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Selective Laser Melting of Al-7Si-0.5Mg-0.5Cu:Effect of Heat Treatment on Microstructure Evolution,Mechanical Properties and Wear Resistance

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Acta Metallurgica Sinica(English Letters) 2022年第3期35卷 389-396页

作者： Pei Wang Sijie Yu Jaskarn Shergill Anil Chaubey Jürgen Eckert konda gokuldoss prashanth Sergio Scudino Additive Manufacturing Institute College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen 518060China Institute for Complex Materials IFW DresdenHelmholtzstraBe 2001069 DresdenGermany Institute of Minerals and Materials Technology(IMMT) Bhubaneshwar 751013OrissaIndia Erich Schmid Institute of Materials Science Austrian Academy of SciencesJahnstraBe 128700 LeobenAustria Department of Materials Science Chair of Materials PhysicsMontanuniversitat LeobenJahnstraBe 128700 LeobenAustria Department of Mechanical and Industrial Engineering Tallinn University of TechnologyEhitajete tee 519086 TallinnEstonia CBCMT School of Mechanical EngineeringVellore Institute of TechnologyVellore.Tamil Nadu 632014India Adjunct With National University of Science and Technology aMISi Sa Leninsky Prosp..4.119049 MoscowRussia

Al-7Si-0.5Mg-0.5Cu alloy specimens have been fabricated by selective laser melting(SLM).In this study,the effects of solution treatment,quenching,and artifi cial aging on the microstructural evolution,as well as mechanical and wear properties,have been investigated.The as-prepared samples show a heterogeneous cellular microstructure with two different cell sizes composed ofα-Al and Si phases.After solution-treated and quenched(SQ)heat treatment,the cellular microstructure disappears,and coarse and lumpy Si phase precipitates and a rectangular Cu-rich phase were observed.Subsequent aging after solution-treated and quenched(SQA)heat treatment causes the formation of nanosized Cu-rich precipitates.The asprepared SLMs sample has good mechanical properties and wear resistance(compressive yield strength:215±6 MPa and wear rate 2×10^(-13)m^(3)/m).The SQ samples with lumpy Si particles have the lowest strength of 167±13 MPa and the highest wear rate of 6.18×10^(1-13)m^(3)/m.The formation of nanosized Cu-rich precipitates in the SQA samples leads to the highest compressive yield strength of 233±6 MPa and a good wear rate of 5.06×10^(-13)m^(3)/m.

关键词： Selective laser melting Al-Si-Cu-Mg alloy Heat treatment Microstructure Mechanical properties Wear properties

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Hierarchical microstructures and strengthening mechanisms of nano-TiC reinforced CoCrFeMnNi high-entropy alloy composites prepared by laser powder bed fusion

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Journal of Materials Science & Technology 2023年第5期136卷 245-259页

作者： Hongyu Chen Konrad Kosiba Tiwen Lu Ning Yao Yang Liu Yonggang Wang konda gokuldoss prashanth Challapalli Suryanarayana Key Laboratory of Impact and Safety Engineering of Ministry of Education of China Ningbo UniversityNingbo 315211China Leibniz Institute for Solid State and Materials Research Dresden Institute for Complex MaterialsHelmholtzstr.2001069 DresdenGermany Key Laboratory of Pressure Systems and Safety Ministry of EducationEast China University of Science and TechnologyShanghai 200237China Department of Mechanical and Industrial Engineering Tallinn University of Technology19086 TallinnEstonia Erich Schmid Institute of Materials Science Austrian Academy of SciencesA-8700 LeobenAustria CBCMT Vellore Institute of TechnologyVellore 632014Tamil NaduIndia Department of Mechanical and Aerospace Engineering University of Central FloridaOrlandoFL 32816-2450United States

High entropy alloys(HEAs)have recently received extensive attention due to their appealing mechani-cal performance given their simple phase formation.This study utilized laser powder bed fusion(LPBF)to fabricate high-performance HEA components.By processing respective powder blends,LPBF enabled the fabrication of stronger composites with a uniformly distributed reinforcing phase.Here,the impact of varying content of nano-scale TiC(1-3 wt%)particles for strengthening the CoCrFeMnNi HEA was ex-plored.The microstructural features and mechanical properties of the HEA composites were investigated in detail.The introduction of nano-scale TiC into the HEA matrix encouraged the development of cross-scale hierarchical microstructure and eliminated the formation of oxide inclusions.Incorporating more nano-TiC led to a higher dislocation density and more refined microstructure in the HEA composites,whereas it posed little influence on the anisotropy of the HEA matrix which typically featured atexture along the building direction.With an optimized content of nano-TiC(1-2 wt%),the strength-ductility trade-offcan be overcome by exploiting multiple strengthening mechanisms encompassing grain boundary strengthening,solid solution strengthening,Orowan strengthening,and dislocation strengthen-ing.The HEA composites showed a favored strength-ductility combination with a yield strength of 748-882 MPa,ultimate tensile strength of 931-1081 MPa,and fracture elongation of 23%-29%.This study demonstrates that the introduction of nano-scale TiC is an effective way to simultaneously improve the strength and ductility of additively manufactured HEA materials.

关键词： Additive manufacturing Laser powder bed fusion High entropy alloy Microstructure Mechanical property

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选区激光熔化成形颗粒增强铝基复合材料综述

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Transactions of Nonferrous Metals Society of China 2020年第8期30卷 2001-2034页

作者：王沛 Jürgen ECKERT konda-gokuldoss prashanth 吴明伟 Ivan KABAN 席丽霞 Sergio SCUDINO 深圳大学增材制造研究所深圳518060 Institute for Complex Materials IFW DresdenD-01069 DresdenGermany Erich Schmid Institute of Materials Science Austrian Academy of SciencesA-8700 LeobenAustria Department of Materials Science Montanuniversitat LeobenA-8700 LeobenAustria Department of Mechanical and Industrial Engineering Tallinn University of Technology19086 TallinnEstonia CBCMT School of Mechanical EngineeringVellore Institute of TechnologyVellore-632014Tamil NaduIndia 台北科技大学材料及资源工程系台北10608 南京航空航天大学材料科学与技术学院南京210016

选区激光熔化(SLM)是一种新兴逐层增材制造技术,能够生成具有三维复杂结构的高性能构件。颗粒增强铝基复合材料(PAMCs)由于结合铝基体和增强相的优异特性在很多领域被认为是一种重要材料。基于SLM和PAMCs的综合优势,新型SLMPAMCs在近年... 详细信息

选区激光熔化(SLM)是一种新兴逐层增材制造技术,能够生成具有三维复杂结构的高性能构件。颗粒增强铝基复合材料(PAMCs)由于结合铝基体和增强相的优异特性在很多领域被认为是一种重要材料。基于SLM和PAMCs的综合优势,新型SLMPAMCs在近年来被陆续开发和研究。因而,本文总结当前有关SLMPAMCs的研究进展。首先,着重分析SLM PAMCs的凝固行为。其次,对高性能SLM PAMCs设计和制造中涉及的重要问题进行全面的讨论,其中包括增强相的选择、工艺参数对成形和微观结构的影响以及缺陷演变和相调控。第三,对SLM PAMCs的性能和增强机制进行系统讨论。最后,对高性能SLM PAMCs未来发展方向提出建设性的观点。

关键词：选区激光熔化铝基复合材料凝固行为显微组织性能

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Selective Laser Melting of Commercially Pure Silicon

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Journal of Wuhan University of Technology(Materials Science) 2022年第6期37卷 1155-1165页

作者：赖周艺 GUO Ting ZHANG Shengting KOLLO Lauri ATTAR Hooyar 王智 prashanth konda gokuldoss Sino-German Robotics School Shenzhen Institute of Information TechnologyShenzhen 518172China School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou 510641China Centre for Advanced Materials Processing and Manufacturing School of Mechanical and Mining EngineeringThe University of QueenslandBrisbaneQueensland 4072Australia Department of Mechanical and Industrial Engineering Tallinn University of TechnologyTallinn 19086Estonia Erich Schmid Institute of Materials Science Austrian Academy of SciencesLeoben A-8700Austria Centre for Biomaterials Cellular and Molecular TheranosticsVellore Institute of TechnologyVelloreTamil Nadu 632014India

Selective laser melting(SLM)or Laser-based powder bed fusion(LBPF)is gaining much attention for the fabrication of novel materials with complex shapes,improved functionalities,and properties.An attempt has been made to fabricate hard and brittle silicon via SLM in the absence of any cracks.Two different powder batches were used,where one of the powder batches has 0.3wt%Fe and the other batch with 0.02wt%Fe.The parameter optimization process shows that the SLM Si samples were successfully fabricated from the powders with the minor addition of Fe.The deliberate addition of Fe facilitates heterogeneous nucleation of Si and aids in absorbing the laser energy beam more efficiently.SLM Si samples with 98.5%theoretical density were fabricated with a hardness of around 10.65±40 GPa.The experimental results show that SLM can successfully fabricate Si without cracks and with near theoretical density(of 99%)and complex shapes,which opens their use in wider industrial applications.

关键词： additive manufacturing selective laser melting silicon heterogeneous nucleation

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Effect of Powder Particle Shape on the Properties of In Situ Ti–TiB Composite Materials Produced by Selective Laser Melting

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Journal of Materials Science & Technology 2015年第10期31卷 1001-1005页

作者： Hooyar Attar konda G.prashanth Lai-Chang Zhang Mariana Calin Ilya V.Okulov Sergio Scudino Chao Yang Jürgen Eckert School of Engineering Edith Cowan University IFW Dresden Institute for Complex Materials TU Dresden Institute of Materials Science National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials South China University of Technology

This work studied the preparation of starting powder mixture influenced by milling time and its effect on the particle morphology （especially the shape） and, consequently, density and compression properties of in situ Ti-TiB composite materials produced by selective laser melting （SLM） technology. Starting powder composite system was prepared by mixing 95 wt% commercially pure titanium （CP-Ti） and 5 wt% titanium diboride （TiB2） powders and subsequently milled for two different times （i.e. 2 h and 4 h）. The milled powder mixtures after 2 h and 4 h show nearly spherical and irregular shape, respectively. Subsequently, the resultant Ti-5 wt% TiB2 powder mixtures were used for SLM processing. Scanning electron microscopy image of the SLM-processed Ti-TiB composite samples show needle-shape TiB phase distributed across the Ti matrix, which is the product of an in-situ chemical reaction between Ti and TiB2 during SLM. The Ti-TiB composite samples prepared from 2 h and 4 h milled Ti-TiB2 powders show different relative densities of 99.5% and 95.1%, respectively. Also, the compression properties such as ultimate strength and compression strain for the 99.5% dense composite samples is 1421 MPa and 17.8%, respectively, which are superior to those （883 MPa and 5.5%, respectively） for the 95.1% dense sample. The results indicate that once Ti and TiB2 powders are connected firmly to each other and powder mixture of nearly spherical shape is obtained, there is no additional benefit in increasing the milling time and, instead, it has a negative effect on the density （i.e. increasing porosity level） of the Ti-TiB composite materials and their mechanical properties.

关键词： Selective laser melting In situ Ti-TiB composite Powder shape Density Mechanical properties

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