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激光定向能量沉积Al-Mg-Sc-Zr修复5083-H112铝合金的组织和性能

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材料工程 2024年第2期52卷 40-49页

作者：徐荣王文军祝弘滨李瑞迪折洁袁铁锤中南大学粉末冶金国家重点实验室长沙410083 浙江力博实业股份有限公司浙江绍兴312000 中车工业研究院有限公司北京100070

激光定向能量沉积增材修复技术具有时间短、效率高、成本低、力学性能好等优点,具有很大的发展潜力。采用Al-7.5Mg-0.3Sc-0.28Zr作为修复材料对轨道交通用5083-H112铝合金进行激光修复实验,得到了致密、无缺陷的修复试样,并对其组织和... 详细信息

激光定向能量沉积增材修复技术具有时间短、效率高、成本低、力学性能好等优点,具有很大的发展潜力。采用Al-7.5Mg-0.3Sc-0.28Zr作为修复材料对轨道交通用5083-H112铝合金进行激光修复实验,得到了致密、无缺陷的修复试样,并对其组织和性能进行研究,探讨了激光修复铝合金的可行性。结果表明,熔合线附近过渡区可划分为修复区、部分熔化区、热影响区和母材。修复区为完全等轴晶,由平均晶粒尺寸为4.95μm的细晶带和18.34μm的粗晶区组成。从修复区到部分熔化区再到热影响区的过渡区域,Al元素含量逐渐升高,Mg元素含量逐渐下降,硬度逐渐下降,修复后母材未被软化。由于激光增材制造技术的快速凝固,在熔合线附近的细晶带有较大的应力集中,由于较小的热输入在部分熔化区、热影响区的残余应力较小。修复试样的屈服强度为(152±2)MPa,为母材的89.4%;抗拉强度为(305±5)MPa,为母材抗拉强度的100%;伸长率为(15.5±0.5)%,为母材的85.2%;断裂发生在强度较弱的母材。高性能的激光修复铝合金是可实现的,具有广泛的应用前景。

关键词： 5083-H112 激光定向能量沉积激光修复铝合金过渡区显微组织拉伸性能

A Comparative Study on the Microstructure and Properties of ITO Targets and Thin Films Prepared from Two Different Powders

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Acta Metallurgica Sinica(English Letters) 2021年第5期34卷 675-693页

作者： Fangsheng Mei tiechui yuan Ruidi Li Jingwei Huang Powder Metallurgy Research Institute Central South UniversityChangsha410083China Science and Technology on High Strength Structural Materials Laboratory Central South UniversityChangsha410083China

With the rapid development of indium tin oxide(ITO)in the electronic display industry,choosing which raw powders to prepare high-quality ITO targets has always been a controversial *** the work,in order to clearly understand the effect of the raw powders on the microstructure and properties of ITO targets and thin films,tin-doped indium oxide(dITO)and In_(2)O_3-SnO_(2)mixed(mITO)powders were chosen to prepare ITO targets for depositing the films and a comparative study on their microstructure and properties was *** is found that,(1)dITO targets possess a higher solid solubility of tin in indium oxide and more uniform elemental distribution,while there are a higher density,a finer grain size and a higher mass ratio of In_(2)O_3 to SnO_(2)for the mITO targets;(2)dITO films with more coarser columnar grains and a rougher surface prefer to grow along the[100]direction in an Ar atmosphere;(3)the conductive property of ITO films only depends on the doping amount of tin and is independent of the raw powders and the preparation process of the target source;(4)dITO films possess the superior optical property and narrower optical band gap;(5)the etching property of mITO films is superior to that of dITO films due to the lower solid solubility of tin in indium oxide.

关键词： Tin-doped indium oxide In_(2)O_3-SnO_(2) mixed powder Solid solubility of tin in indium oxide Photoelectric property Etching property

Microstructure and Mechanical Properties of TiC-Reinforced Al–Mg–Sc–Zr Composites Additively Manufactured by Laser Direct Energy Deposition

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Acta Metallurgica Sinica(English Letters) 2022年第3期35卷 411-424页

作者： Rong Xu Ruidi Li tiechui yuan Hongbin Zhu Ping Li State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083.China CRRC Industrial Academy Co. LtdBeijing 100070China

In order to refine the microstructure and improve the performance of direct energy deposited(DED)additively manufactured Al–Mg–Sc–Zr alloy,TiC-modified Al–Mg–Sc–Zr composites were prepared by DED and the effect of TiC content on the microstructure and performance was *** the absence of TiC particle,the microstructure of Al–Mg–Sc–Zr alloy prepared by DED consisted of fine grains with average size of 8.36μm,and well-dispersed nano-Al;(Sc,Zr)particles inside the grains and Mg;Si phase along the grain *** the addition of 1 wt%TiC,the microstructure of TiC/Al–Mg–Sc–Zr prepared by DED became finer apparently compared with that without TiC;while the further increase of TiC content to 3 wt%,the microstructure of TiC/Al–Mg–Sc–Zr prepared by DED became coarser with appearance of a new kind of needle-like(Ti,Zr);Si;***,the addition of TiC decreased the porosity of Al–Mg–Sc–Zr prepared by ***,after the addition of TiC,the tensile strength increased from 283.25 MPa to 344.98–361.51 MPa,and the elongation increased from 3.61%to 9.58–14.10%.The potential mechanism of the microstructure evolution and strength improvement was *** research will provide new insights into the available metal matrix composites by laser additive manufacturing(LAM).

关键词： Laser additive manufacturing Aluminum matrix composites Mechanical property Microstructure

Microstructure and mechanical properties of Al-Si-Ni coating on Cu-Cr substrate prepared by multi-permeation and friction stir processing

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Nano Materials Science 2019年第3期1卷 224-228页

作者： Yin Wang Ruidi Li tiechui yuan State Key Laboratory of Powder Metallurgy Shenzhen Institute of Central South University Central South University

The surface of copper-chromium alloy was processed by Al-Si-Ni multi-permeation and friction stir processing,and the microstructure and mechanical properties of the surface layer were tested by scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS),microhardness tester and friction testing *** results show that Al,Si and Ni elements are fully permeated into the surface of copper-chromium alloy after multielement co-infiltration and friction stir *** the observation of the microstructures,we found that the reticular structure is fragmented and distributed in the stir zone *** becomes finer and grains *** micro hardness of the copper-chromium alloy increased to 129 HV,44.9%higher than that of the original *** main reasons of microhardness enhancement are solid solution strengthening,fine grains strengthening and dispersion *** friction test results show that the friction coefficient is basically stable at 0.69 and the wear mass is only 0.0017 g after 10 min of friction *** improvement of wear resistance was attributed to the increase of microhardness of the alloy surface.

关键词： Copper-chromium alloy Al-Si-Ni multi-permeation Friction stir processing Microstructure Mechanical properties

Microstructure and Mechanical Properties of Selective Laser Melted Al–2.51Mn–2.71Mg–0.55Sc–0.29Cu–0.31Zn Alloy Designed by Supersaturated Solid Solution

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Acta Metallurgica Sinica(English Letters) 2022年第3期35卷 354-368页

作者： Minbo Wang Ruidi Li tiechui yuan Haiou Yang Pengda Niu Chao Chen State Key Laboratory of Powder Metallurgy Shenzhen Research Institute of CSUCentral South UniversityChangsha 410083China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072China

Selective laser melting(SLM)of aluminium alloys for lightweight application is arousing widespread interest,but the available alloy compositions are limited due to unsatisfactory mechanical *** rapid solidifi cation of SLM provides a pathway to design a novel alloy composition with extended *** strategy is demonstrated by an additively manufactured novel Al–2.51 Mn–2.71 Mg–0.55 Sc–0.29 Cu–0.31 Zn alloy with the supersaturated solid solution in the present *** microstructure of as-build sample is characterized with multi-modal grains with the fi ne equiaxed grain(FEG,~800 nm)at molten pool boundaries,coarse equiaxed grain(CEG,~2μm)and columnar dendrites(CD,~4μm)inside the molten pool,which relates to the precipitations type and *** is observable that Al 3(Sc,Zr)precipitation particles with the size of~50 nm are dispersed in the FEG zone,while the interior of CEG shows no Al3(Sc,Zr)particle which only exists at the CEG *** of FEG,CEG or CD,the slender Al6 Mn precipitation with the length of~500 nm is distributed along the grain ***,a lot of vacancies and thickness fringes are detected in the FEG zone,which confi rms the supersaturated solid solution in laser rapid solidifi *** ultimate tensile strength and yield strength of the as-printed sample are~380 MPa and~330 MPa,respectively,with elongation~14%,which increase to~440 MPa and~410 MPa with a reduction of elongation to~9%after heat treatment.

关键词： Selective laser melting Al–2.51Mn–2.71Mg–0.55Sc–0.29Cu–0.31Zn Supersaturated solid solution Microstructure Mechanical property Precipitation

粉末冶金Ti-Al-Mo-Cr-Fe-B体系的组织与力学性能

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中南大学学报（自然科学版） 2024年第8期55卷 2961-2969页

作者：方浩煜李健徐学军周翔幸李瑞迪袁铁锤伍秋美中南大学粉末冶金国家重点实验室湖南长沙410083 杭州屹通新材料股份有限公司浙江杭州311600 江西天奇汽车零部件有限公司江西萍乡337000

采用粉末冶金技术制备Ti-Al-Mo-Cr-Fe-B合金,通过扫描电镜(SEM)、X射线衍射(XRD)、准静态拉伸测试和显微硬度测试等方法研究Mo、Cr、Fe含量对钛合金显微组织、烧结致密化和力学性能的影响。研究结果表明,所有合金均由α相、β相和金属... 详细信息

采用粉末冶金技术制备Ti-Al-Mo-Cr-Fe-B合金,通过扫描电镜(SEM)、X射线衍射(XRD)、准静态拉伸测试和显微硬度测试等方法研究Mo、Cr、Fe含量对钛合金显微组织、烧结致密化和力学性能的影响。研究结果表明,所有合金均由α相、β相和金属间化合物组成,Mo、Cr、Fe的添加降低了钛合金体系在缓慢冷却过程中形成α相的倾向,增加了β相和金属间化合物的比例。其中,Ti-3A1-1.5Mo-4Cr-1Fe-0.1B的性能最优,其致密度、显微硬度、极限抗拉强度和伸长率分别为(99.29±0.06)%、438.40±13.69(HV)、(1124±119)MPa和(1.93±0.04)%。所有合金均以脆性断裂为主,其力学性能与残余孔隙率密切相关,孔隙率越高,合金强度和塑性越低。合金的致密化主要受到Cr、Fe原子快速扩散带来的综合影响,即快速扩散促进烧结致密化的积极效果与快速扩散导致孔隙形成的消极效果之间的交互作用。

关键词：钛合金粉末冶金混合元素显微组织力学性能

退火温度对粉末冶金Ti-2Mn-2Sn-0.1B合金组织和力学性能的影响

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粉末冶金材料科学与工程 2024年第3期29卷 246-254页

作者：方浩煜伍秋美袁铁锤中南大学粉末冶金国家重点实验室长沙410083

粉末冶金工艺在生产成本、成分设计自由度等方面具有显著优势,是制造低成本高性能钛合金的有效途径。本文采用粉末冶金技术制备Ti-2Mn-2Sn-0.1B合金,研究退火温度对合金组织和力学性能的影响。结果表明:Ti-2Mn-2Sn-0.1B合金均由α、β和... 详细信息

粉末冶金工艺在生产成本、成分设计自由度等方面具有显著优势,是制造低成本高性能钛合金的有效途径。本文采用粉末冶金技术制备Ti-2Mn-2Sn-0.1B合金,研究退火温度对合金组织和力学性能的影响。结果表明:Ti-2Mn-2Sn-0.1B合金均由α、β和TiB相组成,与未退火合金相比,750℃退火合金中β相含量增加,850℃退火合金中析出片状和针状α′相,950℃退火合金中α相和β相呈层状分布。合金均以韧性断裂为主,其中950℃退火合金力学性能较好,层状分布的α相与β相能够提供良好的强化和硬化效果,显微硬度(HV)、极限抗拉强度和伸长率分别为335±16、(803±4)MPa和(11.3±2.2)%。

关键词：粉末冶金钛合金显微组织力学性能热处理

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蒸馏-快冷法与气雾化法制备铅粉对比研究

湖南有色金属 2024年第3期40卷 47-50页

作者：徐学军王文军高和欣袁铁锤蔺仕琦邹亮中山市新泰兴粉末冶金有限公司广东中山528400 中南大学粉末冶金国家重点实验室湖南长沙410083 邵阳学院高效动力系统智能制造湖南省重点实验室湖南邵阳422000

本研究以铅含量大于0.99994的铅锭为试验原料,分别采用蒸馏-快冷法和气雾化法制备铅粉,研究两类方法对制备铅粉的影响,研究结果表明:蒸馏-快冷法由于采用高温减压蒸馏制备,能实现Fe、Cu、Sn、Ag、Al、Ni的有效除杂,制备的铅粉形貌无规... 详细信息

本研究以铅含量大于0.99994的铅锭为试验原料,分别采用蒸馏-快冷法和气雾化法制备铅粉,研究两类方法对制备铅粉的影响,研究结果表明:蒸馏-快冷法由于采用高温减压蒸馏制备,能实现Fe、Cu、Sn、Ag、Al、Ni的有效除杂,制备的铅粉形貌无规则但粒度较小,1100℃下铅粉粒度呈正态分布,Dv(50)为4.89μm,但继续升高温度会加剧铅粉团聚;气雾化法对杂质金属无除杂效果,制备的铅粉粒度较大但形貌趋于球形,在炉温480℃、氮气雾化压力为4.0 MPa条件下获得的铅粉粒度呈正态分布,Dv(50)为26.1μm。

关键词：蒸馏-快冷法气雾化法铅粉除杂

CuAlMn合金粉末激光选区熔化成形组织与性能研究

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中南大学学报（自然科学版） 2020年第11期51卷 3110-3118页

作者：熊熠郑聃袁铁锤李瑞迪中南大学粉末冶金国家重点实验室湖南长沙410083

利用激光选区熔化技术将CuAlMn合金粉末打印成形,采用金相显微镜观察、扫描电子显微镜观察、X射线衍射分析、电子背散射衍射测试及显微硬度测量等手段研究成形试样的组织与性能。研究结果表明:当激光能量密度输入从21.9 J/mm^3增加到87.... 详细信息

利用激光选区熔化技术将CuAlMn合金粉末打印成形,采用金相显微镜观察、扫描电子显微镜观察、X射线衍射分析、电子背散射衍射测试及显微硬度测量等手段研究成形试样的组织与性能。研究结果表明:当激光能量密度输入从21.9 J/mm^3增加到87.5 J/mm^3时,激光选区熔化成形CuAlMn试样的密度先增大后减小;试样的显微硬度随着激光能量密度的增加而降低,这是因为粉末和成形试样都为(DO3+L21)晶体结构的β相,激光能量密度增加导致Mn元素大量挥发,增强了Al原子和Mn原子发生晶格外扩散,使得母相固溶度降低,导致试样的硬度减小。微观组织形貌显示试样建造方向和水平方向有较大区别,建造方向熔池顶端直径为200μm左右,EBSD分析表明试样在建造方向拥有很强的织构,其织构指数和织构强度分别为3.691和3.124。

关键词：激光选区熔化技术 CuAlMn合金工艺参数显微硬度织构