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The latest development of Sc-strengthened aluminum alloys by laser powder bed fusion

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Journal of Materials Science & Technology 2023年第18期149卷 1-17页

作者： Dina Bayoumy Wenhao Kan Xinhua Wu Yuman Zhu aijun huang Monash Centre for Additive Manufacturing 15-17 Normanby RoadNotting HillVIC 3168Australia Department of Materials Science and Engineering Monash UniversityClaytonVIC 3800Australia

Laser powder bed fusion(LPBF)is one of the typical additive manufacturing techniques that enables the fabrication of complex-shaped structures with great freedom of *** to the challenges encoun-tered in LPBF processing of Al alloys,most studies have focused on AlSi alloys which are much easier to process but are not inherently designed for high-strength *** recent years,however,signif-icant progress has been made to develop Sc-containing Al alloys that are designed specifically for LPBF *** alloys display excellent processability and superior mechanical properties that open up a range of possible applications in industries that require high specific strength,good thermal stability,and increased *** such,this paper reviews the available literature on how Sc additions in-fluence the microstructure and properties of Al alloys when processed via LPBF and thus,aims to shed light on the considerations that have been made to achieve remarkable material consolidation alongside excellent mechanical properties,with the latter achieved through a high degree of Sc supersaturation and a great potential for nanoprecipitation.

关键词： Aluminum alloys Scandium Additive manufacturing Laser powder bed fusion Mechanical property Microstructure

Microstructure, tensile properties and mechanical anisotropy of selective laser melted 304L stainless steel

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Journal of Materials Science & Technology 2020年第13期47卷 63-71页

作者： Juan Hou Wei Chen Zhuoer Chen Kai Zhang aijun huang School of Materials Science and Engineering University of Shanghai for Science and TechnologyShanghai 200093China Monash Center for Additive Manufacturing(MCAM) Monash UniversityNotting HillVIC 3168Australia

The microstructure and mechanical properties of 304 L stainless steel fabricated by selective laser melting are investigated in this *** the optimized laser processing parameters,a relative density of 99.9%is achieved with fine austenite grains and nanoscale cellular subgrains in size of approximately 0.5μ*** presence ofδ-ferrite andσphase precipitates is identified by the x-ray diffraction and transmission electron ***,the microstructure is identified as an austenite matrix with about 4%δ-ferrite and a trace amount ofσphase by using electron backscattered diffraction *** smallσphase particles are mainly distributed along austenite grain ***,the presence of nanoscale cellular subgrains contributes to the good tensile strength and ductility of the selective laser melted 304 L,along with precipitate strengthening and strain *** property anisotropy is also identified in this 304 L,which is attributed to the microstructure difference on vertical and horizontal planes.

关键词： Selective laser melting Microstructure Tensile property anisotropy 304L stainless steel

Effect of solution heat treatment and hot isostatic pressing on the microstructure and mechanical properties of Hastelloy X manufactured by electron beam powder bed fusion

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Journal of Materials Science & Technology 2022年第3期98卷 99-117页

作者： Amal Shaji Karapuzha Darren Fraser Yuman Zhu Xinhua Wu aijun huang Department of Materials Science and Engineering Monash UniversityVictoria 3800Australia Monash Centre for Additive Manufacturing 15-17 Normanby RdNotting HillVIC 3168Australia Manufacturing Unit CSIROClaytonVictoria 3168Australia

Prior to the application of AM components for critical applications,it is necessary to have a better understanding of the effect of different post-fabrication treatments on the microstructure and mechanical properties of such *** this study,efforts were made to achieve an in-depth understanding of the effect of post-fabrication Solution Heat Treatment(SHT)and Hot Isostatic Pressing(HIP)on the microstructure and mechanical properties of Hastelloy X parts built by electron beam powder bed fusion(PBF-EB)*** effects of SHT and HIP on porosity,microstructure,texture and mechanical properties have been investigated and compared with that of as-built PBF-EB Hastelloy ***-fabrication HIP treatment led to a significant reduction in the porosity content,whereas no notable difference in porosity was observed between SHT and as-built *** was no evidence of any recrystallization occurring following the post-fabrication treatments as elongated columnar grain structures observed within as-built part were found to be maintained even after SHT and HIP process alongside the strongcrystallographic *** was laid upon understanding the influence of SHT and HIP on mechanical properties through stress-strain curves and work-hardening behaviour.

关键词： Additive manufacturing Electron beam powder bed fusion Nickel-based superalloy Heat treatment Hot isostatic pressing

Unravelling the competitive effect of microstructural features on the fracture toughness and tensile properties of near beta titanium alloys

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Journal of Materials Science & Technology 2022年第2期97卷 101-112页

作者： Yang Liu Samuel C.V.Lim Chen Ding aijun huang Matthew Weyland Department of Materials Science and Engineering Monash UniversityClaytonVIC3800Australia Monash Centre for Additive Manufacturing Monash UniversityNotting HillVIC3168Australia BAOWU Special Metallurgy Co.Ltd. Shanghai200940China Monash Centre for Electron Microscopy Monash UniversityClaytonVIC3800Australia

The competitive effect of microstructural features including primaryα(α_(p)),secondaryα(α_(s)),grain boundaryα(α_(GB)) and β grain size on mechanical properties of a near β Ti alloy were studied with two heat treatment *** relative effect of β grain size and STA(solution treatment and ageing)processing parameters on mechanical properties were quantitatively explored by the application of Taguchi *** results were further explained via correlating microstructure with the fracture toughness and tensile *** was found that large numbers of fine as precipitates and continuous α_(s) played greater roles than other features,resulting in a high strength and very low ductility(<2%)of STA process *** β grain size had a negative correlation with fracture *** the samples prepared by BASCA( β anneal slow cooling and ageing)process,improved ductility and fracture toughness were obtained due to a lower density ofα;precipitates,a basket-weave structure and zigzag morphology of α_(GB).For this heat treatment,an increase in prior β grain size had an observable positive effect on fracture *** contradictory effect of β grain size on fracture toughness found in literature was for the first time *** was shown that the microstructure obtained from different processes after β solution has complex effect on mechanical *** complexity derived from the competition between microstructure features and the overall sum of their effect on fracture toughness and tensile properties.A novel table was proposed to quasi-quantitatively unravel these competitive effects.

关键词： Nearβtitanium alloys Microstructural features Competitive effect Fracture toughness βgrain size effect

Rolling-assisted direct energy deposited Inconel 718:Microstructural evolution and mechanical properties after optimized heat treatment

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Journal of Materials Science & Technology 2023年第13期144卷 118-127页

作者： Chen Li Peter Hodgson Michael Preuss Yu Chen Xinhua Wu Yuman Zhu Yang Tian aijun huang Department of Material Science and Engineering Monash UniversityClaytonVIC 3800Australia Monash Centre for Additive Manufacturing(MCAM) 15-17 Normanby RdNotting HillVIC 3168Australia Institute for Frontier Materials Deakin UniversityGeelongVIC 3217Australia Monash Centre for Electron Microscopy Monash University10 Innovation WalkClaytonVIC 3800Australia

Post-heat treatment is a necessary and important step for additive-manufactured products to relieve residual stress and to further improve mechanical *** this work,the heat treatment strat-egy for Inconel 718 superalloy fabricated by rolling-assisted laser-directed energy deposition(L-DED)has been designed and systematically investigated for the first *** results show that the designed ho-mogenization heat treatment at 1080℃ for 10 min can effectively dissolve most of the detrimental Lave phases existing in the rolling-assisted L-DED ***,it results in a homogenous grain struc-ture through static recrystallization,while maintaining a similar prior-refined grain size of∼8μ*** this basis,a high number density ofγ″andγ′precipitates appear in the microstructure after applying a subsequent double-aging heat *** optimized microstructure through such effective post-heat treatment designed in this work has led to a significant increase in material strength at both the room and elevated temperatures while maintaining good ductility.

关键词： Additive manufacturing Nickel superalloy In-situ rolling Heat treatment Mechanical properties

Origin of non-uniform plasticity in a high-strength Al-Mn-Sc based alloy produced by laser powder bed fusion

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Journal of Materials Science & Technology 2022年第8期103卷 121-133页

作者： Dina Bayoumy Kwangsik Kwak Torben Boll Stefan Dietrich Daniel Schliephake Jie huang Junlan Yi Kazuki Takashima Xinhua Wu Yuman Zhu aijun huang Monash Centre for Additive Manufacturing 15-17 Normanby RdNotting HillVIC 3168Australia Department of Materials Science and Engineering Monash UniversityClaytonVIC 3800Australia Department of Materials Science and Engineering Kumamoto University2-39-1 KurokamiChuo-kuKumamoto 860-8555Japan Karlsruhe Nano Micro Facility(KNMF) Karlsruhe Institute of Technology(KIT)Hermann-von-Helmholtz-Platz 176344Eggenstein-LeopoldshafenGermany Institute for Applied Materials(IAM-WK) Karlsruhe Institute of Technology(KIT)Engelbert-Arnold-Straße 476131 KarlsruheGermany Aeronautical Manufacturing Technology Institute Shanghai Aircraft Manufacturing Co.Ltd.Shanghai 201324China

The Al-Mn-Sc-based alloys specific for additive manufacturing(AM)have been recently developed and can reach ultrahigh strength and adequate ***,these alloys commonly exhibit nonuniform plasticity during tensile deformation,which is a critical issue hindering their wider *** this work,the origin of this non-uniform plasticity of the alloys produced by laser powder bed fusion(LPBF)has been systematically investigated for the first *** results show that the loss of uniform plasticity in the alloy originates from microstructural regions containing equiaxed fine-grains(FGs)(~650nm in size)at the bottom of the melt *** micro-tensile tests,the strength of these FG regions can reach a peak of~630 *** this,an apparent yield drop occurs,followed by rapid strain *** FG behavior is associated with intermetallic particles along grain boundaries and a lack of uniform mobile dislocations during *** columnar coarse-grain(CG)regions in the remaining melt pools show uniform plasticity and moderate work ***,the quantitative calculations indicate that the solid solution strengthening in these two regions is ***,secondary Al_(3)Sc precipitates contribute to~260 MPa strength in the FG,compared to 310 MPa in the CG due to their different number *** addition,grain boundary strengthening can reach 230 MPa in the FG region;nearly double the CG region value.

关键词： Aluminium alloy Laser powder bed fusion Crystal plasticity Microstructures Strengthening

Helium Bubble Growth in He^(+) Ions Implanted 304L Stainless Steel Processed by Laser Powder Bed Fusion During Post-Irradiation Annealing at 600℃

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Acta Metallurgica Sinica(English Letters) 2022年第9期35卷 1509-1518页

作者： Hui Liu Shiling Min Menglei Jiang Fuzhong Chu Ying Li Zhuoer Chen Kai Zhang Juan Hou aijun huang School of Materials Science and Chemistry University of Shanghai for Science and TechnologyShanghai200093China Department of Industrial and Materials Science Chalmers University of Technology41326GothenburgSweden Monash Centre for Additive Manufacturing(MCAM) Monash UniversityNotting HillVIC3168Australia State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment China Nuclear Power Engineering Co.Ltd.Shenzhen518172China

The abundancy of defect sinks in the microstructure of laser powder bed fusion(LPBF) processed austenitic stainless steels was found to be beneficial for helium *** the current study,the influence of the novel microstructure in LPBF processed 304 L on the helium bubble growth behaviour was investigated using transmission electron microscopy in samples implanted with He^(+) ion and post-irradiation annealing treated at 600℃ for 1 *** variants of LPBF processed 304 L samples were used,one in as-built condition and the other *** comparison between the two samples indicated that the helium bubble growth was inhibited and remained stable in the as-built sample but coarsened significantly in the solution-annealed *** sub-grain boundaries and oxide nano-inclusions acted as defect sinks to trap helium atoms and inhibited the growth of helium bubble in the as-built sample under the post-irradiation annealing conditions used.

关键词： Laser powder bed fusion Stainless steel Helium bubble growth Irradiation tolerance Nano oxide inclusions

Linguistic Form and Function: Expression of Countability in Chinese wh-Phrases

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Language and Semiotic Studies 2015年第4期1卷 34-51页

作者： aijun huang Soochow University

The present paper investigates the relationship between form(morpho-syntax)and function(semantic interpretation)as involved in the expression of countability in the Chinese whpronoun *** focus on three wh-pronouns:duo-shao‘much-little’,duo-shao-ge‘much-little-Classifier’,and ji-ge‘how many-Classifier’.Based on the examination of the interpretation and distribution of these wh-phrases in three distinct linguistic contexts(questions,bare conditionals,and negative statements),we generalize that while duo-shao functions as an indeterminate determiner,duo-shao-ge and ji-ge function as two count *** generalization invites the conclusion that the morpho-syntax of these whphrases,particularly,the presence/absence of a classifi er,determines and shapes their semantic interpretation in *** a more general perspective,the present study suggests that a linguistic form determines its own linguistic functions.

关键词： Chinese wh-pronouns countability morph-syntax classifi ers

Effect of strain rate and temperature on the deformation behavior in a Ti-23.1Nb-2.0Zr-1.0O titanium alloy

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Journal of Materials Science & Technology 2021年第14期73卷 52-60页

作者： Yi Yang Di Xu Sheng Cao Songquan Wu Zhengwang Zhu Hao Wang Lei Li Shewei Xin Lei Qu aijun huang School of Materials Science and Engineering University of Shanghai for Science and TechnologyShanghai 200093China Department of Materials University of ManchesterOxford RoadManchester M139PLUK Institute of Metal Research Chinese Academy of SciencesShenyang 110016China Northwest Institute for Non-ferrous Metal Research Xi'an 710016China Department of Materials Science and Engineering Monash UniversityClayton.VIC 3800Australia

The compression behavior of a Ti-23.1 Nb-2.0 Zr-1.00(at.%)alloy was investigated at strain rates from 0.1 s_(-1) to 1000 s_(-1) and temperatures from 100℃to 200℃on a Gleeble 3800 system and Split Hopkinson Pressure Bar(SHPB)compressive *** microscopy,electron backscatter diffraction(EBSD),Xray diffraction(XRD)and transmission electron microscopy(TEM)were employed to characterize the microstructure evolution during the *** deformation phenomena,including dislocation slip,twinning of both{332}{113)and{112}{111}modes,stress-inducedα"martensite(SIMα")and stress-inducedω(SIω)transformations,were *** preferred activation of twinning and SIωtransfo rmations was observed in the sample compressed at lower temperatures and/or higher strain *** underlying mechanism is that twinning and stress induced phase transfo rmations are attribute to higher stress concentrations atβgrain boundaries and additional energy supplied by a higher strain rate,as well as high stacking fault energy because of higher temperature.

关键词： Titanium alloy Plastic deformation Strain rate Temperature Microstructure