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Ballistic performance of titanium-based layered composites made using blended elemental powder metallurgy and hot isostatic pressing

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DEFENCE TECHNOLOGY 2024年第9期39卷 1-14页

作者： Markovsky, Pavlo Janiszewski, Jacek Savvakin, Dmytro Stasyuk, Oleksandr Fikus, Bartosz Samarov, Victor Ellison, Vianey Prikhodko, Sergey, V NAS Ukraine GV Kurdyumov Inst Met Phys 36Academician Vernadsky Blvd UA-03142 Kyiv Ukraine Jaroslaw Dabrowski Mil Univ Technol 2Gen Sylwester Kaliski Str PL-00908 Warsaw 46 Poland Synertech Inc 11711 Monarch St Garden Grove Los Angeles CA 92841 USA Univ Calif Los Angeles Dept Mat Sci & Engn Los Angeles CA 90095 USA

Metal matrix composites tiles based on Ti-6Al-4V (Ti64) alloy, reinforced with 10, 20, and 40 (vol%) of either TiC or TiB particles were made using press-and-sinter blended elemental powder metallurgy (BEPM) and then bonded together into 3-layer laminated plates using hot isostatic pressing (HIP). The laminates were ballistically tested and demonstrated superior performance. The microstructure and properties of the laminates were analyzed to determine the effect of the BEPM and HIP processing on the ballistic properties of the layered plates. The effect of porosity in sintered composites on further diffusion bonding of the plates during HIP is analyzed to understand the bonding features at the interfaces between different adjacent layers in the laminate. Exceptional ballistic performance of fabricated structures was explained by a significant reduction in the residual porosity of the BEPM products by their additional processing using HIP, which provides an unprecedented increase in the hardness of the layered composites. It is argued that the combination of the used two technologies, BEPM and HIP is principally complimentary for the materials in question with the abilities to solve the essential problems of each used individually.

关键词： Metal matrix composites Powder metallurgy titanium hydride powder Master alloy titanium carbide titanium boride Hot isostatic pressing Ballistic tests TI-6AL-4V ALLOY TIB COMPOSITES ARMOR STEELS BEHAVIOR MICROSTRUCTURE PROJECTILES AEROSPACE

Biological,antibacterial activities and electrochemical behavior of borided commercially pure titanium in BSA-containing PBS

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Transactions of Nonferrous Metals Society of China 2020年第4期30卷 944-957页

作者： Adib EBRAHIMI Hamid ESFAHANI Omid IMANTALAB Arash FATTAH-ALHOSSEINI Department of Materials Engineering Bu-Ali Sina UniversityHamedan 65178-38695Iran

The effects of boride coating on the bioactivity, antibacterial activity, and electrochemical behavior of commercially pure titanium(CP-Ti) in phosphate buffer solution(PBS) with bovine serum albumin(BSA) were studied. The grazing incidence X-ray diffraction(GIXRD) pattern confirmed the formation of a Ti B/Ti B2 coating via boriding process. Scanning electron microscopy(SEM) observation indicated that the Ti B2 cross-linked particles covered the Ti B whiskers. Water contact angle measurements revealed that boriding led to the formation of a surface with intermediate water affinity. Potentiodynamic polarization(PDP) assays demonstrated that the Ti B/Ti B2 coating had acceptable passivation behavior in BSA-containing PBS. Electrochemical impedance spectroscopy(EIS) measurements revealed that the passivation behavior of the CP-Ti and the borided samples was improved by increasing exposure time. Based on the Mott-Schottky(M-S) tests, it was realized that the charge carriers of passive films of both samples decreased with increasing exposure time in BSA-containing PBS. The bioactivity test results in a simulated body fluid showed that the Ti B/Ti B2 coating switched the CP-Ti from bioinert to bioactive material. Finally, the antibacterial activity test of the Ti B/Ti B2 coating against Escherichia coli and Staphylococcus aureus indicated 99% antibacterial activity.

关键词： electrochemical behavior boriding BSA-containing PBS passive film titanium boride

Solid fraction evolution characteristics of semi-solid A356 alloy and in-situ A356–TiB_2 composites investigated by differential thermal analysis

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International Journal of Minerals,Metallurgy and Materials 2015年第4期22卷 389-394页

作者： S.Deepak Kumar A.Mandal M.Chakraborty School of Mechanical Sciences Indian Institute of Technology Bhubaneswar School of Minerals Metallurgical and Materials Engineering Indian Institute of Technology Bhubaneswar

The key factor in semi-solid metal processing is the solid fraction at the forming temperature because it affects the microstructure and mechanical properties of the thixoformed components. Though an enormous amount of data exists on the solid fraction-temperature re- lationship in A356 alloy, information regarding the solid fraction evolution characteristics of A356-TiB2 composites is scarce. The present article establishes the temperature-solid fraction correlation in A356 alloy and A356-xTiB2 （x = 2.5wt% and 5wt%） composites using dif- ferential thermal analysis （DTA）. The DTA results indicate that the solidification characteristics of the composites exhibited a variation of 2℃ and 3℃ in liquidus temperatures and a variation of 3℃ and 5℃ in solidus temperatures with respect to the base alloy. Moreover, the eutectic growth temperature and the solid fraction（fs） vs. temperature characteristics of the composites were found to be higher than those of the base alloy. The investigation revealed that in-situ formed TiB2 particles in the molten metal introduced more nucleation sites and reduced undercooling.

关键词： particle reinforced composites aluminum alloys titanium boride casting solid fraction differential thermal analysis

High-temperature dielectric and microwave absorption performances of TiB2/Al2O3 ceramics prepared by spark plasma sintering

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Science China(Technological Sciences) 2021年第6期64卷 1264-1275页

作者： LIU XiongZhang LUO Hui LI YinRui CHEN Fu LIU JieLing YANG WenTao WANG Xian GONG RongZhou School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China School of Information Science and Engineering Wuhan University of Science and TechnologyWuhan 430081China

TiB_(2)/Al2O3 ceramics reinforced with Mg O are prepared by spark plasma sintering(SPS).The dielectric and microwave(MW)absorption properties are *** results indicate that both the commercial TiB_(2)(C-TiB_(2))content and preparing temperature play important roles in the dielectric ***,TiB_(2)/Al2O3 composite shows the best MW absorption property when the C-TiB_(2)content and preparing temperature are 9 wt%and 1400°*** further improve the MW absorption properties,the composite containing 9 wt%synthesized TiB_(2)(S-TiB_(2))has been sintered at 1400°*** high-temperature complex permittivity is greater than that of TiB_(2)/Al2O3 composite with 9 wt%C-TiB_(2)sintered at 1400°C and is directly proportional to the ***,TiB_(2)/Al2O3 composite with 9 wt%S-TiB_(2)possesses a better MW absorption at 25–500°C,its effective absorption bandwidth(RL<-5 dB)can reach 4.2 GHz at 25–500°*** the minimum reflection loss(RLmin)value reaches-43.41 dB at the temperature of 800°C with a thickness of 1.45 mm for TiB_(2)/Al2O3 composite with 9 wt%C-TiB_(2).Consequently,the satisfying absorbing layer(d<1.75 mm),flexural strength,heat stability and considerable high-temperature MW absorption ability grant TiB_(2)/Al2O3 ceramics practical applications as high-temperature microwave absorption materials(MAMs).

关键词： titanium boride aluminium oxide heat stability electric conductivity high-temperature microwave absorption properties

Temperature-insensitive microwave absorption of TiB2-Al_(2)O_(3)/MgAl_(2)O_(4) ceramics based on controllable electrical conductivity

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Science China(Technological Sciences) 2021年第6期64卷 1250-1263页

作者： LIU XiongZhang ZHANG Sealing LUO Hui CHEN Fu LI DongMeng WANG Xian GONG RongZhou School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China College of Mechanical and Electronic Engineering Northwest Agriculture and Forestry UniversityYangling 712100China School of Information Science and Engineering Wuhan University of Science and TechnologyWuhan 430081China

The design of the high-temperature microwave absorbing materials (MAMs) with temperature-insensitive and considerable microwave absorption (MA) capacity is a tremendous *** B2-Al_(2)O_(3)/Mg Al_(2)O_(4) MAMs are prepared by the spark plasma sintering (SPS).Further,the influences of the Al_(2)O_(3) content on the flexural strength,thermal stability,high-temperature electrical conductivity,dielectric and MA properties are *** results show that the Al_(2)O_(3) content is associated with flexural strength,high-temperature thermal stability,electrical conductivity,dielectric and MA ***,the temperatureinsensitive and considerable MA properties with the minimum reflection loss (RLmin) ranging from -19.4 to -14.3 dB and the effective absorption bandwidth (EAB,RL<-5 dB) of 3.19–3.55 GHz are attained at 25°C–700°C in 8.2–12.4 GHz as the Al_(2)O_(3) content increases from 70.6 wt%to 80.6 wt%.This is ascribed to the compensating effect of the positive and negative temperature coefficient materials on the high-temperature electrical conductivity as well as the co-play of the dipolar and interfacial polarization at elevated ***,Ti B2-Al_(2)O_(3)/Mg Al_(2)O_(4) ceramics exhibit the ideal prospect as the high-temperature MAMs.

关键词： titanium boride aluminium oxide magnesium-aluminate spinel high-temperature electrical conductivity temperatureinsensitive microwave absorption properties