Phase Tra nsfor.ations in t he Lean 6-Ti Alloys:
2. 1. 1 The r:f +'eets of Bot Working a nd So l ution Treatllent on 0"1' and the
8 Gr ain Structur e. One of tke chief differences between t he "lean" e l ass of
8- Ti a lloys and the " rich" alloys is t hat the l a t ter have lower 8-transus
temperatures and therefore eannot be extensi vely worked in the a-a phase
field wi t hout using extrelllCly high loads. As wi ll be diseussed in It later
section, concerns related to the forma tion of eont inuous grain boundary (I
layer tend to preclude SOlution treatlllCnt of the richer alloys below the
transus temperature. l.ean a lloys, on the other han d, can and usually aTe
both worked and so l ution treated below the ir transus temperatures i n order to
ma intain the desired distribution , morphOlogy and vol ume fraction of a . This
usu