The mechanical properties of Al3Sc single crystal investigated by nanoindentation using Hertzian elasticity theory method and Oliver-Pharr method - Details

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Abstract：

The　crystal　structure,　orientation,　reduced　modulus,　and　hardness　of　Al3Sc　single　crystal　were　studied　using　X-ray　diffraction　(XRD),　electron　backscatter　diffraction　(EBSD)　and　nanoindentation　techniques,　combined　with　Hertzian　elastic　theory　method　(Hertz)　and　Oliver-Pharr　method　(O&P).　Millimeter-sized　Al3Sc　single　crystals　were　prepared　using　quasi-equilibrium　solidification　of　hypereutectic　Al-15(wt　%)　Sc　alloy.　The　XRD　results　showed　that　the　samples　were　composed　of　L12-Al3Sc　and　Al　phases.　The　EBSD　and　nanoindentation　results　showed　that　for　five　Al3Sc　single　crystals　with　different　orientations,　the　reduced　moduli　measured　by　Hertz　method　were　146.6　±　0.4–148.3　±　0.2　GPa;　while　measured　by　O&P　method　they　were　147　±　2–150　±　3　GPa.　The　corresponding　hardnesses　were　varied　between　3.8　±　0.1　and　3.9　±　0.1　GPa.　The　Poisson＇s　ratio　and　elastic　constants　were　determined　through　iterative　calculation　based　on　the　relationship　between　the　reduced　modulus　and　Young＇s　modulus　at　various　orientations.　The　polycrystal　elastic　properties,　bulk　modulus,　shear　modulus　and　Young＇s　modulus,　were　determined.　The　elastic　constants　c11,　c12,　and　c44　were　179.2　±　0.4,　44.1　±　0.1,　and　68.3　±　0.3　GPa,　respectively;　the　Poisson＇s　ratio　was　0.196　±　0.001.　The　Young＇s　modulus　of　five　Al3Sc　single　crystals　oriented　in　different　directions　was　in　the　narrow　range　161–164　GPa.　The　anisotropy　factor　of　Al3Sc　crystal　was　1.011　±　0.002,　confirming　that　it　is　elastically　isotropic.　These　results　provide　fundamental　information　for　the　research　and　development　of　the　Al3Sc　intermetallic　compound　and　related　alloys　in　future.　©　2024　Elsevier　B.V.

Keyword：

Hertzian elasticity theory Oliver-Pharr method Mechanical properties Nanoindentation Al3Sc Single crystal

Author Community：

[ 1 ] [Ning J.]College of Materials Science and Engineering, National Engineering Laboratory for Industrial Big-data Application Technology, Beijing University of Technology, Beijing, 100124, China
[ 2 ] [Gao K.]College of Materials Science and Engineering, National Engineering Laboratory for Industrial Big-data Application Technology, Beijing University of Technology, Beijing, 100124, China
[ 3 ] [Wang J.]College of Materials Science and Engineering, National Engineering Laboratory for Industrial Big-data Application Technology, Beijing University of Technology, Beijing, 100124, China
[ 4 ] [Xiong X.]College of Materials Science and Engineering, National Engineering Laboratory for Industrial Big-data Application Technology, Beijing University of Technology, Beijing, 100124, China
[ 5 ] [Li H.]College of Materials Science and Engineering, National Engineering Laboratory for Industrial Big-data Application Technology, Beijing University of Technology, Beijing, 100124, China
[ 6 ] [Min F.]College of Materials Science and Engineering, National Engineering Laboratory for Industrial Big-data Application Technology, Beijing University of Technology, Beijing, 100124, China
[ 7 ] [Wen S.]College of Materials Science and Engineering, National Engineering Laboratory for Industrial Big-data Application Technology, Beijing University of Technology, Beijing, 100124, China
[ 8 ] [Wu X.]College of Materials Science and Engineering, National Engineering Laboratory for Industrial Big-data Application Technology, Beijing University of Technology, Beijing, 100124, China
[ 9 ] [Huang H.]College of Materials Science and Engineering, National Engineering Laboratory for Industrial Big-data Application Technology, Beijing University of Technology, Beijing, 100124, China
[ 10 ] [Wei W.]College of Materials Science and Engineering, National Engineering Laboratory for Industrial Big-data Application Technology, Beijing University of Technology, Beijing, 100124, China
[ 11 ] [Nie Z.]College of Materials Science and Engineering, National Engineering Laboratory for Industrial Big-data Application Technology, Beijing University of Technology, Beijing, 100124, China
[ 12 ] [Zhou D.]Yin Bang Clad Material Co. Ltd. Jiangsu Key Laboratory for Clad Materials, Wuxi, 214145, China

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Source ：

Journal of Alloys and Compounds

ISSN： 0925-8388

Year： 2024

Volume： 994

6 . 2 0 0

JCR@2022

Cited Count：

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SCOPUS Cited Count： 4

ESI Highly Cited Papers on the List： 0 Unfold All

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Chinese Cited Count：

30 Days PV： 5

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