Effect of a High-Temperature Treatment on Structural-Phase State and Mechanical Properties of IMC of the Ti-25Al-25Nb at.% System
In this research, samples of an alloy with a bimodal structure were studied on the basis of a previously developed technology for obtaining hydrogen storage materials based on the Ti-Al-Nb system. The results of SPS of mechanically activated powder mixtures of the Ti-Al-Nb system at a temperature of...
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2022-08-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/16/5560 |
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| author | Mazhyn Skakov Yernat Kozhakhmetov Nurya Mukhamedova Arman Miniyazov Igor Sokolov Azamat Urkunbay Gainiya Zhanbolatova Timur Tulenbergenov |
| author_facet | Mazhyn Skakov Yernat Kozhakhmetov Nurya Mukhamedova Arman Miniyazov Igor Sokolov Azamat Urkunbay Gainiya Zhanbolatova Timur Tulenbergenov |
| author_sort | Mazhyn Skakov |
| collection | DOAJ |
| description | In this research, samples of an alloy with a bimodal structure were studied on the basis of a previously developed technology for obtaining hydrogen storage materials based on the Ti-Al-Nb system. The results of SPS of mechanically activated powder mixtures of the Ti-Al-Nb system at a temperature of 1300 °C make it possible to obtain an alloy with a predominantly bimodal structure. However, an insignificant presence of TiAl<sub>3</sub>, AlNb<sub>2</sub> phases, and unreacted niobium is still observed in the structure. The mechanical properties of alloys of the Ti-Al-Nb system after sintering show abnormally low values of strength and ductility (less than 150 MPa). Two-stage heat treatment of alloys of the Ti-Al-Nb system leads to the decomposition of large precipitates of TiAl<sub>3</sub> with the formation of O-phase nuclei, as well as to the complete dissolution of unreacted niobium and AlNb<sub>2</sub> phases. Heat treatment of alloys of the Ti-Al-Nb system contributes to an increase in its strength by approximately 10 times (1310 MPa, MA-180), and ductility by 2 times (1322 MPa, MA-20). The surface fracture of samples obtained after testing is characterized by intergranular (intercrystalline) brittle fracture with “river” or “step” features. |
| first_indexed | 2024-03-09T09:54:52Z |
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| id | doaj.art-f1b71d50fe154e649474d26802fcff24 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T09:54:52Z |
| publishDate | 2022-08-01 |
| publisher | MDPI AG |
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| series | Materials |
| spelling | doaj.art-f1b71d50fe154e649474d26802fcff242023-12-01T23:56:12ZengMDPI AGMaterials1996-19442022-08-011516556010.3390/ma15165560Effect of a High-Temperature Treatment on Structural-Phase State and Mechanical Properties of IMC of the Ti-25Al-25Nb at.% SystemMazhyn Skakov0Yernat Kozhakhmetov1Nurya Mukhamedova2Arman Miniyazov3Igor Sokolov4Azamat Urkunbay5Gainiya Zhanbolatova6Timur Tulenbergenov7National Nuclear Center of the Republic of Kazakhstan, Kurchatov KZ-071100, KazakhstanInstitute of Atomic Energy Branch of the National Nuclear Center of the Republic of Kazakhstan, Kurchatov KZ-071100, KazakhstanInstitute of Atomic Energy Branch of the National Nuclear Center of the Republic of Kazakhstan, Kurchatov KZ-071100, KazakhstanInstitute of Atomic Energy Branch of the National Nuclear Center of the Republic of Kazakhstan, Kurchatov KZ-071100, KazakhstanInstitute of Atomic Energy Branch of the National Nuclear Center of the Republic of Kazakhstan, Kurchatov KZ-071100, KazakhstanInstitute of Atomic Energy Branch of the National Nuclear Center of the Republic of Kazakhstan, Kurchatov KZ-071100, KazakhstanInstitute of Atomic Energy Branch of the National Nuclear Center of the Republic of Kazakhstan, Kurchatov KZ-071100, KazakhstanInstitute of Atomic Energy Branch of the National Nuclear Center of the Republic of Kazakhstan, Kurchatov KZ-071100, KazakhstanIn this research, samples of an alloy with a bimodal structure were studied on the basis of a previously developed technology for obtaining hydrogen storage materials based on the Ti-Al-Nb system. The results of SPS of mechanically activated powder mixtures of the Ti-Al-Nb system at a temperature of 1300 °C make it possible to obtain an alloy with a predominantly bimodal structure. However, an insignificant presence of TiAl<sub>3</sub>, AlNb<sub>2</sub> phases, and unreacted niobium is still observed in the structure. The mechanical properties of alloys of the Ti-Al-Nb system after sintering show abnormally low values of strength and ductility (less than 150 MPa). Two-stage heat treatment of alloys of the Ti-Al-Nb system leads to the decomposition of large precipitates of TiAl<sub>3</sub> with the formation of O-phase nuclei, as well as to the complete dissolution of unreacted niobium and AlNb<sub>2</sub> phases. Heat treatment of alloys of the Ti-Al-Nb system contributes to an increase in its strength by approximately 10 times (1310 MPa, MA-180), and ductility by 2 times (1322 MPa, MA-20). The surface fracture of samples obtained after testing is characterized by intergranular (intercrystalline) brittle fracture with “river” or “step” features.https://www.mdpi.com/1996-1944/15/16/5560titanium aluminidesTi-Al-Nbmicrostructuremechanical propertieshigh-temperature treatmentspark-plasma sintering |
| spellingShingle | Mazhyn Skakov Yernat Kozhakhmetov Nurya Mukhamedova Arman Miniyazov Igor Sokolov Azamat Urkunbay Gainiya Zhanbolatova Timur Tulenbergenov Effect of a High-Temperature Treatment on Structural-Phase State and Mechanical Properties of IMC of the Ti-25Al-25Nb at.% System Materials titanium aluminides Ti-Al-Nb microstructure mechanical properties high-temperature treatment spark-plasma sintering |
| title | Effect of a High-Temperature Treatment on Structural-Phase State and Mechanical Properties of IMC of the Ti-25Al-25Nb at.% System |
| title_full | Effect of a High-Temperature Treatment on Structural-Phase State and Mechanical Properties of IMC of the Ti-25Al-25Nb at.% System |
| title_fullStr | Effect of a High-Temperature Treatment on Structural-Phase State and Mechanical Properties of IMC of the Ti-25Al-25Nb at.% System |
| title_full_unstemmed | Effect of a High-Temperature Treatment on Structural-Phase State and Mechanical Properties of IMC of the Ti-25Al-25Nb at.% System |
| title_short | Effect of a High-Temperature Treatment on Structural-Phase State and Mechanical Properties of IMC of the Ti-25Al-25Nb at.% System |
| title_sort | effect of a high temperature treatment on structural phase state and mechanical properties of imc of the ti 25al 25nb at system |
| topic | titanium aluminides Ti-Al-Nb microstructure mechanical properties high-temperature treatment spark-plasma sintering |
| url | https://www.mdpi.com/1996-1944/15/16/5560 |
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