Effect of precipitation from tweed matrix on the mechanical properties in a metastable beta alloy of Ti-15-3

Microstructural evolution and age hardening behavior of a new metastable beta Ti–2Al–9.2Mo–2Fe alloy

“…They are usually enhanced by precipitations of ω and α using aging treatment [4]. A number of work on microstructure evolution and age hardening on beta titanium alloys have been performed to evaluate the microstructure/property relationship, such as Ti-10V-2Fe-3Al [5][6][7], Ti-3Al-8V-6Cr-4Mo-4Zr (Beta-C) [8], Ti-11.5Mo-6Zr-4.5Sn (Beta III) [9][10][11], Ti-15V-3Cr-3Sn-3Al [12][13][14][15][16], Ti-6.8Mo-4.5Fe-1.5Al (Timetal LCB) [17][18][19][20], and more recently, Ti-5Al-5Mo-5V-3Cr (Ti-5553) [21][22][23][24][25][26]. Previous work suggests that the strength level of beta titanium alloy is generally controlled by the distribution, size and volume fraction of ω and/or α precipitates, depending on aging temperatures and time; while the ductility is determined by not only the grain size of prior β phase, but also the morphology and distribution of primary α phase [27,28].…”