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Bioactive Materials 2020年第4期5卷 891-901页

作者： Yee-Hsien Ho Kun Man Sameehan S.Joshi Mangesh V.Pantawane Tso-Chang Wu Yong Yang Narendra B.Dahotre laboratory for laser aided additive and subtractive manufacturing Department of Materials Science and EngineeringUniversity of North Texas1150 Union Circle 305310DentonTX76203-5017USA Department of Biomedical Engineering University of North Texas1150 Union Circle 305310DentonTX76203-5017USA

The present study aims to evaluate effect of hydroxyapatite(HA,Ca10(PO4)6OH2),a ceramic similar to natural bone,into AZ31B Mg alloy matrix on biomineralization and *** novel friction stir processing additive manufacturing route was employed to fabricate Mg-HA *** HA contents(5,10,20 wt%)were incorporated into Mg *** observation and chemical composition analysis revealed that refined Mg grains and dispersion of HA particles at micro/nanoscales were achieved in Mg-HA composites after the friction stir *** biomineralization evaluation were carried out using immersion experiments in simulated body fluid followed by mineral morphology observation and chemical composition *** wettability measurements were conducted to correlate the biomineralization *** results showed improvement in wettability and bone-like Ca/P ratio in apatite deposit on the composites compared to as-received *** addition,the increase of blood compatibility,cell viability and spreading were found in the higher HA content composites,indicating the improved ***,friction stir processed Mg-20 wt%HA composite exhibited the highest wettability and better cell adhesion among other composites due to the effect of increased HA content within Mg matrix.

关键词： Friction stir processing Magnesium alloy Hydroxyapatite additive manufacturing Biomineralization Contact angle measurement Blood compatibility Cell culture

Recent progress in bio-inspired macrostructure array materials with special wettability—from surface engineering to functional applications

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International Journal of Extreme manufacturing 2024年第1期6卷 208-256页

作者： Zhongxu Lian Jianhui Zhou Wanfei Ren Faze Chen Jinkai Xu Yanling Tian Huadong Yu School of Mechanical and Aerospace Engineering Jilin UniversityChangchun 130022People’s Republic of China Ministry of Education Key laboratory for Cross-Scale Micro and Nano manufacturing Changchun University of Science and TechnologyChangchun 130022People’s Republic of China College of Mechanical and Electrical Engineering Changchun University of Science and TechnologyChangchun 130022People’s Republic of China School of Mechanical Engineering Tianjin UniversityTianjin 300350People’s Republic of China School of Engineering University of WarwickCoventry CV47ALUnited Kingdom

Bio-inspired macrostructure array(MAA,size:submillimeter to millimeter scale)materials with special wettability(MAAMs-SW)have attracted significant research attention due to their outstanding performance in many applications,including oil repellency,liquid/droplet manipulation,anti-icing,heat transfer,water collection,and oil–water *** this review,we focus on recent developments in the theory,design,fabrication,and application of bio-inspired *** first review the history of the basic theory of special wettability and discuss representative structures and corresponding functions of some biological surfaces,thus setting the stage for the design and fabrication of bio-inspired *** then summarize the fabrication methods of special wetting MAAs in terms of three categories:additive manufacturing,subtractive manufacturing,and formative manufacturing,as well as their diverse functional applications,providing insights into the development of these ***,the challenges and directions of future research on bio-inspired MAAMs-SW are briefy *** efforts,progress,and breakthroughs from surface engineering to functional applications elaborated herein will promote the practical application of bio-inspired MAAMs-SW.

关键词： macrostructure arrays superhydrophobic 3D printing laser droplet manipulation

Microstructure Characteristics of Inconel 625 Superalloy Manufactured by Selective laser Melting

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Journal of Materials Science & Technology 2015年第9期31卷 946-952页

作者： Shuai Li Qingsong Wei Yusheng Shi Zicheng Zhu Danqing Zhang State Key laboratory of Die & Mould Technology Huazhong University of Science and Technology NTU additive Manufacture Centre Nanyang Technological University

Selective laser melting （SLM）, an additive manufacturing process, is capable of manufacturing metallic parts with complex shapes directly from computer-aided design （CAD） models. SLM parts are created on a layer-by-layer manner, making it more flexible than traditional material processing techniques, in this paper, Inconel 625 alloy, a widely used material in the aerospace industry, were chosen as the build material. Scanning electron microscopy （SEM）, electron back scattering diffraction （EBSD） and X-ray diffraction （XRD） analysis techniques were employed to analyze its microstructure. It was observed that the molten pool was composed of elongated columnar crystal, Due to the rapid cooling speed, the primary dendrite arm space was approximately 0.5 μm and the hardness of SLM state was very high （343 HV）. The inverse pole figure （IPF） indicated that the growing orientation of the most grains was 〈001〉 due to the epitaxial growth and heat conduction. The XRD results revealed that the austenite structure with large lattice distortion was fully formed. No carbides or precipitated phases were found. After heat treatment the grains grew into two microstructures with distinct morphological characters, namely, rectangular grains and limited in the molten pool, and equiaxed grains along the molten boundaries. Upon experiencing the heat treatment, MC carbides with triangular shapes gradually precipitated. The results also identified that a large number of zigzag grain boundaries were formed. In this study, the grain formation and microstructure, and the laws of the molten pool evolution were also analyzed and discussed,

关键词： Selective laser meltingNickel based superalloyTextureLattice constantZigzag grain boundary

Development of Texture Mapping Approaches for additively Manufacturable Surfaces

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Chinese Journal of Mechanical Engineering 2022年第4期35卷 125-138页

作者： Bhupesh Verma Omid Zarei Song Zhang Johannes Henrich Schleifenbaum Chair for Digital additive Production RWTH Aachen University52074 AachenGermany

manufacturing(AM)technologies have been recognized for their capability to build complex components and hence have ofered more freedom to designers for a long *** ability to directly use a computer-aided design(CAD)model has allowed for fabricating and realizing complicated components,monolithic design,reducing the number of components in an assembly,decreasing time to market,and adding performance or comfort-enhancing *** of the features that can be introduced for boosting a component functionality using AM is the inclusion of surface texture on a given *** inclusion is usually a difcult task as creating a CAD model resolving fne details of a given texture is difcult even using commercial software *** paper develops a methodology to include texture directly on the CAD model of a target surface using a patch-based sampling texture synthesis algorithm,which can be manufactured using *** for the texture generation algorithm can be either a physical sample or an image with heightmap *** heightmap information from a physical sample can be obtained by 3D scanning the sample and using the information from the acquired point *** obtaining the required inputs,the patches are sampled for texture generation according to non-parametric estimation of the local conditional Markov random feld(MRF)density function,which helps avoid mismatched features across the patch *** generating the texture,a design constraint to ensure AM producibility is considered,which is essential when manufacturing a component using,e.g.,Fused Deposition Melting(FDM)or laser Powder Bed Fusion(LPBF).The generated texture is then mapped onto the surface using the developed distance and angle preserving mapping *** implemented algorithms can be used to map the generated texture onto a mathematically defned *** paper maps the textures onto fat,curved,and sinusoidal surfaces for *** the texture m

关键词： Texture synthesis Design for additive manufacturing Image processing Textured surface generation Texture mapping

laser-based bionic manufacturing

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International Journal of Extreme manufacturing 2024年第4期6卷 62-84页

作者： Xingran Li Baoyu Zhang Timothy Jakobi Zhenglei Yu Luquan Ren Zhihui Zhang Key laboratory of Bionic Engineering(Ministry of Education) Jilin UniversityChangchunPeople's Republic of China Institute of Structured and Architected Materials Liaoning Academy of MaterialsShenyangPeople's Republic of China The University of New South Wales CanberraNorthcott DrCampbellACT 2612Australia

Over millions of years of natural evolution,organisms have developed nearly perfect structures and *** self-fabrication of organisms serves as a valuable source of inspiration for designing the next-generation of structural materials,and is driving the future paradigm shift of modern materials science and ***,the complex structures and multifunctional integrated optimization of organisms far exceed the capability of artificial design and fabrication technology,and new manufacturing methods are urgently needed to achieve efficient reproduction of biological *** one of the most valuable advanced manufacturing technologies of the 21st century,laser processing technology provides an efficient solution to the critical challenges of bionic *** review outlines the processing principles,manufacturing strategies,potential applications,challenges,and future development outlook of laser processing in bionic manufacturing *** primary manufacturing strategies for laser-based bionic manufacturing are elucidated:subtractive manufacturing,equivalent manufacturing,and additive *** progress and trends in bionic subtractive manufacturing applied to micro/nano structural surfaces,bionic equivalent manufacturing for surface strengthening,and bionic additive manufacturing aiming to achieve bionic spatial structures,are ***,the key problems faced by laser-based bionic manufacturing,its limitations,and the development trends of its existing technologies are discussed.

关键词： bionic manufacturing laser processing bionic micro/nano structural surface bionic strengthening surface bionic spatial structure

Microstructure and mechanical behavior of laser aided additive manufactured low carbon interstitial Fe_(49.5)Mn_(30)Co_(10)Cr_(10)C_(0.5)multicomponent alloy

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Journal of Materials Science & Technology 2021年第18期77卷 38-46页

作者： Y.Chew Z.G.Zhu F.Weng S.B.Gao F.L.Ng B.Y Lee G.J.Bi Singapore Institute of manufacturing Technology 73 Nanyang Drive637662Singapore School of Mechanical Aerospace Engineering Nanyang Technological University50 N any ang Avenue639798Singapore

laser aided additive manufacturing(LAAM)was used to fabricate bulk Fe_(49.5)Mn_(30)Co_(10)Cr_(10)C_(0.5)interstitial multicomponent alloy using pre-alloyed *** room temperature yield strength(σ_y),ultimate tensile strength(σ_(UTS))and elongation(ε_(UTS))were 645 MPa,917 MPa and 27.0%*** asbuilt sample consisted of equiaxed and dendritic cellular structures formed by elemental *** cellular structures together with oxide particle inclusions were deemed to strengthen the *** other contributing components include dislocation strengthening,friction stress and grain boundary *** highε_(UTS)was attributed to dislocation motion and activation of both twinning and transformation-induced plasticity(TWIP and TRIP).Tensile tests performed at-40℃and-130℃demonstrated superior tensile strength of 1041 MPa and 1267 MPa ***,almost no twinning was observed in the fractured sample tested at-40℃and-130℃.Instead,higher fraction of strain-induced hexagonal close-packed(HCP)εphase transformation of 21.2%were observed for fractured sample tested at-40℃,compared with 6.3%in fractured room temperature sample.

关键词： Multicomponent alloys laser aided additive manufacturing additive manufacturing Microstructure Mechanical property

Review of materials used in laser-aided additive manufacturing processes to produce metallic products

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Frontiers of Mechanical Engineering 2019年第3期14卷 282-298页

作者： Xiaodong NIU Surinder SINGH Akhil GARG Harpreet SINGH Biranchi PANDA Xiongbin PENG Qiujuan ZHANG Intelligent manufacturing Key laboratory of Ministry of Education Shantou University Shantou 515063 China Shantou Ruixiang Mould Co. Ltd. Jinping S&T Park Shantou 515064 China Department of Mechanical Engineering Indian Institute of Technology Ropar Rupnagar 140001 India IDMEC Institute Superior Tecnico Universidade de Lisboa 1649-004 Lisboa Portugal

Rapid prototyping (RP) or layered manufacturing (LM) technologies have been extensively used to manufacture prototypes composed mainly of plastics, polymers, paper, and wax due to the short product development time and low costs of these technologies. However, such technologies, with the exception of selective laser melting and sintering, are not used to fabricate metallic products because of the resulting poor life, short cycle, poor surface finish, and low structural integrity of the fabricated parts. The properties endowed by these parts do not match those of functional parts. Therefore, extensive research has been conducted to develop new additive manufacturing (AM) technologies by extending existing RP technologies. Several AM technologies have been developed for the fabrication of metallic objects. These technologies utilize materials, such as Ni-, A1-, and Ti-based alloys and stainless steel powders, to fabricate high-quality functional components. The present work reviews the type of materials used in laserbased AM processes for the manufacture of metallic products. The advantages and disadvantages of processes and different materials are summarized, and future research directions are discussed in the final section. This review can help experts select the ideal type of process or technology for the manufacturing of elements composed of a given alloy or material (Ni, Ti, Al, Pb, and stainless steel).

关键词： direct metal deposition laser-based manufacturing rapid manufacturing selective laser meltiiTg additive manufacturing

Novel Class of additive Manufactured NiTi-Based Hierarchically Graded Chiral Structure with Low-force Compressive Actuation for Elastocaloric Heat Pumps

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Chinese Journal of Mechanical Engineering(additive manufacturing Frontiers) 2023年第2期2卷 54-65页

作者： Xin Peng Luhao Yuan Donghua Dai Yu Liu Dongya Li Dehui Zhu Ziyu Fang Chenglong Ma Dongdong Gu Meiping Wu Jiangsu Key laboratory of Advanced Food manufacturing Equipment&Technology School of Mechanical EngineeringJiangnan UniversityWuxi214122China Jiangsu Province Engineering Research Center of Micro-Nano additive and subtractive manufacturing Wuxi214122China College of Material Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing210016China Sino-French Engineer School Nanjing University of Science and TechnologyNanjing210094China

Elastocaloric refrigeration is the most promising green solid-state refrigeration technology to replace conventional vapor compression *** development direction of the elastocaloric component that acts as a key part of the elastocaloric refrigeration system contains a large elastocaloric effect,low stress hysteresis,high heat exchange performance,and small driving *** first two indices can be realized by material modification;however,the last two are more dependent on a novel porous structure ***,the conventional porous structure is confronted with some critical challenges,including inhomogeneous stress,a significant hysteresis area,and deformation instability under the alternating cyclic *** this study,a NiTi-based elastocaloric structure model with chirality feature and gradient design as innovative elements was presented,bio-inspired by the structure of the plant tendrils.A quantitative optimization for the NiTi-based elastocaloric structure was performed using the finite element analysis(FEA)*** and martensite volume fraction(MVF)fields during the loading and unloading processes were predicted and *** simulated results indicated that increasing the thickness gradient g_(1) of the strip or decreasing the diameter gradient g_(2) of the structure was beneficial to achieving more homogeneous strain and martensite distribution,simultaneously with higher energy storage efficiency and specific surface *** addition,these NiTi-based chiral structures with different structural parameters were fabricated by laser powder bed fusion(LPBF).At the optimized structure parameters of g_(1)=2 and g_(2)=1.11,the LPBF-fabricated NiTi-based chiral structure could achieve an adiabatic temperature change ΔT_(ad) of 2.3 K,driving force of as low as 149.11 N,and|ΔT_(ad)/F|of as high as 15.42 K/kN at a recoverable compressive strain of 10%.

关键词： laser powder bed fusion NiTi alloys Elastocaloric effect Chiral structure

Study on Welding-Bead Bonding Strength of laser-Stacking Copper-Aluminum Heterogeneous Electrode Plates

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Journal of Mechanics Engineering and Automation 2021年第5期11卷 121-134页

作者： Shang-Wu Tsai Shih-Kai Chien Kun-Tso Chen Tsung-Ying Tsai Wen-Cheng Tseng Computer aided Engineering Center Automotive Research and Testing Center(ARTC)Lukang TownshipChanghua County 50544Taiwan laser and additive manufacturing Technology Center Industrial Technology Research Institute(ITRI)Tainan City 73445Taiwan Elite Crown Software and Consulting Co. Ltd.San Chung City Taipei County 24143Taiwan

In this paper,two types of copper-aluminum heterogeneous electrode plates are stacked and the finite element analysis(FEA)models of two different laser welding conditions are built by using SYSWELD welding simulation software to calculate the depth of the welding bead and the temperature distribution of the welding ***,the residual stress analysis data of the welded area are exported and the residual stress is applied to the welded specimen for CAE analysis to ensure that the welding bonding strength meets the design target of a shear force of 500 N or *** copper-aluminum laser-stacking simulation technique in this paper can be applied to the manufacturing of copper-aluminum heterogeneous laser-welded electrodes and series-connected electrodes of automotive lithium-ion power battery modules,providing an effective analysis method for welding bonding-strength.

关键词： Copper-aluminum heterogeneous laser welding simulation welding bonding strength analysis finite element method

Study of the intrinsic mechanisms of nickel additive for grain refinement and strength enhancement of laser aided additively manufactured Ti–6Al–4V

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International Journal of Extreme manufacturing 2022年第3期4卷 132-148页

作者： Shang Sui Youxiang Chew Fei Weng Chaolin Tan Zhenglin Du Guijun Bi Singapore Institute of manufacturing Technology A∗STAR73 Nanyang Drive637662Singapore Institute of Intelligent manufacturing GDASGuangzhou 510070People’s Republic of China

It is well-known that grain refiners can tailor the microstructure and enhance the mechanical properties of titanium alloys fabricated by additive manufacturing(AM). However, the intrinsic mechanisms of Ni addition on AM-built Ti–6Al–4V alloy is not well established. This limits its industrial applications. This work systematically investigated the influence of Ni additive on Ti–6Al–4V alloy fabricated by laser aided additive manufacturing(LAAM). The results showed that Ni addition yields three key effects on the microstructural evolution of LAAM-built Ti–6Al–4V alloy.(a) Ni additive remarkably refines the prior-β grains, which is due to the widened solidification range. As the Ni addition increased from 0 to 2.5 wt. %, the major-axis length and aspect ratio of the prior-β grains reduced from over 1500 μm and 7 to 97.7 μm and1.46, respectively.(b) Ni additive can discernibly induce the formation of globular α phase,which is attributed to the enhanced concentration gradient between the β and α phases. This is the driving force of globularization according to the termination mass transfer theory. The aspect ratio of the α laths decreased from 4.14 to 2.79 as the Ni addition increased from 0 to2.5 wt. %.(c) Ni as a well-known β-stabilizer and it can remarkably increase the volume fraction of β phase. Room-temperature tensile results demonstrated an increase in mechanical strength and an almost linearly decreasing elongation with increasing Ni addition. A modified mathematical model was used to quantitatively analyze the strengthening mechanism. It was evident from the results that the α lath phase and the solid solutes contribute the most to the overall yield strength of the LAAM-built Ti–6Al–4V–x Ni alloys in this work. Furthermore, the decrease in elongation with increasing Ni addition is due to the deterioration in deformability of the β phase caused by a large amount of solid-solution Ni atoms. These findings can accelerate the development of additively manufacture

关键词： Ni addition microstructure refinement laser aided additive manufacturing titanium alloys strengthening mechanism