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The Thermo-Mechanical Properties of novel MAX phase Ceramics / STEPHEN COUNSELL

Swansea University Author: STEPHEN COUNSELL

DOI (Published version): 10.23889/SUthesis.59940

Abstract

The main focus of this research work was to investigate the high-temperature mechanical performance of the electrically conductive Ti2AlC and Ti3SiC2 MAX phases. Using microscopy techniques, it was found that Ti2AlC had a grain size approximately 4 times larger than the Ti3SiC2 material. Secondary p...

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Published: Swansea 2022
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
Supervisor: Penney, David ; Birosca, Soran ; Fourlaris, George
URI: https://cronfa.swan.ac.uk/Record/cronfa59940
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first_indexed 2022-05-03T10:28:21Z
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fullrecord <?xml version="1.0"?><rfc1807><datestamp>2022-05-03T11:46:58.0887230</datestamp><bib-version>v2</bib-version><id>59940</id><entry>2022-05-03</entry><title>The Thermo-Mechanical Properties of novel MAX phase Ceramics</title><swanseaauthors><author><sid>bf355dfb0d039e2e1dd42e608d17e0a4</sid><firstname>STEPHEN</firstname><surname>COUNSELL</surname><name>STEPHEN COUNSELL</name><active>true</active><ethesisStudent>false</ethesisStudent></author></swanseaauthors><date>2022-05-03</date><abstract>The main focus of this research work was to investigate the high-temperature mechanical performance of the electrically conductive Ti2AlC and Ti3SiC2 MAX phases. Using microscopy techniques, it was found that Ti2AlC had a grain size approximately 4 times larger than the Ti3SiC2 material. Secondary phases were also found to be present in both materials. Electron backscatter diffraction analysis revealed that both materials appeared to have a random texture. A Gleeble 3500 was used to test each materials response to high-strain rate, high-temperature uniaxial compression testing. Ti3SiC2 was found to generally have higher ultimate compressive strengths for each test condition and thereby validating a Hall-Petch relationship. For Ti2AlC, the slower the strain rate, the lower the ultimate compressive stress and also, for each strain rate, the higher the temperature, the lower the ultimate compressive stress. The behaviour of Ti3SiC2 was more incoherent, although generally followed a trend of increasing ductility as the temperature was increased and strain rate decreased. Both MAX phases were thermally shocked while being subjected to a compressive load from either 1000&#xB0;C or 1200&#xB0;C. For the 1000&#xB0;C samples, there was a slight increase in the ultimate compressive stress when the compressive load was increased, while the for the 1200&#xB0;C samples the change in compressive loads under quenching had no significant effect on the mechanical properties. The microstructure of the thermo-mechanically tested samples revealed substantial deformation in the form of intergranular and transgranular cracking, kinking, delaminations, voids and grain bending. The ductile samples saw a deformation &#x2018;dead zone&#x2019; at the edges that had been closest to the compression anvil. The EBSD analysis revealed that the primary phase in samples tested at slower strain rates orientated favourably to the [0001] direction. These samples also showed evidence of low angle grain boundaries. A GND analysis of both materials was also undertaken and revealed higher GND densities with increasing strain rate and temperature for Ti3SiC2 samples, with the opposite being true of Ti2AlC samples.</abstract><type>E-Thesis</type><journal/><volume/><journalNumber/><paginationStart/><paginationEnd/><publisher/><placeOfPublication>Swansea</placeOfPublication><isbnPrint/><isbnElectronic/><issnPrint/><issnElectronic/><keywords>MAX Phases, Thermo-Mechanical Properties, Thermal, Gleeble, Ceramics</keywords><publishedDay>28</publishedDay><publishedMonth>4</publishedMonth><publishedYear>2022</publishedYear><publishedDate>2022-04-28</publishedDate><doi>10.23889/SUthesis.59940</doi><url/><notes/><college>COLLEGE NANME</college><CollegeCode>COLLEGE CODE</CollegeCode><institution>Swansea University</institution><supervisor>Penney, David ; Birosca, Soran ; Fourlaris, George</supervisor><degreelevel>Doctoral</degreelevel><degreename>Ph.D</degreename><degreesponsorsfunders>EPSRC</degreesponsorsfunders><apcterm/><lastEdited>2022-05-03T11:46:58.0887230</lastEdited><Created>2022-05-03T11:25:18.5463083</Created><path><level id="1">Faculty of Science and Engineering</level><level id="2">School of Engineering and Applied Sciences - Uncategorised</level></path><authors><author><firstname>STEPHEN</firstname><surname>COUNSELL</surname><order>1</order></author></authors><documents><document><filename>59940__23956__a8415511087147458b1d988674bfd91e.pdf</filename><originalFilename>Counsell_Stephen_PhD_Thesis_Final_Redacted_Signature.pdf</originalFilename><uploaded>2022-05-03T11:34:56.1457653</uploaded><type>Output</type><contentLength>34756686</contentLength><contentType>application/pdf</contentType><version>E-Thesis &#x2013; open access</version><cronfaStatus>true</cronfaStatus><documentNotes>Copyright: The author, Stephen Counsell, 2022.</documentNotes><copyrightCorrect>true</copyrightCorrect><language>eng</language></document></documents><OutputDurs/></rfc1807>
spelling 2022-05-03T11:46:58.0887230 v2 59940 2022-05-03 The Thermo-Mechanical Properties of novel MAX phase Ceramics bf355dfb0d039e2e1dd42e608d17e0a4 STEPHEN COUNSELL STEPHEN COUNSELL true false 2022-05-03 The main focus of this research work was to investigate the high-temperature mechanical performance of the electrically conductive Ti2AlC and Ti3SiC2 MAX phases. Using microscopy techniques, it was found that Ti2AlC had a grain size approximately 4 times larger than the Ti3SiC2 material. Secondary phases were also found to be present in both materials. Electron backscatter diffraction analysis revealed that both materials appeared to have a random texture. A Gleeble 3500 was used to test each materials response to high-strain rate, high-temperature uniaxial compression testing. Ti3SiC2 was found to generally have higher ultimate compressive strengths for each test condition and thereby validating a Hall-Petch relationship. For Ti2AlC, the slower the strain rate, the lower the ultimate compressive stress and also, for each strain rate, the higher the temperature, the lower the ultimate compressive stress. The behaviour of Ti3SiC2 was more incoherent, although generally followed a trend of increasing ductility as the temperature was increased and strain rate decreased. Both MAX phases were thermally shocked while being subjected to a compressive load from either 1000°C or 1200°C. For the 1000°C samples, there was a slight increase in the ultimate compressive stress when the compressive load was increased, while the for the 1200°C samples the change in compressive loads under quenching had no significant effect on the mechanical properties. The microstructure of the thermo-mechanically tested samples revealed substantial deformation in the form of intergranular and transgranular cracking, kinking, delaminations, voids and grain bending. The ductile samples saw a deformation ‘dead zone’ at the edges that had been closest to the compression anvil. The EBSD analysis revealed that the primary phase in samples tested at slower strain rates orientated favourably to the [0001] direction. These samples also showed evidence of low angle grain boundaries. A GND analysis of both materials was also undertaken and revealed higher GND densities with increasing strain rate and temperature for Ti3SiC2 samples, with the opposite being true of Ti2AlC samples. E-Thesis Swansea MAX Phases, Thermo-Mechanical Properties, Thermal, Gleeble, Ceramics 28 4 2022 2022-04-28 10.23889/SUthesis.59940 COLLEGE NANME COLLEGE CODE Swansea University Penney, David ; Birosca, Soran ; Fourlaris, George Doctoral Ph.D EPSRC 2022-05-03T11:46:58.0887230 2022-05-03T11:25:18.5463083 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised STEPHEN COUNSELL 1 59940__23956__a8415511087147458b1d988674bfd91e.pdf Counsell_Stephen_PhD_Thesis_Final_Redacted_Signature.pdf 2022-05-03T11:34:56.1457653 Output 34756686 application/pdf E-Thesis – open access true Copyright: The author, Stephen Counsell, 2022. true eng
title The Thermo-Mechanical Properties of novel MAX phase Ceramics
spellingShingle The Thermo-Mechanical Properties of novel MAX phase Ceramics
STEPHEN COUNSELL
title_short The Thermo-Mechanical Properties of novel MAX phase Ceramics
title_full The Thermo-Mechanical Properties of novel MAX phase Ceramics
title_fullStr The Thermo-Mechanical Properties of novel MAX phase Ceramics
title_full_unstemmed The Thermo-Mechanical Properties of novel MAX phase Ceramics
title_sort The Thermo-Mechanical Properties of novel MAX phase Ceramics
author_id_str_mv bf355dfb0d039e2e1dd42e608d17e0a4
author_id_fullname_str_mv bf355dfb0d039e2e1dd42e608d17e0a4_***_STEPHEN COUNSELL
author STEPHEN COUNSELL
author2 STEPHEN COUNSELL
format E-Thesis
publishDate 2022
institution Swansea University
doi_str_mv 10.23889/SUthesis.59940
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
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description The main focus of this research work was to investigate the high-temperature mechanical performance of the electrically conductive Ti2AlC and Ti3SiC2 MAX phases. Using microscopy techniques, it was found that Ti2AlC had a grain size approximately 4 times larger than the Ti3SiC2 material. Secondary phases were also found to be present in both materials. Electron backscatter diffraction analysis revealed that both materials appeared to have a random texture. A Gleeble 3500 was used to test each materials response to high-strain rate, high-temperature uniaxial compression testing. Ti3SiC2 was found to generally have higher ultimate compressive strengths for each test condition and thereby validating a Hall-Petch relationship. For Ti2AlC, the slower the strain rate, the lower the ultimate compressive stress and also, for each strain rate, the higher the temperature, the lower the ultimate compressive stress. The behaviour of Ti3SiC2 was more incoherent, although generally followed a trend of increasing ductility as the temperature was increased and strain rate decreased. Both MAX phases were thermally shocked while being subjected to a compressive load from either 1000°C or 1200°C. For the 1000°C samples, there was a slight increase in the ultimate compressive stress when the compressive load was increased, while the for the 1200°C samples the change in compressive loads under quenching had no significant effect on the mechanical properties. The microstructure of the thermo-mechanically tested samples revealed substantial deformation in the form of intergranular and transgranular cracking, kinking, delaminations, voids and grain bending. The ductile samples saw a deformation ‘dead zone’ at the edges that had been closest to the compression anvil. The EBSD analysis revealed that the primary phase in samples tested at slower strain rates orientated favourably to the [0001] direction. These samples also showed evidence of low angle grain boundaries. A GND analysis of both materials was also undertaken and revealed higher GND densities with increasing strain rate and temperature for Ti3SiC2 samples, with the opposite being true of Ti2AlC samples.
published_date 2022-04-28T04:17:37Z
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score 10.997933

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