Altering tensile and crack initiation behavior in a metastable β titanium alloy via designing grain size and precipitates
Microstructure can play a vital role in defining mechanical properties of metallic materials. To elucidate this correlation in the case of Ti–15Mo–3Nb–3Al-0.2Si (TB8) alloy, herein, we designed various microstructures via heat treatment exploring the effects of grain size, precipitates and segregati...
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2024-11-01
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| author | Chun Yuan Dan Liu Xingchen Xu Junfeng Cui Yongkai Peng Chaowen Huang Sara Bagherifard |
| author_facet | Chun Yuan Dan Liu Xingchen Xu Junfeng Cui Yongkai Peng Chaowen Huang Sara Bagherifard |
| author_sort | Chun Yuan |
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| description | Microstructure can play a vital role in defining mechanical properties of metallic materials. To elucidate this correlation in the case of Ti–15Mo–3Nb–3Al-0.2Si (TB8) alloy, herein, we designed various microstructures via heat treatment exploring the effects of grain size, precipitates and segregation on crack initiation behavior during tensile tests in metastable β-Ti alloy. After solution treatment at 830 °C, the TB8 alloy with equiaxed β grain displayed a good fracture elongation of 30.2 ± 0.63%. The adiabatic shearing band and β→α phase transformation were activated to increase the compatible deformation capability during tensile testing; however, the phase transformation caused the stress concentration in the boundary, resulting in crack initiation. For the samples prepared using solution and low aging at 440 °C, large grain, elements segregation at grain boundary and incomplete precipitates induced a slight reduction in ultimate tensile strength and elongation. After solution and aging at 520 °C, the short-rod or/and lamellar α phase precipitated in β grain effectively enhancing ultimate tensile strength (1398.71 ± 15.6 MPa). The increased boundaries provided the interface or precipitation strengthening effect, but high-density dislocations were also accumulated at the β/α interface, causing unstable deformation and crack initiation. These findings advance our understanding of the correlation between microstructure and crack initiation, and provide a basis for designing and customizing the mechanical properties of metastable β-Ti alloy. |
| format | Article |
| id | doaj-art-6a1eee1c2fa5482ab01b13cfcd851c08 |
| institution | Kabale University |
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| language | English |
| publishDate | 2024-11-01 |
| publisher | Elsevier |
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| series | Journal of Materials Research and Technology |
| spelling | doaj-art-6a1eee1c2fa5482ab01b13cfcd851c082024-12-26T08:53:33ZengElsevierJournal of Materials Research and Technology2238-78542024-11-01333950Altering tensile and crack initiation behavior in a metastable β titanium alloy via designing grain size and precipitatesChun Yuan0Dan Liu1Xingchen Xu2Junfeng Cui3Yongkai Peng4Chaowen Huang5Sara Bagherifard6National & Local Joint Engineering Laboratory for High-Performance Metal Structure Materials and Advanced Manufacturing Technology, Guizhou University, Guiyang, 550025, ChinaNational & Local Joint Engineering Laboratory for High-Performance Metal Structure Materials and Advanced Manufacturing Technology, Guizhou University, Guiyang, 550025, China; Corresponding author.Highway School, Chang'an University, Xi'an, 710064, ChinaPublic Technology Center, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, ChinaNational & Local Joint Engineering Laboratory for High-Performance Metal Structure Materials and Advanced Manufacturing Technology, Guizhou University, Guiyang, 550025, ChinaNational & Local Joint Engineering Laboratory for High-Performance Metal Structure Materials and Advanced Manufacturing Technology, Guizhou University, Guiyang, 550025, ChinaDepartment of Mechanical Engineering, Politecnico di Milano, Milan, 20156, ItalyMicrostructure can play a vital role in defining mechanical properties of metallic materials. To elucidate this correlation in the case of Ti–15Mo–3Nb–3Al-0.2Si (TB8) alloy, herein, we designed various microstructures via heat treatment exploring the effects of grain size, precipitates and segregation on crack initiation behavior during tensile tests in metastable β-Ti alloy. After solution treatment at 830 °C, the TB8 alloy with equiaxed β grain displayed a good fracture elongation of 30.2 ± 0.63%. The adiabatic shearing band and β→α phase transformation were activated to increase the compatible deformation capability during tensile testing; however, the phase transformation caused the stress concentration in the boundary, resulting in crack initiation. For the samples prepared using solution and low aging at 440 °C, large grain, elements segregation at grain boundary and incomplete precipitates induced a slight reduction in ultimate tensile strength and elongation. After solution and aging at 520 °C, the short-rod or/and lamellar α phase precipitated in β grain effectively enhancing ultimate tensile strength (1398.71 ± 15.6 MPa). The increased boundaries provided the interface or precipitation strengthening effect, but high-density dislocations were also accumulated at the β/α interface, causing unstable deformation and crack initiation. These findings advance our understanding of the correlation between microstructure and crack initiation, and provide a basis for designing and customizing the mechanical properties of metastable β-Ti alloy.http://www.sciencedirect.com/science/article/pii/S2238785424020581TB8 alloyβ grainPrecipitateElements segregationCrack initiationTensile test |
| spellingShingle | Chun Yuan Dan Liu Xingchen Xu Junfeng Cui Yongkai Peng Chaowen Huang Sara Bagherifard Altering tensile and crack initiation behavior in a metastable β titanium alloy via designing grain size and precipitates Journal of Materials Research and Technology TB8 alloy β grain Precipitate Elements segregation Crack initiation Tensile test |
| title | Altering tensile and crack initiation behavior in a metastable β titanium alloy via designing grain size and precipitates |
| title_full | Altering tensile and crack initiation behavior in a metastable β titanium alloy via designing grain size and precipitates |
| title_fullStr | Altering tensile and crack initiation behavior in a metastable β titanium alloy via designing grain size and precipitates |
| title_full_unstemmed | Altering tensile and crack initiation behavior in a metastable β titanium alloy via designing grain size and precipitates |
| title_short | Altering tensile and crack initiation behavior in a metastable β titanium alloy via designing grain size and precipitates |
| title_sort | altering tensile and crack initiation behavior in a metastable β titanium alloy via designing grain size and precipitates |
| topic | TB8 alloy β grain Precipitate Elements segregation Crack initiation Tensile test |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424020581 |
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