Plasticity induced by nanoindentation in a CrCoNi medium-entropy alloy studied by accurate electron channeling contrast imaging revealing dislocation-low angle grain boundary interactions
In the present work, interactions of nanoindentation-induced dislocations (NIDs) with a low-angle grain boundary (LAGB) are investigated in a single-crystalline CrCoNi medium-entropy alloy (MEA). Microstructural evolutions before and after nanoindentation were examined using accurate electron channe...
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| Veröffentlicht in: | Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2021-06, Vol.817, p.141364, Article 141364 |
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| creator | Habiyaremye, Frederic Guitton, Antoine Schäfer, Florian Scholz, Felicitas Schneider, Mike Frenzel, Jan Laplanche, Guillaume Maloufi, Nabila |
| description | In the present work, interactions of nanoindentation-induced dislocations (NIDs) with a low-angle grain boundary (LAGB) are investigated in a single-crystalline CrCoNi medium-entropy alloy (MEA). Microstructural evolutions before and after nanoindentation were examined using accurate electron channeling contrast imaging (A-ECCI). In the as-grown state, the alloy microstructure consists of subgrains separated by LAGBs. After nanoindentation on the (001) plane far away from LAGBs, the load-displacement curves exhibit the typical behavior of metals and alloys with a pop-in marking the elastic-plastic transition. This pop-in is related to the nucleation of NIDs that are observed to form pile-ups on {111} planes. In contrast, when indents are performed in the vicinity of a LAGB with a low misorientation angle of 0.24° and consisting of dislocations spaced ~60 nm apart, different micromechanical responses and deformation mechanisms are observed depending on the distance between the LAGB and the nanoindenter tip. When the distance between the LAGB and the nanoindenter tip is larger than four times the size of the indent (corresponding ratio: R > 4), the LAGB does not affect the micromechanical response nor interact with NIDs. In contrast, when the indenter comes in direct or indirect contact with the LAGB (R |
| doi_str_mv | 10.1016/j.msea.2021.141364 |
| format | Article |
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Microstructural evolutions before and after nanoindentation were examined using accurate electron channeling contrast imaging (A-ECCI). In the as-grown state, the alloy microstructure consists of subgrains separated by LAGBs. After nanoindentation on the (001) plane far away from LAGBs, the load-displacement curves exhibit the typical behavior of metals and alloys with a pop-in marking the elastic-plastic transition. This pop-in is related to the nucleation of NIDs that are observed to form pile-ups on {111} planes. In contrast, when indents are performed in the vicinity of a LAGB with a low misorientation angle of 0.24° and consisting of dislocations spaced ~60 nm apart, different micromechanical responses and deformation mechanisms are observed depending on the distance between the LAGB and the nanoindenter tip. When the distance between the LAGB and the nanoindenter tip is larger than four times the size of the indent (corresponding ratio: R > 4), the LAGB does not affect the micromechanical response nor interact with NIDs. In contrast, when the indenter comes in direct or indirect contact with the LAGB (R < 1), the load-displacement curve deviates at low loads from the elastic stage, and pop-ins are not observed. In this case, the continuous deformation is accommodated by the movement of the pre-existing LAGB dislocations. For intermediate cases with 1 < R < 4, the load of the initial pop-in is dependent on the local defect density. In this latter case, the pile-ups of NIDs directly impinge on the LAGB. Microstructural analyses reveal that the LAGB accommodates plasticity by blocking the NIDs, activating a dislocation nucleation site in the adjacent subgrain/emission of dislocation from the LAGB, and inducing slight motions of its constituent dislocations.</description><identifier>ISSN: 0921-5093</identifier><identifier>EISSN: 1873-4936</identifier><identifier>DOI: 10.1016/j.msea.2021.141364</identifier><language>eng</language><publisher>Lausanne: Elsevier B.V</publisher><subject>A-ECCI ; Alloys ; Channeling ; Condensed Matter ; Deformation mechanisms ; Dislocations ; Engineering Sciences ; Entropy ; Grain boundaries ; Low-angle grain boundary ; Materials ; Materials and structures in mechanics ; Mechanics ; Medium entropy alloys ; Microstructure ; Misalignment ; Nanoindentation ; Nanoindenters ; NiCoCr medium-entropy alloy ; Nucleation ; Physics ; Plastic properties ; Single crystals</subject><ispartof>Materials science & engineering. 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A, Structural materials : properties, microstructure and processing</title><description>In the present work, interactions of nanoindentation-induced dislocations (NIDs) with a low-angle grain boundary (LAGB) are investigated in a single-crystalline CrCoNi medium-entropy alloy (MEA). Microstructural evolutions before and after nanoindentation were examined using accurate electron channeling contrast imaging (A-ECCI). In the as-grown state, the alloy microstructure consists of subgrains separated by LAGBs. After nanoindentation on the (001) plane far away from LAGBs, the load-displacement curves exhibit the typical behavior of metals and alloys with a pop-in marking the elastic-plastic transition. This pop-in is related to the nucleation of NIDs that are observed to form pile-ups on {111} planes. In contrast, when indents are performed in the vicinity of a LAGB with a low misorientation angle of 0.24° and consisting of dislocations spaced ~60 nm apart, different micromechanical responses and deformation mechanisms are observed depending on the distance between the LAGB and the nanoindenter tip. When the distance between the LAGB and the nanoindenter tip is larger than four times the size of the indent (corresponding ratio: R > 4), the LAGB does not affect the micromechanical response nor interact with NIDs. In contrast, when the indenter comes in direct or indirect contact with the LAGB (R < 1), the load-displacement curve deviates at low loads from the elastic stage, and pop-ins are not observed. In this case, the continuous deformation is accommodated by the movement of the pre-existing LAGB dislocations. For intermediate cases with 1 < R < 4, the load of the initial pop-in is dependent on the local defect density. In this latter case, the pile-ups of NIDs directly impinge on the LAGB. Microstructural analyses reveal that the LAGB accommodates plasticity by blocking the NIDs, activating a dislocation nucleation site in the adjacent subgrain/emission of dislocation from the LAGB, and inducing slight motions of its constituent dislocations.</description><subject>A-ECCI</subject><subject>Alloys</subject><subject>Channeling</subject><subject>Condensed Matter</subject><subject>Deformation mechanisms</subject><subject>Dislocations</subject><subject>Engineering Sciences</subject><subject>Entropy</subject><subject>Grain boundaries</subject><subject>Low-angle grain boundary</subject><subject>Materials</subject><subject>Materials and structures in mechanics</subject><subject>Mechanics</subject><subject>Medium entropy alloys</subject><subject>Microstructure</subject><subject>Misalignment</subject><subject>Nanoindentation</subject><subject>Nanoindenters</subject><subject>NiCoCr medium-entropy alloy</subject><subject>Nucleation</subject><subject>Physics</subject><subject>Plastic properties</subject><subject>Single crystals</subject><issn>0921-5093</issn><issn>1873-4936</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><recordid>eNp9UcFu1DAQjRCVWFp-gJMlThyyeBInjSUu1Qoo0gp6gLM1sSdbr7z2YieL8m39OZwGceRkeea9eW_mFcVb4Fvg0H44bk-JcFvxCrYgoG7Fi2ID3W1dClm3L4sNlxWUDZf1q-J1SkfOOQjebIqnB4dptNqOM7PeTJoM62fm0Yf8JT_iaIPPLYZsF3fhm2UnMnY6lbkXw3lm6FyYWRonY1cuaj1FHImRI50xnulH9J6c9QemQ6ZlRWZPeFgKkS6Ezy1jkwv6Wa904TdDf3DEDhGzeB8mbzAuHkeKqBdQuimuBnSJ3vx9r4ufnz_92N2X--9fvu7u9qUWvB3Ljqqqb7RuW8SW-ADCmKYWCIQVAIrbOh9HysEMDe-7DkVNA0rseik0aMT6uni_zn1Ep84xO4-zCmjV_d1eLTVeA3RS8gtk7LsVe47h10RpVMcwRZ_tqapppYCKtyKjqhWlY0gp0vBvLHC1BKqOaglULYGqNdBM-riSKO96sRRV0pZ8TszGfGhlgv0f_Q_nGq6o</recordid><startdate>20210610</startdate><enddate>20210610</enddate><creator>Habiyaremye, Frederic</creator><creator>Guitton, Antoine</creator><creator>Schäfer, Florian</creator><creator>Scholz, Felicitas</creator><creator>Schneider, Mike</creator><creator>Frenzel, Jan</creator><creator>Laplanche, Guillaume</creator><creator>Maloufi, Nabila</creator><general>Elsevier B.V</general><general>Elsevier BV</general><general>Elsevier</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>1XC</scope><scope>VOOES</scope><orcidid>https://orcid.org/0000-0002-9996-6571</orcidid><orcidid>https://orcid.org/0000-0002-1508-787X</orcidid><orcidid>https://orcid.org/0000-0001-9559-0928</orcidid><orcidid>https://orcid.org/0000-0002-8329-5742</orcidid><orcidid>https://orcid.org/0000-0001-6133-4280</orcidid></search><sort><creationdate>20210610</creationdate><title>Plasticity induced by nanoindentation in a CrCoNi medium-entropy alloy studied by accurate electron channeling contrast imaging revealing dislocation-low angle grain boundary interactions</title><author>Habiyaremye, Frederic ; Guitton, Antoine ; Schäfer, Florian ; Scholz, Felicitas ; Schneider, Mike ; Frenzel, Jan ; Laplanche, Guillaume ; Maloufi, Nabila</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c406t-8e22b5cc66aa6e0f14dd534a1ea211a47309299fdf50b88a43efa9a8b94c1caa3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2021</creationdate><topic>A-ECCI</topic><topic>Alloys</topic><topic>Channeling</topic><topic>Condensed Matter</topic><topic>Deformation mechanisms</topic><topic>Dislocations</topic><topic>Engineering Sciences</topic><topic>Entropy</topic><topic>Grain boundaries</topic><topic>Low-angle grain boundary</topic><topic>Materials</topic><topic>Materials and structures in mechanics</topic><topic>Mechanics</topic><topic>Medium entropy alloys</topic><topic>Microstructure</topic><topic>Misalignment</topic><topic>Nanoindentation</topic><topic>Nanoindenters</topic><topic>NiCoCr medium-entropy alloy</topic><topic>Nucleation</topic><topic>Physics</topic><topic>Plastic properties</topic><topic>Single crystals</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Habiyaremye, Frederic</creatorcontrib><creatorcontrib>Guitton, Antoine</creatorcontrib><creatorcontrib>Schäfer, Florian</creatorcontrib><creatorcontrib>Scholz, Felicitas</creatorcontrib><creatorcontrib>Schneider, Mike</creatorcontrib><creatorcontrib>Frenzel, Jan</creatorcontrib><creatorcontrib>Laplanche, Guillaume</creatorcontrib><creatorcontrib>Maloufi, Nabila</creatorcontrib><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Hyper Article en Ligne (HAL)</collection><collection>Hyper Article en Ligne (HAL) (Open Access)</collection><jtitle>Materials science & engineering. A, Structural materials : properties, microstructure and processing</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Habiyaremye, Frederic</au><au>Guitton, Antoine</au><au>Schäfer, Florian</au><au>Scholz, Felicitas</au><au>Schneider, Mike</au><au>Frenzel, Jan</au><au>Laplanche, Guillaume</au><au>Maloufi, Nabila</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Plasticity induced by nanoindentation in a CrCoNi medium-entropy alloy studied by accurate electron channeling contrast imaging revealing dislocation-low angle grain boundary interactions</atitle><jtitle>Materials science & engineering. A, Structural materials : properties, microstructure and processing</jtitle><date>2021-06-10</date><risdate>2021</risdate><volume>817</volume><spage>141364</spage><pages>141364-</pages><artnum>141364</artnum><issn>0921-5093</issn><eissn>1873-4936</eissn><abstract>In the present work, interactions of nanoindentation-induced dislocations (NIDs) with a low-angle grain boundary (LAGB) are investigated in a single-crystalline CrCoNi medium-entropy alloy (MEA). Microstructural evolutions before and after nanoindentation were examined using accurate electron channeling contrast imaging (A-ECCI). In the as-grown state, the alloy microstructure consists of subgrains separated by LAGBs. After nanoindentation on the (001) plane far away from LAGBs, the load-displacement curves exhibit the typical behavior of metals and alloys with a pop-in marking the elastic-plastic transition. This pop-in is related to the nucleation of NIDs that are observed to form pile-ups on {111} planes. In contrast, when indents are performed in the vicinity of a LAGB with a low misorientation angle of 0.24° and consisting of dislocations spaced ~60 nm apart, different micromechanical responses and deformation mechanisms are observed depending on the distance between the LAGB and the nanoindenter tip. When the distance between the LAGB and the nanoindenter tip is larger than four times the size of the indent (corresponding ratio: R > 4), the LAGB does not affect the micromechanical response nor interact with NIDs. In contrast, when the indenter comes in direct or indirect contact with the LAGB (R < 1), the load-displacement curve deviates at low loads from the elastic stage, and pop-ins are not observed. In this case, the continuous deformation is accommodated by the movement of the pre-existing LAGB dislocations. For intermediate cases with 1 < R < 4, the load of the initial pop-in is dependent on the local defect density. In this latter case, the pile-ups of NIDs directly impinge on the LAGB. Microstructural analyses reveal that the LAGB accommodates plasticity by blocking the NIDs, activating a dislocation nucleation site in the adjacent subgrain/emission of dislocation from the LAGB, and inducing slight motions of its constituent dislocations.</abstract><cop>Lausanne</cop><pub>Elsevier B.V</pub><doi>10.1016/j.msea.2021.141364</doi><orcidid>https://orcid.org/0000-0002-9996-6571</orcidid><orcidid>https://orcid.org/0000-0002-1508-787X</orcidid><orcidid>https://orcid.org/0000-0001-9559-0928</orcidid><orcidid>https://orcid.org/0000-0002-8329-5742</orcidid><orcidid>https://orcid.org/0000-0001-6133-4280</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | A-ECCI Alloys Channeling Condensed Matter Deformation mechanisms Dislocations Engineering Sciences Entropy Grain boundaries Low-angle grain boundary Materials Materials and structures in mechanics Mechanics Medium entropy alloys Microstructure Misalignment Nanoindentation Nanoindenters NiCoCr medium-entropy alloy Nucleation Physics Plastic properties Single crystals |
| title | Plasticity induced by nanoindentation in a CrCoNi medium-entropy alloy studied by accurate electron channeling contrast imaging revealing dislocation-low angle grain boundary interactions |
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