Microstructures,　mechanical　properties　and　fractural　characteristics　of　boron-containing　titanium　alloys　are　carefully　investigated.　Strengthening　mechanism,　recrystallization　mechanism　and　fractural　mechanism　are　revealed.　Above　90%　equiaxed　α　grains　are　acquired　in　TA6.5-0.2B,　and　almost　all　grains　transform　to　equiaxed　morphology　in　TA6.5-0.4B.　TiB　whiskers　exhibit　nearly　oriented　arrangement,　and　its　contents　increase　with　increasing　boron　additions.　TiB　whiskers　impede　moved　dislocations　and　stimulate　dynamic　recovery　and　recrystallization　of　α　grains.　More　whiskers　provide　more　sufficient　motivation　for　recrystallization.　Room-temperature　strengths　increase　with　increasing　boron　contents,　while　elongations　decrease.　650 °C　strengths　also　increase,　continuously,　while　elongations　increase　firstly　and　then　decrease.　Strengths　gradually　decrease　with　increased　tensile　temperatures,　and　elongations　increase,　continuously.　When　temperatures　are　higher　than　600 °C,　decreasing　rates　of　strengths　are　higher　than　that　at　temperatures　lower　than　600 °C.　Elongations　show　contrary　evolution　laws　comparing　with　strengths.　Decreased　strengths　and　increased　elongations　are　mainly　ascribed　to　the　softening　of　matrix　and　grain　boundary　sliding,　and　more　significant　with　increased　tensile　temperatures.　At　room　temperature,　grain　refinement　strengthening,　load　transferring　strengthening,　dislocation　strengthening　and　thermal　mismatch　strengthening　increase　with　increased　boron　contents.　At　650 °C,　most　important　mechanism　for　enhancement　of　strengths　is　load　transferring　strengthening.　©　ASM　International　2024.