Micro/Nanomechanical Characterization of ScAlMgO4 Single Crystal by Instrumented Indentation and Scratch Methods
ScAlMgO4 (SCAM), which can be used as an epitaxial substrate material of GaN in power devices, faces the challenge of achieving a high-quality surface by ultra-precision polishing due to its brittle and easily cleaved characteristics, which are closely associated with its mechanical properties. The...
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description | ScAlMgO4 (SCAM), which can be used as an epitaxial substrate material of GaN in power devices, faces the challenge of achieving a high-quality surface by ultra-precision polishing due to its brittle and easily cleaved characteristics, which are closely associated with its mechanical properties. The micromechanical properties of SCAM single crystals were evaluated by nanoindentation and microscratch tests using different indenters. The elastic modulus EIT and the indentation hardness HIT of SCAM obtained by nanoindentation were 226 GPa and 12.1 GPa, respectively. Leaf-shaped chips and the associated step-like planes of SCAM can be found in the severely damaged regime during scratching by Berkovich and Vickers indenters with sharp edges due to the intersection of intense radial and lateral cracks. The fracture toughness (Kc = 1.12 MPa·m1/2) of SCAM can be obtained by using a scratch-based methodology for a spherical indenter based on linear elastic fracture mechanics (LEFM) under an appropriate range of applied loads. An optimal expression for calculating the fracture toughness of easily cleaved materials, including SCAM, via the Vickers indenter-induced cracking method using a Berkovich indenter was recommended. |
doi_str_mv | 10.3390/ma17153811 |
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The micromechanical properties of SCAM single crystals were evaluated by nanoindentation and microscratch tests using different indenters. The elastic modulus EIT and the indentation hardness HIT of SCAM obtained by nanoindentation were 226 GPa and 12.1 GPa, respectively. Leaf-shaped chips and the associated step-like planes of SCAM can be found in the severely damaged regime during scratching by Berkovich and Vickers indenters with sharp edges due to the intersection of intense radial and lateral cracks. The fracture toughness (Kc = 1.12 MPa·m1/2) of SCAM can be obtained by using a scratch-based methodology for a spherical indenter based on linear elastic fracture mechanics (LEFM) under an appropriate range of applied loads. An optimal expression for calculating the fracture toughness of easily cleaved materials, including SCAM, via the Vickers indenter-induced cracking method using a Berkovich indenter was recommended.</description><identifier>ISSN: 1996-1944</identifier><identifier>EISSN: 1996-1944</identifier><identifier>DOI: 10.3390/ma17153811</identifier><language>eng</language><publisher>Basel: MDPI AG</publisher><subject>Cracking (fracturing) ; Crystal structure ; Diamond pyramid hardness tests ; Elastic properties ; Fracture mechanics ; Fracture toughness ; Linear elastic fracture mechanics ; Mechanical properties ; Microscopy ; Modulus of elasticity ; Nanoindentation ; Scratching ; Single crystals ; Spectrum analysis ; Substrates</subject><ispartof>Materials, 2024-08, Vol.17 (15), p.3811</ispartof><rights>2024 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><cites>FETCH-LOGICAL-c217t-fdc07e0a1fb7927cce5ed25bfc587e659ba9087afeffebce57515aacc685b6633</cites><orcidid>0000-0001-5974-7713 ; 0000-0003-2374-7863 ; 0000-0001-9987-9729</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids></links><search><creatorcontrib>Ni, Zifeng</creatorcontrib><creatorcontrib>Yu, Jie</creatorcontrib><creatorcontrib>Chen, Guomei</creatorcontrib><creatorcontrib>Ji, Mingjie</creatorcontrib><creatorcontrib>Qian, Shanhua</creatorcontrib><creatorcontrib>Bian, Da</creatorcontrib><creatorcontrib>Liu, Ming</creatorcontrib><title>Micro/Nanomechanical Characterization of ScAlMgO4 Single Crystal by Instrumented Indentation and Scratch Methods</title><title>Materials</title><description>ScAlMgO4 (SCAM), which can be used as an epitaxial substrate material of GaN in power devices, faces the challenge of achieving a high-quality surface by ultra-precision polishing due to its brittle and easily cleaved characteristics, which are closely associated with its mechanical properties. 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An optimal expression for calculating the fracture toughness of easily cleaved materials, including SCAM, via the Vickers indenter-induced cracking method using a Berkovich indenter was recommended.</description><subject>Cracking (fracturing)</subject><subject>Crystal structure</subject><subject>Diamond pyramid hardness tests</subject><subject>Elastic properties</subject><subject>Fracture mechanics</subject><subject>Fracture toughness</subject><subject>Linear elastic fracture mechanics</subject><subject>Mechanical properties</subject><subject>Microscopy</subject><subject>Modulus of elasticity</subject><subject>Nanoindentation</subject><subject>Scratching</subject><subject>Single crystals</subject><subject>Spectrum analysis</subject><subject>Substrates</subject><issn>1996-1944</issn><issn>1996-1944</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2024</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><recordid>eNpdkE9rwzAMxcPYYKXrZZ8gsMsYZLXjOo6PpexPoV0P3c5BceQmJXE62zl0n34uHWxMFz2h3xPiRdEtJY-MSTLtgArKWU7pRTSiUmYJlbPZ5R99HU2c25NQjNE8laPosG6U7advYPoOVQ2mUdDGixosKI-2-QLf9CbudbxV83a928zibWN2LcYLe3Q-sOUxXhrn7dCh8ViFoQribANTBZ8Fr-p4jb7uK3cTXWloHU5--jj6eH56X7wmq83LcjFfJSqlwie6UkQgAapLIVOhFHKsUl5qxXOBGZclSJIL0Kg1lmErOOUASmU5L7OMsXF0f757sP3ngM4XXeMUti0Y7AdXMCJpmgebDOjdP3TfD9aE704UkZxxRgP1cKZCXs5Z1MXBNh3YY0FJccq_-M2ffQOJf3lb</recordid><startdate>20240802</startdate><enddate>20240802</enddate><creator>Ni, Zifeng</creator><creator>Yu, Jie</creator><creator>Chen, Guomei</creator><creator>Ji, Mingjie</creator><creator>Qian, Shanhua</creator><creator>Bian, Da</creator><creator>Liu, Ming</creator><general>MDPI AG</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>D1I</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>JG9</scope><scope>KB.</scope><scope>PDBOC</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>7X8</scope><orcidid>https://orcid.org/0000-0001-5974-7713</orcidid><orcidid>https://orcid.org/0000-0003-2374-7863</orcidid><orcidid>https://orcid.org/0000-0001-9987-9729</orcidid></search><sort><creationdate>20240802</creationdate><title>Micro/Nanomechanical Characterization of ScAlMgO4 Single Crystal by Instrumented Indentation and Scratch Methods</title><author>Ni, Zifeng ; 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The micromechanical properties of SCAM single crystals were evaluated by nanoindentation and microscratch tests using different indenters. The elastic modulus EIT and the indentation hardness HIT of SCAM obtained by nanoindentation were 226 GPa and 12.1 GPa, respectively. Leaf-shaped chips and the associated step-like planes of SCAM can be found in the severely damaged regime during scratching by Berkovich and Vickers indenters with sharp edges due to the intersection of intense radial and lateral cracks. The fracture toughness (Kc = 1.12 MPa·m1/2) of SCAM can be obtained by using a scratch-based methodology for a spherical indenter based on linear elastic fracture mechanics (LEFM) under an appropriate range of applied loads. 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subjects | Cracking (fracturing) Crystal structure Diamond pyramid hardness tests Elastic properties Fracture mechanics Fracture toughness Linear elastic fracture mechanics Mechanical properties Microscopy Modulus of elasticity Nanoindentation Scratching Single crystals Spectrum analysis Substrates |
title | Micro/Nanomechanical Characterization of ScAlMgO4 Single Crystal by Instrumented Indentation and Scratch Methods |
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