Novel Al-X alloys with improved hardness

被引:32
|
作者
Hung, Cain J. [1 ,2 ]
Nayak, Sanjeev K. [1 ,2 ]
Sun, Yu [1 ,3 ]
Fennessy, Colette [4 ]
Vedula, Venkat K. [5 ]
Tulyani, Sonia [6 ]
Lee, Seok-Woo [1 ]
Alpay, S. Pamir [1 ,2 ]
Hebert, Rainer J. [1 ,2 ,7 ]
机构
[1] Univ Connecticut, Dept Mat Sci & Engn, Storrs, CT 06269 USA
[2] Univ Connecticut, Collins Aerosp Ctr Adv Mat, Technol Pk, Storrs, CT 06269 USA
[3] Schlumberger Reservoir Complet Technol Ctr, Rosharon, TX 77583 USA
[4] Collins Aerosp, One Hamilton Rd, Windsor Locks, CT 06096 USA
[5] UTC Addit Mfg Ctr Excellence, E Hartford, CT 06108 USA
[6] Pratt & Whitney, E Hartford, CT 06118 USA
[7] Univ Connecticut, Pratt & Whitney Addit Mfg Ctr, Technol Pk, Storrs, CT 06269 USA
关键词
Aluminum; Additive manufacturing; Alloy development; Density functional theory; Solid solution strengthening; MECHANICAL-PROPERTIES; PROCESSING PARAMETERS; AB-INITIO; CE ALLOY; PRECIPITATION; MICROSTRUCTURE; MG; NI; CO; TRANSITION;
D O I
10.1016/j.matdes.2020.108699
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In this study, our goal is to design solid solution strengthened aluminum alloys for manufacturing technologies that involve high cooling rates. This investigation starts with an analysis of solid solution strengthening using first principles calculations to determine elastic property changes and local lattice distortions from the introduction of different elements into a host aluminum lattice. These results, coupled with both equilibrium and non equilibrium solubility data, leads to the selection of cerium and cobalt as the primary candidate alloying elements. Alloys of Al-Ce and Al-Co at concentrations of 0.5, 1.0, and 3.0 at. % are then synthesized and subjected to laser glazing to produce non-equilibrium microstructures. The microstructure and solid solution characteristics are determined using a combination of scanning electron microscopy and transmission electron microscopy. Furthermore, nanoindentation is used to measure the hardness showing that both candidate systems harden significantly after glazing. In addition, Al-1.0Co at. % achieves a hardness comparable to Al6061-T6. These results conclusively show that cerium and cobalt are promising elements in the next generation aluminum alloys which make use of non-equilibrium processing conditions such as additive manufacturing. (C) 2020 The Authors. Published by Elsevier Ltd.
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页数:13
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