Role of Cu addition in enhancing strength-ductility synergy in transforming high entropy alloy
The mechanical properties of transformation induced plasticity high entropy alloys (TRIP HEAs) are affected by tailoring the metastability via alloying and processing. The current work focuses on as-cast and friction stir processed alloy where the initial microstructure is altered by Cu addition (a...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-03-01
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| Series: | Materials & Design |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127522001083 |
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| author | Priyanka Agrawal Sanya Gupta Shivakant Shukla Saurabh S. Nene Saket Thapliyal Michael P. Toll Rajiv S. Mishra |
| author_facet | Priyanka Agrawal Sanya Gupta Shivakant Shukla Saurabh S. Nene Saket Thapliyal Michael P. Toll Rajiv S. Mishra |
| author_sort | Priyanka Agrawal |
| collection | DOAJ |
| description | The mechanical properties of transformation induced plasticity high entropy alloys (TRIP HEAs) are affected by tailoring the metastability via alloying and processing. The current work focuses on as-cast and friction stir processed alloy where the initial microstructure is altered by Cu addition (a γ-fcc phase stabilizer) to the ε-hcp dominated HEA. With the Cu addition, the tensile stress-strain curves exhibited improved ductility and a delay in TRIP effect, suggesting an increased stacking fault energy, along with improved strength and work hardening. Improved properties with Cu addition are credited to almost 100% stabilized γ-fcc phase, increased type and number of interfaces: Cu-rich precipitates, shorter faults, phase separation, and increased grain boundary fraction. The new alloy was then friction stir processed (FSPed) to further improve the properties. An advanced TRIP effect is observed with FSP as compared to as-cast alloy, attributed to increased ε-hcp fraction and finer grain size. Based on microscopic observations, the improved strength is due to finer grain size, increased dislocation density, low density of faults, whereas reduced ductility is reasoned to be due to dissolution of Cu-rich precipitates and increased width of modulations from phase separation. |
| first_indexed | 2024-04-12T22:26:22Z |
| format | Article |
| id | doaj.art-8cab9f2e0d6e4b09827e095fc1ab6617 |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-04-12T22:26:22Z |
| publishDate | 2022-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-8cab9f2e0d6e4b09827e095fc1ab66172022-12-22T03:14:08ZengElsevierMaterials & Design0264-12752022-03-01215110487Role of Cu addition in enhancing strength-ductility synergy in transforming high entropy alloyPriyanka Agrawal0Sanya Gupta1Shivakant Shukla2Saurabh S. Nene3Saket Thapliyal4Michael P. Toll5Rajiv S. Mishra6Center for Friction Stir Processing, Department of Materials Science and Engineering, University of North Texas, Denton, TX 76207, USA; Advanced Materials and Manufacturing Processes Institute, University of North Texas, Denton, TX 76207, USACenter for Friction Stir Processing, Department of Materials Science and Engineering, University of North Texas, Denton, TX 76207, USACenter for Friction Stir Processing, Department of Materials Science and Engineering, University of North Texas, Denton, TX 76207, USA; Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USACenter for Friction Stir Processing, Department of Materials Science and Engineering, University of North Texas, Denton, TX 76207, USA; Department of Metallurgical and Materials Engineering, Indian Institute of Technology Jodhpur, Karwar, Jodhpur, Rajasthan 342037, INDIACenter for Friction Stir Processing, Department of Materials Science and Engineering, University of North Texas, Denton, TX 76207, USA; Advanced Materials and Manufacturing Processes Institute, University of North Texas, Denton, TX 76207, USACenter for Friction Stir Processing, Department of Materials Science and Engineering, University of North Texas, Denton, TX 76207, USACenter for Friction Stir Processing, Department of Materials Science and Engineering, University of North Texas, Denton, TX 76207, USA; Advanced Materials and Manufacturing Processes Institute, University of North Texas, Denton, TX 76207, USA; Corresponding author.The mechanical properties of transformation induced plasticity high entropy alloys (TRIP HEAs) are affected by tailoring the metastability via alloying and processing. The current work focuses on as-cast and friction stir processed alloy where the initial microstructure is altered by Cu addition (a γ-fcc phase stabilizer) to the ε-hcp dominated HEA. With the Cu addition, the tensile stress-strain curves exhibited improved ductility and a delay in TRIP effect, suggesting an increased stacking fault energy, along with improved strength and work hardening. Improved properties with Cu addition are credited to almost 100% stabilized γ-fcc phase, increased type and number of interfaces: Cu-rich precipitates, shorter faults, phase separation, and increased grain boundary fraction. The new alloy was then friction stir processed (FSPed) to further improve the properties. An advanced TRIP effect is observed with FSP as compared to as-cast alloy, attributed to increased ε-hcp fraction and finer grain size. Based on microscopic observations, the improved strength is due to finer grain size, increased dislocation density, low density of faults, whereas reduced ductility is reasoned to be due to dissolution of Cu-rich precipitates and increased width of modulations from phase separation.http://www.sciencedirect.com/science/article/pii/S0264127522001083High entropy alloysTensile propertiesStacking faultsFriction stir processingTransmission electron microscopyPhase separation |
| spellingShingle | Priyanka Agrawal Sanya Gupta Shivakant Shukla Saurabh S. Nene Saket Thapliyal Michael P. Toll Rajiv S. Mishra Role of Cu addition in enhancing strength-ductility synergy in transforming high entropy alloy Materials & Design High entropy alloys Tensile properties Stacking faults Friction stir processing Transmission electron microscopy Phase separation |
| title | Role of Cu addition in enhancing strength-ductility synergy in transforming high entropy alloy |
| title_full | Role of Cu addition in enhancing strength-ductility synergy in transforming high entropy alloy |
| title_fullStr | Role of Cu addition in enhancing strength-ductility synergy in transforming high entropy alloy |
| title_full_unstemmed | Role of Cu addition in enhancing strength-ductility synergy in transforming high entropy alloy |
| title_short | Role of Cu addition in enhancing strength-ductility synergy in transforming high entropy alloy |
| title_sort | role of cu addition in enhancing strength ductility synergy in transforming high entropy alloy |
| topic | High entropy alloys Tensile properties Stacking faults Friction stir processing Transmission electron microscopy Phase separation |
| url | http://www.sciencedirect.com/science/article/pii/S0264127522001083 |
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