Effect of boron on microstructure and mechanical properties of cast Ti-44Al6-Nb ingots
In order to improve the mechanical properties of TiAl alloys, especially the ductility at room temperature, and to study the effect of boron (B) on TiAl alloys, different contents (0, 0.1, 0.3, 0.6, 0.9, 1.2, at.%) of B were added into Ti-44Al-6Nb alloys to prepare ingots. The surface quality, macro...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Foundry Journal Agency
2015-01-01
|
| Series: | China Foundry |
| Subjects: | |
| Online Access: | http://foundryworld.com/uploadfile/2015021238703325.pdf |
| _version_ | 1818941763334701056 |
|---|---|
| author | Jian-chong Li Rui-run Chen Zhi-kun Ma |
| author_facet | Jian-chong Li Rui-run Chen Zhi-kun Ma |
| author_sort | Jian-chong Li |
| collection | DOAJ |
| description | In order to improve the mechanical properties of TiAl alloys, especially the ductility at room temperature, and to study the effect of boron (B) on TiAl alloys, different contents (0, 0.1, 0.3, 0.6, 0.9, 1.2, at.%) of B were added into Ti-44Al-6Nb alloys to prepare ingots. The surface quality, macrostructure, microstructure, compressive properties and fracture surface of the ingots were studied. The results show that B has little influence on the surface quality except that there are some dark spots on the surface when the content of B is 0.9%. B can refine the grains. The average grain size decrease from about 0.8 mm to 0.088 mm with increasing B content. Meanwhile, the grain morphology of these ingots changes from big equiaxed grains with lamellars to fine equiaxed grains. When the content of B is 1.2%, the primary TiB2 phase forms in the liquid phase and increases the nucleation rate, leading to further refinement of the grains. The compressive testing results show that B can increase the strength and the ductility, the compressive strength and compressibility can reach 2,037.8 MPa and 26.7% from 1,156.2 MPa and 10.2% when the boron content is 0.6%, which is resulted from grain refining and grain boundary strengthening. It is found that the compressive strength and the compressibility are relatively stable when the B content is more than 0.3%. |
| first_indexed | 2024-12-20T07:00:42Z |
| format | Article |
| id | doaj.art-91db141ee596431bb7010209c2a06bbb |
| institution | Directory Open Access Journal |
| issn | 1672-6421 1672-6421 |
| language | English |
| last_indexed | 2024-12-20T07:00:42Z |
| publishDate | 2015-01-01 |
| publisher | Foundry Journal Agency |
| record_format | Article |
| series | China Foundry |
| spelling | doaj.art-91db141ee596431bb7010209c2a06bbb2022-12-21T19:49:12ZengFoundry Journal AgencyChina Foundry1672-64211672-64212015-01-01121914Effect of boron on microstructure and mechanical properties of cast Ti-44Al6-Nb ingotsJian-chong Li0Rui-run Chen1 Zhi-kun Ma2AVIC Beijing Institute of Aeronautical Materials, Beijing 100095, ChinaSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaIn order to improve the mechanical properties of TiAl alloys, especially the ductility at room temperature, and to study the effect of boron (B) on TiAl alloys, different contents (0, 0.1, 0.3, 0.6, 0.9, 1.2, at.%) of B were added into Ti-44Al-6Nb alloys to prepare ingots. The surface quality, macrostructure, microstructure, compressive properties and fracture surface of the ingots were studied. The results show that B has little influence on the surface quality except that there are some dark spots on the surface when the content of B is 0.9%. B can refine the grains. The average grain size decrease from about 0.8 mm to 0.088 mm with increasing B content. Meanwhile, the grain morphology of these ingots changes from big equiaxed grains with lamellars to fine equiaxed grains. When the content of B is 1.2%, the primary TiB2 phase forms in the liquid phase and increases the nucleation rate, leading to further refinement of the grains. The compressive testing results show that B can increase the strength and the ductility, the compressive strength and compressibility can reach 2,037.8 MPa and 26.7% from 1,156.2 MPa and 10.2% when the boron content is 0.6%, which is resulted from grain refining and grain boundary strengthening. It is found that the compressive strength and the compressibility are relatively stable when the B content is more than 0.3%.http://foundryworld.com/uploadfile/2015021238703325.pdfboronTiAl alloycompressive propertygrain refining |
| spellingShingle | Jian-chong Li Rui-run Chen Zhi-kun Ma Effect of boron on microstructure and mechanical properties of cast Ti-44Al6-Nb ingots China Foundry boron TiAl alloy compressive property grain refining |
| title | Effect of boron on microstructure and mechanical properties of cast Ti-44Al6-Nb ingots |
| title_full | Effect of boron on microstructure and mechanical properties of cast Ti-44Al6-Nb ingots |
| title_fullStr | Effect of boron on microstructure and mechanical properties of cast Ti-44Al6-Nb ingots |
| title_full_unstemmed | Effect of boron on microstructure and mechanical properties of cast Ti-44Al6-Nb ingots |
| title_short | Effect of boron on microstructure and mechanical properties of cast Ti-44Al6-Nb ingots |
| title_sort | effect of boron on microstructure and mechanical properties of cast ti 44al6 nb ingots |
| topic | boron TiAl alloy compressive property grain refining |
| url | http://foundryworld.com/uploadfile/2015021238703325.pdf |
| work_keys_str_mv | AT jianchongli effectofborononmicrostructureandmechanicalpropertiesofcastti44al6nbingots AT ruirunchen effectofborononmicrostructureandmechanicalpropertiesofcastti44al6nbingots AT zhikunma effectofborononmicrostructureandmechanicalpropertiesofcastti44al6nbingots |