Improvement of the Crack Propagation Resistance in an α + β Titanium Alloy with a Trimodal Microstructure
The roles of microstructure in plastic deformation and crack growth mechanisms of a titanium alloy with a trimodal microstructure have been systematically investigated. The results show that thick intragranular α lath and a small number of equiaxed α phases avoid the nucleation of cracks at the grai...
| Published in: | Metals |
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| Main Authors: | , , , |
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2020-08-01
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| Online Access: | https://www.mdpi.com/2075-4701/10/8/1058 |
| _version_ | 1849879399254458368 |
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| author | Changsheng Tan Yiduo Fan Qiaoyan Sun Guojun Zhang |
| author_facet | Changsheng Tan Yiduo Fan Qiaoyan Sun Guojun Zhang |
| author_sort | Changsheng Tan |
| collection | DOAJ |
| container_title | Metals |
| description | The roles of microstructure in plastic deformation and crack growth mechanisms of a titanium alloy with a trimodal microstructure have been systematically investigated. The results show that thick intragranular α lath and a small number of equiaxed α phases avoid the nucleation of cracks at the grain boundary, resulting in branching and fluctuation of cracks. Based on electron back-scattered diffraction, the strain partition and plastic deformation ahead of the crack tip were observed and analyzed in detail. Due to the toughening effect of the softer equiaxed α phase at the grain boundary, crack arresting and blunting are prevalent, improving the crack growth resistance and generating a relatively superior fracture toughness performance. These results indicate that a small amount of large globular α phases is beneficial to increase the crack propagation resistance and, thus, a good combination of mechanical property is obtained in the trimodal microstructure. |
| format | Article |
| id | doaj-art-835dd1cdbbf04e5789fa4df880bb00a3 |
| institution | Directory of Open Access Journals |
| issn | 2075-4701 |
| language | English |
| publishDate | 2020-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| spelling | doaj-art-835dd1cdbbf04e5789fa4df880bb00a32025-08-20T01:10:24ZengMDPI AGMetals2075-47012020-08-01108105810.3390/met10081058Improvement of the Crack Propagation Resistance in an α + β Titanium Alloy with a Trimodal MicrostructureChangsheng Tan0Yiduo Fan1Qiaoyan Sun2Guojun Zhang3School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, ChinaSchool of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, ChinaState Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, ChinaSchool of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, ChinaThe roles of microstructure in plastic deformation and crack growth mechanisms of a titanium alloy with a trimodal microstructure have been systematically investigated. The results show that thick intragranular α lath and a small number of equiaxed α phases avoid the nucleation of cracks at the grain boundary, resulting in branching and fluctuation of cracks. Based on electron back-scattered diffraction, the strain partition and plastic deformation ahead of the crack tip were observed and analyzed in detail. Due to the toughening effect of the softer equiaxed α phase at the grain boundary, crack arresting and blunting are prevalent, improving the crack growth resistance and generating a relatively superior fracture toughness performance. These results indicate that a small amount of large globular α phases is beneficial to increase the crack propagation resistance and, thus, a good combination of mechanical property is obtained in the trimodal microstructure.https://www.mdpi.com/2075-4701/10/8/1058titanium alloytrimodal microstructuresstrain partitioncrack propagation |
| spellingShingle | Changsheng Tan Yiduo Fan Qiaoyan Sun Guojun Zhang Improvement of the Crack Propagation Resistance in an α + β Titanium Alloy with a Trimodal Microstructure titanium alloy trimodal microstructures strain partition crack propagation |
| title | Improvement of the Crack Propagation Resistance in an α + β Titanium Alloy with a Trimodal Microstructure |
| title_full | Improvement of the Crack Propagation Resistance in an α + β Titanium Alloy with a Trimodal Microstructure |
| title_fullStr | Improvement of the Crack Propagation Resistance in an α + β Titanium Alloy with a Trimodal Microstructure |
| title_full_unstemmed | Improvement of the Crack Propagation Resistance in an α + β Titanium Alloy with a Trimodal Microstructure |
| title_short | Improvement of the Crack Propagation Resistance in an α + β Titanium Alloy with a Trimodal Microstructure |
| title_sort | improvement of the crack propagation resistance in an α β titanium alloy with a trimodal microstructure |
| topic | titanium alloy trimodal microstructures strain partition crack propagation |
| url | https://www.mdpi.com/2075-4701/10/8/1058 |
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