A study of heat treatment on microstructures and tensile properties of a new high strength titanium alloy

doi:10.12442/j.issn.1002-185X.20181124

Home > Archive>Volume 49, Issue 3, 2020 >825-832. DOI:10.12442/j.issn.1002-185X.20181124

A study of heat treatment on microstructures and tensile properties of a new high strength titanium alloy
DOI:
                        10.12442/j.issn.1002-185X.20181124
                    
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                        shengjinwenshengjinwen
central south university
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Affiliation:central south university
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Abstract:

In this paper, the microstructure and mechanical properties of a high strength titanium alloy (Ti–6Al–6Mo–4V) were firstly investigated. The relationship between microstructures and properties of the alloys were investigated after solution treatment at α/β and β regions and then aging at five different temperatures ranging from 460℃ to 620℃ for 6h. The results illustrate the alloys after α/β region solution treatment and aging show a more attractive combination of strength and elongation than β solution treatment and aging. After solution treatment at 850℃ (α/β region) and aging at 460℃, the alloy obtains the highest strength (1572MPa) with elongation (2.63%). When aging at 620℃, the alloy obtains the highest elongation (11.46%) but lower strength (1201MPa). After solution treatment at 825℃ plus aging at 540℃, this alloy reaches a great combination of strength (1328MPa) and elongation (7.58%).Meanwhile, due to the large β grains after β region solution treatment and fine secondary α forms during aging, it does not obtain an attractive strength after β region solution treatment plus aging.

Key words:Ti–6Al–6Mo–4V; microstructures; mechanical properties; fracture surface

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[shengjinwen. A study of heat treatment on microstructures and tensile properties of a new high strength titanium alloy[J]. Rare Metal Materials and Engineering,2020,49(3):825~832.]
DOI：10.12442/j. issn.1002-185X.20181124

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Received:November 08,2018
Revised:December 27,2018
Adopted:December 29,2018
Online: April 08,2020
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