Microstructural development of electron beam processed Al-3Ti-1Sc alloy under different electron beam scanning speeds

Yu, P.1,2; Yan, M.1,2; Tomus, D.3; Brice, C. A.4; Bettles, C. J.3; Muddle, B.3; Qian, M.2,5

2018-09

10.1016/j.matchar.2017.09.005

MATERIALS CHARACTERIZATION   影响因子和分区

1044-5803

1873-4189

A systematic study has been made of the microstructural development in as-cast 30 mm thick Al-3Ti-1Sc (wt%) plate samples that were processed by electron beam (EB) melting at different scanning speeds of 3, 5, 8, 12, 15 and 20 mm/s. The composition of the alloy is designed to capitalize on the potential for significantly extended solubility values of both Sc and Ti in Al when cooled at high cooling rates. The resulting microstructures are characterised using transmission electron microscopy (TEM) and other analytical means, assisted with Thermo-Calc predictions and Vicker's microhardness measurements. EB scanning speed plays a key role in determining the phase formation and microstructural development in the Al-3Ti-1Sc alloy when the beam is applied an accelerating voltage of 50 kV and a current of 30 mu A. The major microstructural features in the re-solidified zone include (i) the formation of the primary tetragonal Al-3(Ti,Sc) phases and their retention or subsequent transformation to stable cubic Al-3(Ti,Sc) phases; (ii) the complete suppression of the primary tetragonal Al-3(Ti,Sc) phases at the scanning speed of 20 mm/s; and (iii) the formation of cubic Al-3(Ti,Sc) precipitates in the alpha(Al) matrix supersaturated with both Sc and Ti. These experimental findings are informative for both EB processing of Al-Ti-Sc alloys and the design of new Al alloys for additive manufacturing processes.

Aluminium alloys Electron beam Melting Scandium Titanium Additive Manufacturing

SCI ; EI

英语

第一 ; 通讯

LockheedMartin Aeronautics Company, Fort Worth, TX, USA[76108]

Materials Science ; Metallurgy & Metallurgical Engineering

Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Materials Science, Characterization & Testing

WOS:000448099000006

ELSEVIER SCIENCE INC

20173904209145

3D printers ; Aluminum alloys ; Electron beam melting ; Electron beams ; Electrons ; High resolution transmission electron microscopy ; Linear transformations ; Melting ; Microstructural evolution ; Scandium ; Scanning ; Ternary alloys ; Titanium ; Titanium alloys ; Transmission electron microscopy

Aluminum Alloys:541.2 ; Titanium and Alloys:542.3 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Optical Devices and Systems:741.3 ; Printing Equipment:745.1.1 ; Chemical Operations:802.3 ; Chemical Agents and Basic Industrial Chemicals:803 ; Mathematical Transformations:921.3

MATERIALS SCIENCE

Web of Science

1.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China
2.Univ Queensland, Sch Mech & Min Engn, ARC Ctr Excellence Design Light Met, Brisbane, Qld 4072, Australia
3.Monash Univ, Dept Mat Sci & Engn, Clayton, Vic 3800, Australia
4.Lockheed Martin Aeronaut Co, Ft Worth, TX 76108 USA
5.RMIT Univ, Sch Engn, Ctr Addit Mfg, Melbourne, Vic 3000, Australia

Yu, P.,Yan, M.,Tomus, D.,et al. Microstructural development of electron beam processed Al-3Ti-1Sc alloy under different electron beam scanning speeds[J]. MATERIALS CHARACTERIZATION,2018,143:43-49.

Yu, P..,Yan, M..,Tomus, D..,Brice, C. A..,Bettles, C. J..,...&Qian, M..(2018).Microstructural development of electron beam processed Al-3Ti-1Sc alloy under different electron beam scanning speeds.MATERIALS CHARACTERIZATION,143,43-49.

Yu, P.,et al."Microstructural development of electron beam processed Al-3Ti-1Sc alloy under different electron beam scanning speeds".MATERIALS CHARACTERIZATION 143(2018):43-49.