Formation mechanism of titanium solid solution and its influence on equiaxed behavior of α phase of Ti–5Al–5Mo–5Cr–2Zr-xNb alloys
To clarify the formation mechanism of titanium solid solution (Tiss) and its effect on the microstructure, Ti–5Al–5Mo–5Cr–2Zr-xNb alloys are prepared by vacuum induction melting and multi-directional forging (MDF). The results show that the alloy phase is composed of grain boundary α (αGB), primary...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-09-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785423017015 |
| _version_ | 1827780539920154624 |
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| author | Shichen Sun Hongze Fang Yili Li Ruirun Chen Baohui Zhu Jingjie Guo |
| author_facet | Shichen Sun Hongze Fang Yili Li Ruirun Chen Baohui Zhu Jingjie Guo |
| author_sort | Shichen Sun |
| collection | DOAJ |
| description | To clarify the formation mechanism of titanium solid solution (Tiss) and its effect on the microstructure, Ti–5Al–5Mo–5Cr–2Zr-xNb alloys are prepared by vacuum induction melting and multi-directional forging (MDF). The results show that the alloy phase is composed of grain boundary α (αGB), primary α (αp), secondary α (αs) and residual β phases. The crystal structure of Tiss is consistent with that of the β phase. Nb atoms rapidly spread along the dislocations and aggregated to the α phase boundary during MDF, and Nb atoms dissolved in the lattice of the β phase to form Tiss. There are (0002)α∥(3¯21¯)Tiss and (011¯0)α∥(121¯)Tiss orientation between titanium solid solution and equiaxed αp phase. Therefore, the equiaxed behavior of the αp phase is characterized by the formation of new phase boundaries caused by dislocations captured by Tiss. The tensile strength and toughness increased when the Nb content increased from 3 to 9%, which is attributed to the increase in the α phase content and the solid solution strengthening of Nb. When the Nb content increased to 12 wt.%, the tensile strength and toughness decreased due to the debonding of the lamellar αp phase. The equiaxed αp phase improves the plasticity of the titanium alloy, so the strain decreases with decreasing content. |
| first_indexed | 2024-03-11T15:06:49Z |
| format | Article |
| id | doaj.art-64e03795135d4276bfb72801c1e26ed0 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-03-11T15:06:49Z |
| publishDate | 2023-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-64e03795135d4276bfb72801c1e26ed02023-10-30T06:02:38ZengElsevierJournal of Materials Research and Technology2238-78542023-09-0126434444Formation mechanism of titanium solid solution and its influence on equiaxed behavior of α phase of Ti–5Al–5Mo–5Cr–2Zr-xNb alloysShichen Sun0Hongze Fang1Yili Li2Ruirun Chen3Baohui Zhu4Jingjie Guo5National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR ChinaNational Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR China; Corresponding author.National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR ChinaNational Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR China; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China; Corresponding author. National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR China.Ningxia Horizontal Titanium Industry Co., Ltd., Shizuishan City, Ningxia 753000, PR ChinaNational Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR ChinaTo clarify the formation mechanism of titanium solid solution (Tiss) and its effect on the microstructure, Ti–5Al–5Mo–5Cr–2Zr-xNb alloys are prepared by vacuum induction melting and multi-directional forging (MDF). The results show that the alloy phase is composed of grain boundary α (αGB), primary α (αp), secondary α (αs) and residual β phases. The crystal structure of Tiss is consistent with that of the β phase. Nb atoms rapidly spread along the dislocations and aggregated to the α phase boundary during MDF, and Nb atoms dissolved in the lattice of the β phase to form Tiss. There are (0002)α∥(3¯21¯)Tiss and (011¯0)α∥(121¯)Tiss orientation between titanium solid solution and equiaxed αp phase. Therefore, the equiaxed behavior of the αp phase is characterized by the formation of new phase boundaries caused by dislocations captured by Tiss. The tensile strength and toughness increased when the Nb content increased from 3 to 9%, which is attributed to the increase in the α phase content and the solid solution strengthening of Nb. When the Nb content increased to 12 wt.%, the tensile strength and toughness decreased due to the debonding of the lamellar αp phase. The equiaxed αp phase improves the plasticity of the titanium alloy, so the strain decreases with decreasing content.http://www.sciencedirect.com/science/article/pii/S2238785423017015Titanium alloyTitanium solid solutionFormation mechanismMicrostructure evolution |
| spellingShingle | Shichen Sun Hongze Fang Yili Li Ruirun Chen Baohui Zhu Jingjie Guo Formation mechanism of titanium solid solution and its influence on equiaxed behavior of α phase of Ti–5Al–5Mo–5Cr–2Zr-xNb alloys Journal of Materials Research and Technology Titanium alloy Titanium solid solution Formation mechanism Microstructure evolution |
| title | Formation mechanism of titanium solid solution and its influence on equiaxed behavior of α phase of Ti–5Al–5Mo–5Cr–2Zr-xNb alloys |
| title_full | Formation mechanism of titanium solid solution and its influence on equiaxed behavior of α phase of Ti–5Al–5Mo–5Cr–2Zr-xNb alloys |
| title_fullStr | Formation mechanism of titanium solid solution and its influence on equiaxed behavior of α phase of Ti–5Al–5Mo–5Cr–2Zr-xNb alloys |
| title_full_unstemmed | Formation mechanism of titanium solid solution and its influence on equiaxed behavior of α phase of Ti–5Al–5Mo–5Cr–2Zr-xNb alloys |
| title_short | Formation mechanism of titanium solid solution and its influence on equiaxed behavior of α phase of Ti–5Al–5Mo–5Cr–2Zr-xNb alloys |
| title_sort | formation mechanism of titanium solid solution and its influence on equiaxed behavior of α phase of ti 5al 5mo 5cr 2zr xnb alloys |
| topic | Titanium alloy Titanium solid solution Formation mechanism Microstructure evolution |
| url | http://www.sciencedirect.com/science/article/pii/S2238785423017015 |
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