Nanoindentation creep behavior of diverse microstructures in a pre-strained interstitial high-entropy alloy by high-throughput mapping

Time-dependent plastic deformation, also known as creep, can occur in high-melting-point materials at room temperature when subjected to submicron plastic contact (e.g., components in micro-electronic mechanical systems) due to the extremely high stress conditions. Previous investigations of creep b...

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Veröffentlicht in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2022-10, Vol.856, p.143988, Article 143988
Hauptverfasser: Fan, Qimeng, Gan, Kefu, Yan, Dingshun, Li, Zhiming
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container_title Materials science & engineering. A, Structural materials : properties, microstructure and processing
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Gan, Kefu
Yan, Dingshun
Li, Zhiming
description Time-dependent plastic deformation, also known as creep, can occur in high-melting-point materials at room temperature when subjected to submicron plastic contact (e.g., components in micro-electronic mechanical systems) due to the extremely high stress conditions. Previous investigations of creep behavior at submicron scale mainly focus on uniform microstructures, whereas recently developed high-performance structural materials usually show complex microstructural heterogeneities. Here, we demonstrate a high-throughput nanoindentation approach to unveil the creep behavior of locally diverse microstructures, via a case study on an interstitial high-entropy alloy (iHEA). The prototype iHEA specimen was firstly pre-strained by severe cold-rolling to achieve diverse microstructure features including dense dislocations, nanotwins and nanograins. Nanoindentation mapping with 144 indents is conducted to collect creep data from all types of diverse microstructures, followed by systematical calculations based on power-law analysis. Then intuitive contour maps of nanohardness (H), strain rate (ε˙) and stress exponent (n) are attained. The individual creep mechanism of each microstructure variant is evaluated by correlating local microstructure features with corresponding creep responses from these contour maps. With the increase of n value for different sample regions, the ε˙ value inversely reduces and the corresponding dominant creep mechanism gradually converts from diffusion-mediated mode to dislocation-controlled one. The presence of nanograins and nanotwins significantly hinders dislocation interactions and promotes stress-induced diffusion. This work verifies that nanoindentation creep behavior is highly correlated with local microstructure features, and the mapping approach is feasible for evaluating creep-resistance of locally diverse microstructures under extremely high-stress conditions. •High-throughput nanoindentation tests are conducted on an interstitial high-entropy alloy with diverse microstructure features.•Nanoindentation mapping including nanohardness (H), strain rate (ε˙) and stress exponent (n) uncovers the individual creep behavior of each microstructural variant.•Correlated the value of H, ε˙ and n with local microstructures of all indent positions, the creep mechanisms originating from each assembly of microstructural variants are elucidated.•Dominant creep mechanisms of all indents convert from diffusion-mediated model to dislocation-contr
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Previous investigations of creep behavior at submicron scale mainly focus on uniform microstructures, whereas recently developed high-performance structural materials usually show complex microstructural heterogeneities. Here, we demonstrate a high-throughput nanoindentation approach to unveil the creep behavior of locally diverse microstructures, via a case study on an interstitial high-entropy alloy (iHEA). The prototype iHEA specimen was firstly pre-strained by severe cold-rolling to achieve diverse microstructure features including dense dislocations, nanotwins and nanograins. Nanoindentation mapping with 144 indents is conducted to collect creep data from all types of diverse microstructures, followed by systematical calculations based on power-law analysis. Then intuitive contour maps of nanohardness (H), strain rate (ε˙) and stress exponent (n) are attained. 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This work verifies that nanoindentation creep behavior is highly correlated with local microstructure features, and the mapping approach is feasible for evaluating creep-resistance of locally diverse microstructures under extremely high-stress conditions. •High-throughput nanoindentation tests are conducted on an interstitial high-entropy alloy with diverse microstructure features.•Nanoindentation mapping including nanohardness (H), strain rate (ε˙) and stress exponent (n) uncovers the individual creep behavior of each microstructural variant.•Correlated the value of H, ε˙ and n with local microstructures of all indent positions, the creep mechanisms originating from each assembly of microstructural variants are elucidated.•Dominant creep mechanisms of all indents convert from diffusion-mediated model to dislocation-controlled one with the increase of n value.•This work provides an approach to efficiently probe the creep behavior of materials with diverse microstructures at the nanoscale.</description><identifier>ISSN: 0921-5093</identifier><identifier>EISSN: 1873-4936</identifier><identifier>DOI: 10.1016/j.msea.2022.143988</identifier><language>eng</language><publisher>Lausanne: Elsevier B.V</publisher><subject>Cold rolling ; Contact melting ; Contours ; Creep mechanism ; Creep strength ; Diffusion ; Dislocation density ; Diverse microstructures ; High entropy alloys ; High-entropy alloy ; Mapping ; Mechanical systems ; Melting points ; Microstructure ; Nanohardness ; Nanoindentation ; Plastic deformation ; Room temperature ; Strain rate</subject><ispartof>Materials science &amp; engineering. 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A, Structural materials : properties, microstructure and processing</title><description>Time-dependent plastic deformation, also known as creep, can occur in high-melting-point materials at room temperature when subjected to submicron plastic contact (e.g., components in micro-electronic mechanical systems) due to the extremely high stress conditions. Previous investigations of creep behavior at submicron scale mainly focus on uniform microstructures, whereas recently developed high-performance structural materials usually show complex microstructural heterogeneities. Here, we demonstrate a high-throughput nanoindentation approach to unveil the creep behavior of locally diverse microstructures, via a case study on an interstitial high-entropy alloy (iHEA). The prototype iHEA specimen was firstly pre-strained by severe cold-rolling to achieve diverse microstructure features including dense dislocations, nanotwins and nanograins. 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This work verifies that nanoindentation creep behavior is highly correlated with local microstructure features, and the mapping approach is feasible for evaluating creep-resistance of locally diverse microstructures under extremely high-stress conditions. •High-throughput nanoindentation tests are conducted on an interstitial high-entropy alloy with diverse microstructure features.•Nanoindentation mapping including nanohardness (H), strain rate (ε˙) and stress exponent (n) uncovers the individual creep behavior of each microstructural variant.•Correlated the value of H, ε˙ and n with local microstructures of all indent positions, the creep mechanisms originating from each assembly of microstructural variants are elucidated.•Dominant creep mechanisms of all indents convert from diffusion-mediated model to dislocation-controlled one with the increase of n value.•This work provides an approach to efficiently probe the creep behavior of materials with diverse microstructures at the nanoscale.</description><subject>Cold rolling</subject><subject>Contact melting</subject><subject>Contours</subject><subject>Creep mechanism</subject><subject>Creep strength</subject><subject>Diffusion</subject><subject>Dislocation density</subject><subject>Diverse microstructures</subject><subject>High entropy alloys</subject><subject>High-entropy alloy</subject><subject>Mapping</subject><subject>Mechanical systems</subject><subject>Melting points</subject><subject>Microstructure</subject><subject>Nanohardness</subject><subject>Nanoindentation</subject><subject>Plastic deformation</subject><subject>Room temperature</subject><subject>Strain rate</subject><issn>0921-5093</issn><issn>1873-4936</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2022</creationdate><recordtype>article</recordtype><recordid>eNp9kM1KxDAUhYMoOI6-gKuA6475aSctuJHBPxh0o-uQpjfTlE5Sk3RgXsDntkNdu7pwOOfcez-EbilZUULX991qH0GtGGFsRXNeleUZWtBS8Cyv-PocLUjFaFaQil-iqxg7QgjNSbFAP-_KeesacEkl6x3WAWDANbTqYH3A3uDGHiBEwHurg48pjDqNASK2Dis8BMgmTVkHzaSkyZlssqrHrd212VQb_HDEqu_9EdfHWU1t8OOuHcaE92oYrNtdowuj-gg3f3OJvp6fPjev2fbj5W3zuM00Z2XKarpWlVhDyQXUeW2YMaIpKOQir3NBlC7yWhNBODBloKGCN5WpOVMlFVAIw5fobu4dgv8eISbZ-TG4aaVkoqgEJZxXk4vNrtPDMYCRQ7B7FY6SEnniLTt54i1PvOXMewo9zCGY7j9YCDJqC05DYwPoJBtv_4v_AgWXjWA</recordid><startdate>20221020</startdate><enddate>20221020</enddate><creator>Fan, Qimeng</creator><creator>Gan, Kefu</creator><creator>Yan, Dingshun</creator><creator>Li, Zhiming</creator><general>Elsevier B.V</general><general>Elsevier BV</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><orcidid>https://orcid.org/0000-0002-8170-5621</orcidid><orcidid>https://orcid.org/0000-0001-5680-2094</orcidid></search><sort><creationdate>20221020</creationdate><title>Nanoindentation creep behavior of diverse microstructures in a pre-strained interstitial high-entropy alloy by high-throughput mapping</title><author>Fan, Qimeng ; Gan, Kefu ; Yan, Dingshun ; Li, Zhiming</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c328t-b16a976e837eb4bf2ff7d51e474b470ac54bc0703e2afed173d9fb32a817e57f3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2022</creationdate><topic>Cold rolling</topic><topic>Contact melting</topic><topic>Contours</topic><topic>Creep mechanism</topic><topic>Creep strength</topic><topic>Diffusion</topic><topic>Dislocation density</topic><topic>Diverse microstructures</topic><topic>High entropy alloys</topic><topic>High-entropy alloy</topic><topic>Mapping</topic><topic>Mechanical systems</topic><topic>Melting points</topic><topic>Microstructure</topic><topic>Nanohardness</topic><topic>Nanoindentation</topic><topic>Plastic deformation</topic><topic>Room temperature</topic><topic>Strain rate</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Fan, Qimeng</creatorcontrib><creatorcontrib>Gan, Kefu</creatorcontrib><creatorcontrib>Yan, Dingshun</creatorcontrib><creatorcontrib>Li, Zhiming</creatorcontrib><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>Materials science &amp; engineering. 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A, Structural materials : properties, microstructure and processing</jtitle><date>2022-10-20</date><risdate>2022</risdate><volume>856</volume><spage>143988</spage><pages>143988-</pages><artnum>143988</artnum><issn>0921-5093</issn><eissn>1873-4936</eissn><abstract>Time-dependent plastic deformation, also known as creep, can occur in high-melting-point materials at room temperature when subjected to submicron plastic contact (e.g., components in micro-electronic mechanical systems) due to the extremely high stress conditions. Previous investigations of creep behavior at submicron scale mainly focus on uniform microstructures, whereas recently developed high-performance structural materials usually show complex microstructural heterogeneities. Here, we demonstrate a high-throughput nanoindentation approach to unveil the creep behavior of locally diverse microstructures, via a case study on an interstitial high-entropy alloy (iHEA). The prototype iHEA specimen was firstly pre-strained by severe cold-rolling to achieve diverse microstructure features including dense dislocations, nanotwins and nanograins. Nanoindentation mapping with 144 indents is conducted to collect creep data from all types of diverse microstructures, followed by systematical calculations based on power-law analysis. Then intuitive contour maps of nanohardness (H), strain rate (ε˙) and stress exponent (n) are attained. The individual creep mechanism of each microstructure variant is evaluated by correlating local microstructure features with corresponding creep responses from these contour maps. With the increase of n value for different sample regions, the ε˙ value inversely reduces and the corresponding dominant creep mechanism gradually converts from diffusion-mediated mode to dislocation-controlled one. The presence of nanograins and nanotwins significantly hinders dislocation interactions and promotes stress-induced diffusion. 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ispartof Materials science & engineering. A, Structural materials : properties, microstructure and processing, 2022-10, Vol.856, p.143988, Article 143988
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1873-4936
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source Elsevier ScienceDirect Journals
subjects Cold rolling
Contact melting
Contours
Creep mechanism
Creep strength
Diffusion
Dislocation density
Diverse microstructures
High entropy alloys
High-entropy alloy
Mapping
Mechanical systems
Melting points
Microstructure
Nanohardness
Nanoindentation
Plastic deformation
Room temperature
Strain rate
title Nanoindentation creep behavior of diverse microstructures in a pre-strained interstitial high-entropy alloy by high-throughput mapping
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