,比其他常用合金(例如铝合金)更具有挑战性。虽然打印后均匀化热处理通常能够消除组成相的不均匀性,但是会增加部件的生产时间与成本,同时对消除柱状晶的作用有限。因此,3D打印构件内部强织构柱状晶与不均匀分布组成相两者共存,对获得均匀且优异的力学性能带来了极大的难度。针对上述问题,研究团队从合金设计角度出发,结合相变热力学、动力学计算结果,以典型工业用钛合金为研究对象,开展了深入系统研究,主要取得了以下成果:(1)以Ti-6Al-4V为研究对象,通过添加适量CP-Ti和Fe2O3,以稀释扩散速率较慢的V、引入扩散速率较快的Fe,提供O强化基体,弥补强度损失,调控打印过程中相变发生的临界条件和速度,打印材料在各阶段均能获得成分均匀的相(组织),消除了性能不均匀性。新合金与传统Ti-6Al-4V合金具有相似的腐蚀行为,钝化区域均在0.5V以上,CP-Ti和Fe2O3颗粒复合添加,抵消少量Fe和O对腐蚀性能的恶化。(2)以Ti-5Al-5Mo-5V-3Cr为模型合金,通过添加钼(Mo)纳米颗粒,实现了单一添加物的双重功能性:在凝固过程,半熔融颗粒为初生β-Ti相提供形核质点,通过晶粒细化消除柱状晶组织;在固态相变过程,熔融的钼溶质在半熔融钼颗粒周围提供一个成分过冷区,从而促进异质形核,抑制有害相析出。双功能性添加剂带来的微观组织变化使合金具有均匀的机械性能,并同时提高了强度和延展性。上述研究成果展示了如何通过单组分改性这种合金来解决不利的微观结构问题,为直接通过3D打印获得理想的机械特性提供了途径。此外,该研究以合金设计指导3D打印,拓展了3D打印制备性能均匀合金的广度,为制备具有均匀性能的未知结构合金提供了新的解决思路和方案。

关键词：增材制造内禀热循环组织均匀性合金设计钛合金

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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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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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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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