2D　forging　processes　are　adopted　to　tailor　the　microstructures　and　mechanical　properties　of　near　?　titanium　alloys　with　different　boron　contents　and　the　evolutions　of　the　microstructures　and　mechanical　properties　of　the　acquired　alloys　are　carefully　characterised.　Maximum　texture　intensities　decrease　with　increasing　boron　contents,　thereby　illustrating　the　improvements　in　the　homogeneity　of　the　microstructures.　The　distribution　of　TiB　whiskers　in　the　3D　space　exhibits　a　near-columnar　arrangement　around　boundaries　of　squashed　and　elongated　prior　13　grains　along　the　stretching　direction.　Increases　in　the　contents　of　equiaxed　?　grains　with　increasing　TiB　contents　are　ascribed　to　enhancements　in　recrystallisation　due　to　the　promotion　effects　of　the　TiB　phase　and　increases　in　13　transus　temperatures.　Boron　exhibits　excellent　refinement　effects　on　the　alloy　matrices,　and　the　refinement　degree　increases　with　increasing　boron　contents.　The　proportions　of　low-angle　grain　boundaries　decrease　whilst　the　corresponding　proportions　of　high-angle　grain　boundaries　increase　with　increasing　boron　contents.　The　ultimate　and　yield　strengths　of　the　alloys　increase　at　room　temperature　(RT)　and　650　?C.　Elongations　exhibit　a　decreasing　trend　at　RT　but　are　maintained　at　650　?C.　At　RT,　cleavage　fractures　of　the　TiB　whiskers　determine　the　evolution　law　of　elongation.　The　fracture　characteristics　of　alloy　matrices　exhibit　a　transformation　from　a　mixture　of　tearing　lamellae　and　dimples　to　dimples　only.　At　650　?C,　the　alloy　matrices　are　characterised　by　ductile　fractures　with　numerous　dimples.　Er　containing　particles　facilitate　the　fracture　of　alloy　through　cooperative　effects　with　TiB　whiskers.