Layered surface structure of gas-atomized high Nb-containing TiAl powder and its impact on laser energy absorption for selective laser melting

Zhou, Y. H.1,2,3; Lin, S. F.1,2; Hou, Y. H.1,2,3; Wang, D. W.1,2; Zhou, P.1,2; Han, P. L.4; Li, Y. L.5; Yan, M.1,2

2018-05-31

10.1016/j.apsusc.2018.01.296

APPLIED SURFACE SCIENCE   影响因子和分区

0169-4332

1873-5584

Ti45Al8Nb alloy (in at.%) is designed to be an important high-temperature material. However, its fabrication through laser-based additive manufacturing is difficult to achieve. We present here that a good understanding of the surface structure of raw material (i.e. Ti45Al8Nb powder) is important for optimizing its process by selective laser melting (SLM). Detailed X-ray photoelectron spectroscopy (XPS) depth profiling and transmission electron microscopy (TEM) analyses were conducted to determine the surface structure of Ti45Al8Nb powder. An envelope structure (similar to 54.0 nm in thickness) was revealed for the powder, consisting of TiO2 + Nb2O5 (as the outer surface layer)/Al2O3 + Nb2O5 (as the intermediate layer)/Al2O3 (as the inner surface layer)/Ti45Al8Nb (as the matrix). During SLM, this layered surface structure interacted with the incident laser beam and improved the laser absorptivity of Ti45Al8Nb powder by 32.21%. SLM experiments demonstrate that the relative density of the as-printed parts can be realized to a high degree (98.70%), which confirms good laser energy absorption. Such layered surface structure with appropriate phase constitution is essential for promoting SLM of the Ti45Al8Nb alloy. (C) 2018 Elsevier B.V. All rights reserved.

Additive manufacturing Selective laser melting Ti45Al8Nb Surface structure Laser absorptivity

SCI ; EI

英语

第一 ; 通讯

National Science Foundation of Gurandong Province[2016A030313756]

Chemistry ; Materials Science ; Physics

Chemistry, Physical ; Materials Science, Coatings & Films ; Physics, Applied ; Physics, Condensed Matter

WOS:000427816400025

ELSEVIER SCIENCE BV

20180704789927

3D printers ; Binary alloys ; Depth profiling ; Energy absorption ; High resolution transmission electron microscopy ; High temperature effects ; Laser beams ; Melting ; Niobium oxide ; Surface structure ; Ternary alloys ; Titanium dioxide ; Transmission electron microscopy ; X ray photoelectron spectroscopy

Optical Devices and Systems:741.3 ; Laser Beam Interactions:744.8 ; Laser Applications:744.9 ; Printing Equipment:745.1.1 ; Chemistry:801 ; Chemical Operations:802.3 ; Chemical Products Generally:804 ; Inorganic Compounds:804.2 ; Physical Properties of Gases, Liquids and Solids:931.2

MATERIALS SCIENCE

Web of Science

1.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China
2.Southern Univ Sci & Technol, Shenzhen Key Lab Addit Mfg High Performance, Mat, Shenzhen 518055, Peoples R China
3.Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Heilongjiang, Peoples R China
4.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China
5.Nanchang Univ, Mech & Elect Engn Sch, Key Lab Robot & Welding Automat Jiangxi Prov, Nanchang 330031, Jiangxi, Peoples R China

Zhou, Y. H.,Lin, S. F.,Hou, Y. H.,et al. Layered surface structure of gas-atomized high Nb-containing TiAl powder and its impact on laser energy absorption for selective laser melting[J]. APPLIED SURFACE SCIENCE,2018,441:210-217.

Zhou, Y. H..,Lin, S. F..,Hou, Y. H..,Wang, D. W..,Zhou, P..,...&Yan, M..(2018).Layered surface structure of gas-atomized high Nb-containing TiAl powder and its impact on laser energy absorption for selective laser melting.APPLIED SURFACE SCIENCE,441,210-217.

Zhou, Y. H.,et al."Layered surface structure of gas-atomized high Nb-containing TiAl powder and its impact on laser energy absorption for selective laser melting".APPLIED SURFACE SCIENCE 441(2018):210-217.