Phase transformations in Ti-Nb-Ta and Ti-Nb-Ta-Zr alloys
Phase transformations in solution treated and quenched Ti-(13-26) Nb-(22-38) Ta (wt.%) and Ti-(13-35.5) Nb-(5-22) Ta-(4-7.2) Zr alloys have been studied. It has been observed that phase transformations in these alloys are sensitive to both composition and cooling rate. In ternary alloys, water and o...
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| Veröffentlicht in: | Journal of materials science 2000-04, Vol.35 (7), p.1805-1811 |
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| creator | TANG, X AHMED, T RACK, H. J |
| description | Phase transformations in solution treated and quenched Ti-(13-26) Nb-(22-38) Ta (wt.%) and Ti-(13-35.5) Nb-(5-22) Ta-(4-7.2) Zr alloys have been studied. It has been observed that phase transformations in these alloys are sensitive to both composition and cooling rate. In ternary alloys, water and oil quenching resulted in the formation of orthorhombic martensite (α′′) in a retained β + ωathermal matrix, whereas slower cooling showed evidence of fine α and ωisothermal formation within the β matrix. Increase of Nb + Ta content decreases the volume percentage of martensite. Moreover, addition of Zr stabilized the β phase, lowered the martensite start temperature and suppressed ω formation. Finally, dynamic moduli of air cooled quaternary alloys showed that the modulus was sensitive to the composition, a minima at Nb/Ta ratio of 12.0 and 5 at% Zr being observed, this minimum in dynamic modulus being consistent with ω phase suppression. |
| doi_str_mv | 10.1023/A:1004792922155 |
| format | Article |
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J</creator><creatorcontrib>TANG, X ; AHMED, T ; RACK, H. J</creatorcontrib><description>Phase transformations in solution treated and quenched Ti-(13-26) Nb-(22-38) Ta (wt.%) and Ti-(13-35.5) Nb-(5-22) Ta-(4-7.2) Zr alloys have been studied. It has been observed that phase transformations in these alloys are sensitive to both composition and cooling rate. In ternary alloys, water and oil quenching resulted in the formation of orthorhombic martensite (α′′) in a retained β + ωathermal matrix, whereas slower cooling showed evidence of fine α and ωisothermal formation within the β matrix. Increase of Nb + Ta content decreases the volume percentage of martensite. Moreover, addition of Zr stabilized the β phase, lowered the martensite start temperature and suppressed ω formation. Finally, dynamic moduli of air cooled quaternary alloys showed that the modulus was sensitive to the composition, a minima at Nb/Ta ratio of 12.0 and 5 at% Zr being observed, this minimum in dynamic modulus being consistent with ω phase suppression.</description><identifier>ISSN: 0022-2461</identifier><identifier>EISSN: 1573-4803</identifier><identifier>DOI: 10.1023/A:1004792922155</identifier><identifier>CODEN: JMTSAS</identifier><language>eng</language><publisher>Heidelberg: Springer</publisher><subject>Applied sciences ; Beta phase ; Composition ; Condensed matter: structure, mechanical and thermal properties ; Cooling rate ; Equations of state, phase equilibria, and phase transitions ; Exact sciences and technology ; Heat treating ; Martensite ; Martensitic transformations ; Materials science ; Metals. Metallurgy ; Niobium ; Oil quenching ; Phase transitions ; Physics ; Quaternary alloys ; Specific phase transitions ; Tantalum ; Tantalum base alloys ; Ternary alloys</subject><ispartof>Journal of materials science, 2000-04, Vol.35 (7), p.1805-1811</ispartof><rights>2000 INIST-CNRS</rights><rights>Journal of Materials Science is a copyright of Springer, (2000). 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J</creatorcontrib><title>Phase transformations in Ti-Nb-Ta and Ti-Nb-Ta-Zr alloys</title><title>Journal of materials science</title><description>Phase transformations in solution treated and quenched Ti-(13-26) Nb-(22-38) Ta (wt.%) and Ti-(13-35.5) Nb-(5-22) Ta-(4-7.2) Zr alloys have been studied. It has been observed that phase transformations in these alloys are sensitive to both composition and cooling rate. In ternary alloys, water and oil quenching resulted in the formation of orthorhombic martensite (α′′) in a retained β + ωathermal matrix, whereas slower cooling showed evidence of fine α and ωisothermal formation within the β matrix. Increase of Nb + Ta content decreases the volume percentage of martensite. Moreover, addition of Zr stabilized the β phase, lowered the martensite start temperature and suppressed ω formation. Finally, dynamic moduli of air cooled quaternary alloys showed that the modulus was sensitive to the composition, a minima at Nb/Ta ratio of 12.0 and 5 at% Zr being observed, this minimum in dynamic modulus being consistent with ω phase suppression.</description><subject>Applied sciences</subject><subject>Beta phase</subject><subject>Composition</subject><subject>Condensed matter: structure, mechanical and thermal properties</subject><subject>Cooling rate</subject><subject>Equations of state, phase equilibria, and phase transitions</subject><subject>Exact sciences and technology</subject><subject>Heat treating</subject><subject>Martensite</subject><subject>Martensitic transformations</subject><subject>Materials science</subject><subject>Metals. Metallurgy</subject><subject>Niobium</subject><subject>Oil quenching</subject><subject>Phase transitions</subject><subject>Physics</subject><subject>Quaternary alloys</subject><subject>Specific phase transitions</subject><subject>Tantalum</subject><subject>Tantalum base alloys</subject><subject>Ternary alloys</subject><issn>0022-2461</issn><issn>1573-4803</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2000</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><recordid>eNqN0E1Lw0AQBuBFFKzVs9eA4m11ZnY32fVWSv2Aoh5y8hIm6QZT0qTupof-ewMWD556Gl54mOEdIa4R7hFIPcweEUBnjhwRGnMiJmgyJbUFdSomAESSdIrn4iLGNQCYjHAi7McXR58MgbtY92HDQ9N3MWm6JG_kWylzTrhb_QX5GRJu234fL8VZzW30V4c5FfnTIp-_yOX78-t8tpSV0m6QSD5Dx6yxVKtKIxvrsXTelrpGcBpAlaydrpWztvLe2FQ5tcK0KkubgZqKu9-129B_73wcik0TK9-23Pl-FwvKUuMo1UdBMs4dA5UjTSO8-QfX_S50Y9mCKAVE0ISjuj0ojhW39fjIqonFNjQbDvsClbbjWfUD4YN6Sg</recordid><startdate>20000401</startdate><enddate>20000401</enddate><creator>TANG, X</creator><creator>AHMED, T</creator><creator>RACK, H. 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J</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c349t-12e719aa41b3dc41a58e1b9e8b4f1094003ba494f3988cee586393d16cbb8703</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2000</creationdate><topic>Applied sciences</topic><topic>Beta phase</topic><topic>Composition</topic><topic>Condensed matter: structure, mechanical and thermal properties</topic><topic>Cooling rate</topic><topic>Equations of state, phase equilibria, and phase transitions</topic><topic>Exact sciences and technology</topic><topic>Heat treating</topic><topic>Martensite</topic><topic>Martensitic transformations</topic><topic>Materials science</topic><topic>Metals. Metallurgy</topic><topic>Niobium</topic><topic>Oil quenching</topic><topic>Phase transitions</topic><topic>Physics</topic><topic>Quaternary alloys</topic><topic>Specific phase transitions</topic><topic>Tantalum</topic><topic>Tantalum base alloys</topic><topic>Ternary alloys</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>TANG, X</creatorcontrib><creatorcontrib>AHMED, T</creatorcontrib><creatorcontrib>RACK, H. 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J</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Phase transformations in Ti-Nb-Ta and Ti-Nb-Ta-Zr alloys</atitle><jtitle>Journal of materials science</jtitle><date>2000-04-01</date><risdate>2000</risdate><volume>35</volume><issue>7</issue><spage>1805</spage><epage>1811</epage><pages>1805-1811</pages><issn>0022-2461</issn><eissn>1573-4803</eissn><coden>JMTSAS</coden><abstract>Phase transformations in solution treated and quenched Ti-(13-26) Nb-(22-38) Ta (wt.%) and Ti-(13-35.5) Nb-(5-22) Ta-(4-7.2) Zr alloys have been studied. It has been observed that phase transformations in these alloys are sensitive to both composition and cooling rate. In ternary alloys, water and oil quenching resulted in the formation of orthorhombic martensite (α′′) in a retained β + ωathermal matrix, whereas slower cooling showed evidence of fine α and ωisothermal formation within the β matrix. Increase of Nb + Ta content decreases the volume percentage of martensite. Moreover, addition of Zr stabilized the β phase, lowered the martensite start temperature and suppressed ω formation. Finally, dynamic moduli of air cooled quaternary alloys showed that the modulus was sensitive to the composition, a minima at Nb/Ta ratio of 12.0 and 5 at% Zr being observed, this minimum in dynamic modulus being consistent with ω phase suppression.</abstract><cop>Heidelberg</cop><pub>Springer</pub><doi>10.1023/A:1004792922155</doi><tpages>7</tpages></addata></record> |
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| subjects | Applied sciences Beta phase Composition Condensed matter: structure, mechanical and thermal properties Cooling rate Equations of state, phase equilibria, and phase transitions Exact sciences and technology Heat treating Martensite Martensitic transformations Materials science Metals. Metallurgy Niobium Oil quenching Phase transitions Physics Quaternary alloys Specific phase transitions Tantalum Tantalum base alloys Ternary alloys |
| title | Phase transformations in Ti-Nb-Ta and Ti-Nb-Ta-Zr alloys |
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