Effects of the manufacturing process on fracture behaviour of cast TiAl intermetallic alloys
The ? -TiAl based intermetallic alloys are interesting candidate materials for high-temperature applications with the efforts being directed toward the replacement of Ni-based superalloys. TiAl-based alloys are characterised by a density (3.5-4 g/cm3) which is less than half of that of Ni-based supe...
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Gruppo Italiano Frattura
2013-12-01
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| Series: | Fracture and Structural Integrity |
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| Online Access: | https://www.fracturae.com/index.php/fis/article/view/1203 |
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| author | A. Brotzu F. Felli D. Pilone |
| author_facet | A. Brotzu F. Felli D. Pilone |
| author_sort | A. Brotzu |
| collection | DOAJ |
| description | The ? -TiAl based intermetallic alloys are interesting candidate materials for high-temperature applications with the efforts being directed toward the replacement of Ni-based superalloys. TiAl-based alloys are characterised by a density (3.5-4 g/cm3) which is less than half of that of Ni-based superalloys, and therefore these alloys have attracted broad attention as potential candidate for high-temperature structural applications. Specific composition/microstructure combinations should be attained with the aim of obtaining good mechanical properties while maintaining satisfactory oxidation resistance, creep resistance and high temperature strength for targeted applications. Different casting methods have been used for producing TiAl based alloys. In our experimental work, specimens were produced by means of centrifugal casting. Tests carried out on several samples characterised by different alloy compositions highlighted that solidification shrinkage and solid metal contraction during cooling produce the development of relevant residual stresses that are sufficient to fracture the castings during cooling or to produce a delayed fracture. In this work, crack initiation and growth have been analysed in order to identify the factors causing the very high residual stresses that often produce explosive crack propagation throughout the casting. |
| format | Article |
| id | doaj-art-c90b32c1df214603a132dbd1b48044f0 |
| institution | Kabale University |
| issn | 1971-8993 |
| language | English |
| publishDate | 2013-12-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-c90b32c1df214603a132dbd1b48044f02025-01-03T01:03:07ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89932013-12-01827Effects of the manufacturing process on fracture behaviour of cast TiAl intermetallic alloysA. Brotzu0F. Felli1D. Pilone2Dipartimento ICMA, Sapienza Università di Roma, Roma (Italy)Dipartimento ICMA, Sapienza Università di Roma, Roma (Italy)Dipartimento ICMA, Sapienza Università di Roma, Roma (Italy)The ? -TiAl based intermetallic alloys are interesting candidate materials for high-temperature applications with the efforts being directed toward the replacement of Ni-based superalloys. TiAl-based alloys are characterised by a density (3.5-4 g/cm3) which is less than half of that of Ni-based superalloys, and therefore these alloys have attracted broad attention as potential candidate for high-temperature structural applications. Specific composition/microstructure combinations should be attained with the aim of obtaining good mechanical properties while maintaining satisfactory oxidation resistance, creep resistance and high temperature strength for targeted applications. Different casting methods have been used for producing TiAl based alloys. In our experimental work, specimens were produced by means of centrifugal casting. Tests carried out on several samples characterised by different alloy compositions highlighted that solidification shrinkage and solid metal contraction during cooling produce the development of relevant residual stresses that are sufficient to fracture the castings during cooling or to produce a delayed fracture. In this work, crack initiation and growth have been analysed in order to identify the factors causing the very high residual stresses that often produce explosive crack propagation throughout the casting.https://www.fracturae.com/index.php/fis/article/view/1203Titanium aluminides |
| spellingShingle | A. Brotzu F. Felli D. Pilone Effects of the manufacturing process on fracture behaviour of cast TiAl intermetallic alloys Fracture and Structural Integrity Titanium aluminides |
| title | Effects of the manufacturing process on fracture behaviour of cast TiAl intermetallic alloys |
| title_full | Effects of the manufacturing process on fracture behaviour of cast TiAl intermetallic alloys |
| title_fullStr | Effects of the manufacturing process on fracture behaviour of cast TiAl intermetallic alloys |
| title_full_unstemmed | Effects of the manufacturing process on fracture behaviour of cast TiAl intermetallic alloys |
| title_short | Effects of the manufacturing process on fracture behaviour of cast TiAl intermetallic alloys |
| title_sort | effects of the manufacturing process on fracture behaviour of cast tial intermetallic alloys |
| topic | Titanium aluminides |
| url | https://www.fracturae.com/index.php/fis/article/view/1203 |
| work_keys_str_mv | AT abrotzu effectsofthemanufacturingprocessonfracturebehaviourofcasttialintermetallicalloys AT ffelli effectsofthemanufacturingprocessonfracturebehaviourofcasttialintermetallicalloys AT dpilone effectsofthemanufacturingprocessonfracturebehaviourofcasttialintermetallicalloys |