Microstructures and properties of powder metallurgy TiAl alloys
The microstructures and properties of powder metallurgy (PM) TiAl alloys fabricated by hot-extrusion of gas-atomized powder at different temperatures (1150, 1250 and 1400 °C) have been investigated. Microstructure of the alloy fabricated at 1150 °C consists of fine grains of γ and α 2 phases in asso...
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| container_title | Materials science & engineering. A, Structural materials : properties, microstructure and processing |
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| creator | Hsiung, L.M Nieh, T.G |
| description | The microstructures and properties of powder metallurgy (PM) TiAl alloys fabricated by hot-extrusion of gas-atomized powder at different temperatures (1150, 1250 and 1400
°C) have been investigated. Microstructure of the alloy fabricated at 1150
°C consists of fine grains of
γ and
α
2 phases in association with coarse grains of B2 (ordered bcc) phase. Metastable
ω particles of ordered hexagonal phase were observed within some B2 grains. This alloy (containing metastable B2 phase) displayed a low-temperature superplastic behavior, i.e. a tensile elongation of 310% was obtained when the alloy was tested at 800
°C under a strain rate of 2×10
−5 s
−1. Microstructure of the alloy fabricated at 1250
°C consists of coarse grains of
α
2 phase and fine grains of
γ and
α
2 phases. This alloy (containing no B2 phase) on the other hand displayed no low-temperature superplasticity, as recorded from the alloy fabricated at 1150
°C. A refined fully lamellar (FL) microstructure was successfully developed within the alloys fabricated at 1400
°C. The widths of
γ lamellae are in a range between 100 and 350
nm and the widths of
α
2 lamellae are in a range between 10 and 50
nm. Solute effects on the creep resistance of refined FL-TiAl alloy were critically investigated. |
| doi_str_mv | 10.1016/S0921-5093(02)00639-1 |
| format | Article |
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°C) have been investigated. Microstructure of the alloy fabricated at 1150
°C consists of fine grains of
γ and
α
2 phases in association with coarse grains of B2 (ordered bcc) phase. Metastable
ω particles of ordered hexagonal phase were observed within some B2 grains. This alloy (containing metastable B2 phase) displayed a low-temperature superplastic behavior, i.e. a tensile elongation of 310% was obtained when the alloy was tested at 800
°C under a strain rate of 2×10
−5 s
−1. Microstructure of the alloy fabricated at 1250
°C consists of coarse grains of
α
2 phase and fine grains of
γ and
α
2 phases. This alloy (containing no B2 phase) on the other hand displayed no low-temperature superplasticity, as recorded from the alloy fabricated at 1150
°C. A refined fully lamellar (FL) microstructure was successfully developed within the alloys fabricated at 1400
°C. The widths of
γ lamellae are in a range between 100 and 350
nm and the widths of
α
2 lamellae are in a range between 10 and 50
nm. Solute effects on the creep resistance of refined FL-TiAl alloy were critically investigated.</description><identifier>ISSN: 0921-5093</identifier><identifier>EISSN: 1873-4936</identifier><identifier>DOI: 10.1016/S0921-5093(02)00639-1</identifier><language>eng</language><publisher>Amsterdam: Elsevier B.V</publisher><subject>Alloy ; Applied sciences ; Elasticity. Plasticity ; Exact sciences and technology ; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology ; Metal powders ; Metals. Metallurgy ; Microstructure ; Powder ; Powder metallurgy. Composite materials ; Production techniques</subject><ispartof>Materials science & engineering. A, Structural materials : properties, microstructure and processing, 2004-01, Vol.364 (1), p.1-10</ispartof><rights>2002 Elsevier B.V.</rights><rights>2004 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c434t-4cceaefcc23136fbb8fa11eda0730194334f47f26576943bf024a4439b331ed53</citedby><cites>FETCH-LOGICAL-c434t-4cceaefcc23136fbb8fa11eda0730194334f47f26576943bf024a4439b331ed53</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/S0921-5093(02)00639-1$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3541,27915,27916,45986</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=15404984$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Hsiung, L.M</creatorcontrib><creatorcontrib>Nieh, T.G</creatorcontrib><title>Microstructures and properties of powder metallurgy TiAl alloys</title><title>Materials science & engineering. A, Structural materials : properties, microstructure and processing</title><description>The microstructures and properties of powder metallurgy (PM) TiAl alloys fabricated by hot-extrusion of gas-atomized powder at different temperatures (1150, 1250 and 1400
°C) have been investigated. Microstructure of the alloy fabricated at 1150
°C consists of fine grains of
γ and
α
2 phases in association with coarse grains of B2 (ordered bcc) phase. Metastable
ω particles of ordered hexagonal phase were observed within some B2 grains. This alloy (containing metastable B2 phase) displayed a low-temperature superplastic behavior, i.e. a tensile elongation of 310% was obtained when the alloy was tested at 800
°C under a strain rate of 2×10
−5 s
−1. Microstructure of the alloy fabricated at 1250
°C consists of coarse grains of
α
2 phase and fine grains of
γ and
α
2 phases. This alloy (containing no B2 phase) on the other hand displayed no low-temperature superplasticity, as recorded from the alloy fabricated at 1150
°C. A refined fully lamellar (FL) microstructure was successfully developed within the alloys fabricated at 1400
°C. The widths of
γ lamellae are in a range between 100 and 350
nm and the widths of
α
2 lamellae are in a range between 10 and 50
nm. Solute effects on the creep resistance of refined FL-TiAl alloy were critically investigated.</description><subject>Alloy</subject><subject>Applied sciences</subject><subject>Elasticity. Plasticity</subject><subject>Exact sciences and technology</subject><subject>Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology</subject><subject>Metal powders</subject><subject>Metals. Metallurgy</subject><subject>Microstructure</subject><subject>Powder</subject><subject>Powder metallurgy. Composite materials</subject><subject>Production techniques</subject><issn>0921-5093</issn><issn>1873-4936</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2004</creationdate><recordtype>article</recordtype><recordid>eNqFkEtLw0AUhQdRsFZ_gpCNoovonUdeq1KKL6i4sK6HyeSOjKRJnEmU_nsnbdGlq8uB79x7zyHknMINBZrevkLBaJxAwa-AXQOkvIjpAZnQPOOxKHh6SCa_yDE58f4DAKiAZEJmz1a71vdu0P3g0EeqqaLOtR263gbZmqhrvyt00Rp7VdeDe99EKzuvoyDajT8lR0bVHs_2c0re7u9Wi8d4-fLwtJgvYy246GOhNSo0WjNOeWrKMjeKUqwUZBxoITgXRmSGpUmWBlUaYEIJwYuS84AlfEoud3vDb58D-l6urddY16rBdvCS5YzzhNEAJjtwjOUdGtk5u1ZuIynIsS65rUuOXUhgcluXHH0X-wPKa1Ubpxpt_Z85ESCKXARutuMwpP2y6KTXFhuNlXWoe1m19p9LPwG6frs</recordid><startdate>20040115</startdate><enddate>20040115</enddate><creator>Hsiung, L.M</creator><creator>Nieh, T.G</creator><general>Elsevier B.V</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope></search><sort><creationdate>20040115</creationdate><title>Microstructures and properties of powder metallurgy TiAl alloys</title><author>Hsiung, L.M ; Nieh, T.G</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c434t-4cceaefcc23136fbb8fa11eda0730194334f47f26576943bf024a4439b331ed53</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2004</creationdate><topic>Alloy</topic><topic>Applied sciences</topic><topic>Elasticity. Plasticity</topic><topic>Exact sciences and technology</topic><topic>Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology</topic><topic>Metal powders</topic><topic>Metals. Metallurgy</topic><topic>Microstructure</topic><topic>Powder</topic><topic>Powder metallurgy. Composite materials</topic><topic>Production techniques</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Hsiung, L.M</creatorcontrib><creatorcontrib>Nieh, T.G</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>Materials science & engineering. A, Structural materials : properties, microstructure and processing</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Hsiung, L.M</au><au>Nieh, T.G</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Microstructures and properties of powder metallurgy TiAl alloys</atitle><jtitle>Materials science & engineering. A, Structural materials : properties, microstructure and processing</jtitle><date>2004-01-15</date><risdate>2004</risdate><volume>364</volume><issue>1</issue><spage>1</spage><epage>10</epage><pages>1-10</pages><issn>0921-5093</issn><eissn>1873-4936</eissn><abstract>The microstructures and properties of powder metallurgy (PM) TiAl alloys fabricated by hot-extrusion of gas-atomized powder at different temperatures (1150, 1250 and 1400
°C) have been investigated. Microstructure of the alloy fabricated at 1150
°C consists of fine grains of
γ and
α
2 phases in association with coarse grains of B2 (ordered bcc) phase. Metastable
ω particles of ordered hexagonal phase were observed within some B2 grains. This alloy (containing metastable B2 phase) displayed a low-temperature superplastic behavior, i.e. a tensile elongation of 310% was obtained when the alloy was tested at 800
°C under a strain rate of 2×10
−5 s
−1. Microstructure of the alloy fabricated at 1250
°C consists of coarse grains of
α
2 phase and fine grains of
γ and
α
2 phases. This alloy (containing no B2 phase) on the other hand displayed no low-temperature superplasticity, as recorded from the alloy fabricated at 1150
°C. A refined fully lamellar (FL) microstructure was successfully developed within the alloys fabricated at 1400
°C. The widths of
γ lamellae are in a range between 100 and 350
nm and the widths of
α
2 lamellae are in a range between 10 and 50
nm. Solute effects on the creep resistance of refined FL-TiAl alloy were critically investigated.</abstract><cop>Amsterdam</cop><pub>Elsevier B.V</pub><doi>10.1016/S0921-5093(02)00639-1</doi><tpages>10</tpages></addata></record> |
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| ispartof | Materials science & engineering. A, Structural materials : properties, microstructure and processing, 2004-01, Vol.364 (1), p.1-10 |
| issn | 0921-5093 1873-4936 |
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| source | ScienceDirect Journals (5 years ago - present) |
| subjects | Alloy Applied sciences Elasticity. Plasticity Exact sciences and technology Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology Metal powders Metals. Metallurgy Microstructure Powder Powder metallurgy. Composite materials Production techniques |
| title | Microstructures and properties of powder metallurgy TiAl alloys |
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