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Unique deformation behavior and microstructure evolution in high-temperature processing of a low-density TiAlVNb2 refractory high-entropy alloy
•Hot deformation behavior of a low-density refractory high-entropy alloy was studied.•The apparent activation energy for hot-deformation was 401–375 kJ∙mol−1.•A combined DDRX+CDRX process takes place in this novel alloy in hot deformation. Thermal deformation behaviors and microstructure evolution o...
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| Published in: | Journal of alloys and compounds 2021-12, Vol.885, p.160962, Article 160962 |
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| container_start_page | 160962 |
| container_title | Journal of alloys and compounds |
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| creator | Bai, Z.C. Ding, X.F. Hu, Q. Yang, M. Fan, Z.T. Liu, X.W. |
| description | •Hot deformation behavior of a low-density refractory high-entropy alloy was studied.•The apparent activation energy for hot-deformation was 401–375 kJ∙mol−1.•A combined DDRX+CDRX process takes place in this novel alloy in hot deformation.
Thermal deformation behaviors and microstructure evolution of a novel light refractory high-entropy alloy (RHEA) TiAlVNb2 were investigated in detail. Uniaxial compression was implemented at different strain rates from 10−3s−1 to 10−1s−1 and various temperatures from 1000 °C to 1200 °C. Stress-strain curves combined with electron back scattered diffraction analysis indicate that work hardening, dynamic recrystallization (DRX) and dynamic recovery (DRV) occur during the thermal compression. Flow stress analysis carried out by the Arrhenius-type power law relationship suggests a high apparent activation energy of 401–375 kJ∙mol−1 over the whole range of strain. The DRX acts as one of the main softening mechanisms, in which the DRX grains show a typical trend of increased size and fraction with increased temperature or/and decreased strain rate. Further analyses, however, reveal a unique DRX feature that both discontinuous and continuous DRX processes take place in this RHEA. The discontinuous DRX was proved by bulge (migration) of original grain boundaries, kernel average misorientation map and transmission electron microscopy; while the cumulative misorientation (point to origin) and the new grains formed at original grain interior support the existence of continuous DRX (CDRX). |
| doi_str_mv | 10.1016/j.jallcom.2021.160962 |
| format | article |
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Thermal deformation behaviors and microstructure evolution of a novel light refractory high-entropy alloy (RHEA) TiAlVNb2 were investigated in detail. Uniaxial compression was implemented at different strain rates from 10−3s−1 to 10−1s−1 and various temperatures from 1000 °C to 1200 °C. Stress-strain curves combined with electron back scattered diffraction analysis indicate that work hardening, dynamic recrystallization (DRX) and dynamic recovery (DRV) occur during the thermal compression. Flow stress analysis carried out by the Arrhenius-type power law relationship suggests a high apparent activation energy of 401–375 kJ∙mol−1 over the whole range of strain. The DRX acts as one of the main softening mechanisms, in which the DRX grains show a typical trend of increased size and fraction with increased temperature or/and decreased strain rate. Further analyses, however, reveal a unique DRX feature that both discontinuous and continuous DRX processes take place in this RHEA. The discontinuous DRX was proved by bulge (migration) of original grain boundaries, kernel average misorientation map and transmission electron microscopy; while the cumulative misorientation (point to origin) and the new grains formed at original grain interior support the existence of continuous DRX (CDRX).</description><identifier>ISSN: 0925-8388</identifier><identifier>EISSN: 1873-4669</identifier><identifier>DOI: 10.1016/j.jallcom.2021.160962</identifier><language>eng</language><publisher>Lausanne: Elsevier B.V</publisher><subject>Deformation ; Deformation behavior ; Dynamic recovery ; Dynamic recrystallization ; Evolution ; Grain boundaries ; High entropy alloys ; High temperature ; Microstructure ; Microstructure evolution ; Misalignment ; Refractory high-entropy alloy ; Strain analysis ; Strain rate ; Stress analysis ; Stress-strain curves ; Work hardening ; Yield strength</subject><ispartof>Journal of alloys and compounds, 2021-12, Vol.885, p.160962, Article 160962</ispartof><rights>2021 Elsevier B.V.</rights><rights>Copyright Elsevier BV Dec 10, 2021</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c337t-f3cc278096a2a7a99a71734a9c41016c126ce595e514ff2d5b71da205f2acb823</citedby><cites>FETCH-LOGICAL-c337t-f3cc278096a2a7a99a71734a9c41016c126ce595e514ff2d5b71da205f2acb823</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>315,786,790,27957,27958</link.rule.ids></links><search><creatorcontrib>Bai, Z.C.</creatorcontrib><creatorcontrib>Ding, X.F.</creatorcontrib><creatorcontrib>Hu, Q.</creatorcontrib><creatorcontrib>Yang, M.</creatorcontrib><creatorcontrib>Fan, Z.T.</creatorcontrib><creatorcontrib>Liu, X.W.</creatorcontrib><title>Unique deformation behavior and microstructure evolution in high-temperature processing of a low-density TiAlVNb2 refractory high-entropy alloy</title><title>Journal of alloys and compounds</title><description>•Hot deformation behavior of a low-density refractory high-entropy alloy was studied.•The apparent activation energy for hot-deformation was 401–375 kJ∙mol−1.•A combined DDRX+CDRX process takes place in this novel alloy in hot deformation.
Thermal deformation behaviors and microstructure evolution of a novel light refractory high-entropy alloy (RHEA) TiAlVNb2 were investigated in detail. Uniaxial compression was implemented at different strain rates from 10−3s−1 to 10−1s−1 and various temperatures from 1000 °C to 1200 °C. Stress-strain curves combined with electron back scattered diffraction analysis indicate that work hardening, dynamic recrystallization (DRX) and dynamic recovery (DRV) occur during the thermal compression. Flow stress analysis carried out by the Arrhenius-type power law relationship suggests a high apparent activation energy of 401–375 kJ∙mol−1 over the whole range of strain. The DRX acts as one of the main softening mechanisms, in which the DRX grains show a typical trend of increased size and fraction with increased temperature or/and decreased strain rate. Further analyses, however, reveal a unique DRX feature that both discontinuous and continuous DRX processes take place in this RHEA. The discontinuous DRX was proved by bulge (migration) of original grain boundaries, kernel average misorientation map and transmission electron microscopy; while the cumulative misorientation (point to origin) and the new grains formed at original grain interior support the existence of continuous DRX (CDRX).</description><subject>Deformation</subject><subject>Deformation behavior</subject><subject>Dynamic recovery</subject><subject>Dynamic recrystallization</subject><subject>Evolution</subject><subject>Grain boundaries</subject><subject>High entropy alloys</subject><subject>High temperature</subject><subject>Microstructure</subject><subject>Microstructure evolution</subject><subject>Misalignment</subject><subject>Refractory high-entropy alloy</subject><subject>Strain analysis</subject><subject>Strain rate</subject><subject>Stress analysis</subject><subject>Stress-strain curves</subject><subject>Work hardening</subject><subject>Yield strength</subject><issn>0925-8388</issn><issn>1873-4669</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><recordid>eNqFkM1OwzAQhC0EEuXnEZAscU6xnTpOTggh_iQEl5ar5Tob6iixi-0U5Sl4ZdyGO6c97MzszofQFSVzSmhx085b1XXa9XNGGJ3TglQFO0IzWoo8WxRFdYxmpGI8K_OyPEVnIbSEEFrldIZ-VtZ8DYBraJzvVTTO4jVs1M44j5WtcW-0dyH6QcfBA4ad64aDyli8MZ-bLEK_Ba8O2613GkIw9hO7Bivcue-sBhtMHPHS3HUfb2uGPTRe6ej8OAWAjd5tR5w6uPECnTSqC3D5N8_R6vFhef-cvb4_vdzfvWY6z0XMmlxrJspUVDElVFUpQUW-UJVe7JFoygoNvOLA6aJpWM3XgtaKEd4wpdcly8_R9ZSbXk79Q5StG7xNJyXjJSGCU0GTik-qPYOQHpdbb3rlR0mJ3B-SrfxjL_fs5cQ--W4nH6QKOwNeBm3AaqiNBx1l7cw_Cb-SqZMt</recordid><startdate>20211210</startdate><enddate>20211210</enddate><creator>Bai, Z.C.</creator><creator>Ding, X.F.</creator><creator>Hu, Q.</creator><creator>Yang, M.</creator><creator>Fan, Z.T.</creator><creator>Liu, X.W.</creator><general>Elsevier B.V</general><general>Elsevier BV</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope></search><sort><creationdate>20211210</creationdate><title>Unique deformation behavior and microstructure evolution in high-temperature processing of a low-density TiAlVNb2 refractory high-entropy alloy</title><author>Bai, Z.C. ; Ding, X.F. ; Hu, Q. ; Yang, M. ; Fan, Z.T. ; Liu, X.W.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c337t-f3cc278096a2a7a99a71734a9c41016c126ce595e514ff2d5b71da205f2acb823</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2021</creationdate><topic>Deformation</topic><topic>Deformation behavior</topic><topic>Dynamic recovery</topic><topic>Dynamic recrystallization</topic><topic>Evolution</topic><topic>Grain boundaries</topic><topic>High entropy alloys</topic><topic>High temperature</topic><topic>Microstructure</topic><topic>Microstructure evolution</topic><topic>Misalignment</topic><topic>Refractory high-entropy alloy</topic><topic>Strain analysis</topic><topic>Strain rate</topic><topic>Stress analysis</topic><topic>Stress-strain curves</topic><topic>Work hardening</topic><topic>Yield strength</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Bai, Z.C.</creatorcontrib><creatorcontrib>Ding, X.F.</creatorcontrib><creatorcontrib>Hu, Q.</creatorcontrib><creatorcontrib>Yang, M.</creatorcontrib><creatorcontrib>Fan, Z.T.</creatorcontrib><creatorcontrib>Liu, X.W.</creatorcontrib><collection>CrossRef</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>Journal of alloys and compounds</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Bai, Z.C.</au><au>Ding, X.F.</au><au>Hu, Q.</au><au>Yang, M.</au><au>Fan, Z.T.</au><au>Liu, X.W.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Unique deformation behavior and microstructure evolution in high-temperature processing of a low-density TiAlVNb2 refractory high-entropy alloy</atitle><jtitle>Journal of alloys and compounds</jtitle><date>2021-12-10</date><risdate>2021</risdate><volume>885</volume><spage>160962</spage><pages>160962-</pages><artnum>160962</artnum><issn>0925-8388</issn><eissn>1873-4669</eissn><abstract>•Hot deformation behavior of a low-density refractory high-entropy alloy was studied.•The apparent activation energy for hot-deformation was 401–375 kJ∙mol−1.•A combined DDRX+CDRX process takes place in this novel alloy in hot deformation.
Thermal deformation behaviors and microstructure evolution of a novel light refractory high-entropy alloy (RHEA) TiAlVNb2 were investigated in detail. Uniaxial compression was implemented at different strain rates from 10−3s−1 to 10−1s−1 and various temperatures from 1000 °C to 1200 °C. Stress-strain curves combined with electron back scattered diffraction analysis indicate that work hardening, dynamic recrystallization (DRX) and dynamic recovery (DRV) occur during the thermal compression. Flow stress analysis carried out by the Arrhenius-type power law relationship suggests a high apparent activation energy of 401–375 kJ∙mol−1 over the whole range of strain. The DRX acts as one of the main softening mechanisms, in which the DRX grains show a typical trend of increased size and fraction with increased temperature or/and decreased strain rate. Further analyses, however, reveal a unique DRX feature that both discontinuous and continuous DRX processes take place in this RHEA. The discontinuous DRX was proved by bulge (migration) of original grain boundaries, kernel average misorientation map and transmission electron microscopy; while the cumulative misorientation (point to origin) and the new grains formed at original grain interior support the existence of continuous DRX (CDRX).</abstract><cop>Lausanne</cop><pub>Elsevier B.V</pub><doi>10.1016/j.jallcom.2021.160962</doi></addata></record> |
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| source | ScienceDirect Freedom Collection 2022-2024 |
| subjects | Deformation Deformation behavior Dynamic recovery Dynamic recrystallization Evolution Grain boundaries High entropy alloys High temperature Microstructure Microstructure evolution Misalignment Refractory high-entropy alloy Strain analysis Strain rate Stress analysis Stress-strain curves Work hardening Yield strength |
| title | Unique deformation behavior and microstructure evolution in high-temperature processing of a low-density TiAlVNb2 refractory high-entropy alloy |
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