About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
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Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
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Presentation Title |
Laser-powder Bed Fusion and Mechanical Properties of Al18Co30Cr10Ni32 Eutectic Multi-Principal Element Alloy |
Author(s) |
Thinh Hyunh, Abhishek Mehta, Nemanja Klejstan, Asif Mahmud, Kevin Graydon, Marko Knezevic, Brandon McWilliams, Kyu Cho, Yongho Sohn |
On-Site Speaker (Planned) |
Thinh Hyunh |
Abstract Scope |
A novel Al18Co30Cr10Fe10Ni32 eutectic multi-principal element alloy (MPEA) composition was gas atomized to produce powder feedstock, which was employed for laser powder bed fusion (LPBF) process optimization, followed by mechanical (tensile) testing and microstructural analysis. Melting was achieved in air at a superheating temperature of 1750 °C and atomized using Argon gas pressure of 2 MPa. LPBF optimization was performed as a function of laser power and scan speed, and density greater than 99.6 % was obtained using 350W and 1000 mm/s. The as-fabricated MPEA specimens consisted of FCC and BCC phases with cellular and lamellar eutectic microstructure. The as-built alloy had mechanical properties (tensile, yield and elongation of 1.4 GPa, 1.1 GPa and 21%, respectively) comparable to those of as-built IN718. Changes in microstructure and mechanical properties after high temperature exposure was examined by electron microscopy and x-ray diffraction, for analytical work to elucidate strengthening mechanisms. |