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A yttrium-containing high-temperature titanium alloy additively manufactured by selective electron beam melting

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Journal of Central South University 2015年第8期22卷 2857-2863页

作者：逯圣路汤慧萍马前洪权曾立英 D.H.StJohn School of Materials and Metallurgy Northeastern University State Key Laboratory of Porous Metal Materials (Northwest Institute for Nonferrous Metal Research) Centre for Advanced Materials Processing and Manufacturing School of Mechanical and Mining Engineering The University of Queensland Centre for Additive Manufacturing School of Aerospace Mechanical and Manufacturing EngineeringRMIT University

A yttrium-containing high-temperature titanium alloy(Ti-6Al-2.7Sn-4Zr-0.4Mo-0.45Si-0.1Y, mass fraction, %) has been additively manufactured using selective electron beam melting(SEBM). The resulting microstructure and textures were studied using scanning electron microscopy(SEM), transmission electron microscopy(TEM), X-ray diffraction(XRD) and electron backscattered diffraction(EBSD) and compared with the conventionally manufactured form. A notable distinct difference of microstructures is that additive manufacturing by SEBM enables homogeneous precipitation of fine Y2O3 dispersoids in the size range of 50-250 nm throughout the as-fabricated alloy, despite the presence of just trace levels of oxygen(7×10-4, mass fraction) and yttrium(10-3, mass fraction) in the alloy. In contrast, the conventionally manufactured alloy shows inhomogeneously distributed coarse Y2O3 precipitates, including cracked or debonded Y2O3 particles.

关键词： titanium alloys additive manufacturing rare earth elements yttrium selective electron beam melting

Microstructure and mechanical properties of WMoTaNbTi refractory high-entropy alloys fabricated by selective electron beam melting

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Journal of Materials Science & Technology 2022年第13期108卷 54-63页

作者： Bang Xiao Wenpeng Jia Huiping Tang Jian Wang Lian Zhou State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China State Key Laboratory of Porous Metal Materials Northwest Institute for Non-ferrous Metal ResearchXi’an 710016China

WMoTaNbTi RHEAs formed by SEBM with negative defocus distance were *** scanning speeds were applied,an electron beam with scanning speed at 2.5 m/s completely fused the premixed WMoTaNb alloyed powder and pure Ti *** vaporization of Nb and Ti elements happened during the formation of WMoTaNbTi RHEAs,however,the single BCC phase remains *** solid-solute strengthening caused by elemental vaporization,dropping percentage of Nb and Ti solutes in the matrix as well as improved ductilizing effects with decreasing scanning speeds leads to falling microhardness and better local *** of scanning speed at 4.0 m/s,3.5 m/s,3.0 m/s and 2.5 m/s is 578±17 HV,576±12 HV,573±10 HV and 511±2 HV,*** as-deposited WMoTaNbTi RHEA formed at a scanning speed of 2.5 m/s displays ultimate strength of 1312 MPa.

关键词： Refractory high-entropy alloys selective electron beam melting Solidification cracking Porosity Solid-solution strengthening

Corrosion and wear properties of micro-arc oxidation treated Ti6Al4V alloy prepared by selective electron beam melting

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Transactions of Nonferrous Metals Society of China 2020年第8期30卷 2132-2142页

作者： Xin YANG Wan-lin WANG Wen-jun MA Yan WANG Jun-gang YANG Shi-feng LIU Hui-ping TANG School of Materials Science and Engineering Xi’an University of TechnologyXi’an 710048China School of Metallurgical and Engineering Xi’an University of Architecture and TechnologyXi’an 710055China State Key Laboratory of Porous Metal Materials Northwest Institute for Non-ferrous Metal ResearchXi’an 710016China

In order to analyze the effect of voltage during micro-arc oxidation(MAO)on corrosion and wear properties of Ti6Al4V(TC4),the MAO technology was employed to treat TC4 samples fabricated by selective electron beam melting(SEBM)at the voltages of 400,420 and 450 *** results show that the metastable anatase phase gradually transforms to rutile phase with oxidation time and temperature *** surface morphology of coating contains numerous micropores with uniform size *** and pores over 10μm are found on MAO-TC4 sample with applied voltage of 450 *** thickness of MAO coating is positively correlated with the *** corrosion resistance and wear resistance are related to phase composition,micropore size distribution on the surface and film *** the voltage is 420 V,the coating shows the smallest corrosion current density(0.960×10^-7 A/cm^2)and the largest resistance(7.17×10^5Ω·cm^2).Under the same load condition,the coating exhibits larger friction coefficient and wear loss than the TC4 *** the increase of voltage,the wear mechanism of the coating changes from abrasive wear to adhesive wear,and the adhesive wear is intensified at applied voltage of 450 V,with a maximum friction coefficient of 0.821.

关键词： selective electron beam melting micro-arc oxidation TC4 alloy corrosion wear property

A comparative study of surface characterization and corrosion behavior of micro-arc oxidation treated Ti-6Al-4V alloy prepared by SEBM and SLM

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Journal of Iron and Steel Research International 2023年第1期30卷 165-175页

作者： Qing-bo Yan Tong Xue Shi-feng Liu Wan-lin Wang Yan Wang Xi Song Xin Yang Wei-wei Shang Xi’an University of Architecture and Technology Xi’an 710055ShaanxiChina School of Metallurgical and Engineering Xi’an University of Architecture and TechnologyXi’an 710055ShaanxiChina School of Materials Science and Engineering Xi’an University of TechnologyXi’an 710048ShaanxiChina Shaanxi Steel Group Industrial Innovation Research Institute Co. Ltd.Hanzhong 723000ShaanxiChina

Additively manufactured Ti-6Al-4V(TC4)parts have been successfully employed as artificial implants in dental and orthopedic surgery due to their excellent mechanical ***,the suboptimal corrosion resistance limits their *** surface characterization and corrosion behavior of micro-arc oxidation(MAO)treated TC4 alloy prepared by selective electron beam melting(SEBM)and selective laser melting(SLM)technologies were *** corrosion resistance mechanism of SLM-MAO and SEBM-MAO was clarified through the analysis of the microstructure evolution,surface morphology,and electrochemical *** results show that the anatase-type TiO_(2) is partially transformed into the slankite phase after MAO *** surface roughness of SEBM sample was reduced by MAO coating,while the surface roughness of SLM sample increased after MAO,which is related to the difference between the microstructure of the deposited samples caused by different additive manufacturing *** MAO time was 15 min,SLM-MAO and SEBM-MAO coating displayed the best and the worst corrosion resistance,respectively.

关键词： TC4 alloy selective laser melting selective electron beam melting Micro-arc oxidation Corrosion resistance