B-containing　high　temperature　titanium　alloys　were　in　situ　fabricated　successfully　by　casting　route.　The　influences　of　heat　treatment　processes　on　the　evolution　of　microstructures,　textures,　strengths,　elongations　and　fracture　characteristics　at　room　temperature　(RT)　and　high　temperature　(650　degrees　C)　were　analyzed.　Microstructure　investigation　revealed　that　TiB　whiskers　stimulated　the　dynamic　recrystallization　behavior.　The　volume　fractions　of　primary　alpha　phase　(V-P　alpha)　decreased　with　the　increasing　solution　temperature,　while　the　volume　fractions　of　transformed　beta　phase　(V-T　beta)　and　widths　of　secondary　alpha　lamellas　in　transformed　beta　phase　(W-S　alpha)　increased.　The　inverse　pole　figures　(IPFs)　observations　illustrated　nea-requiaxed　alpha　grains　transformed　to　ideal　equiaxed　morphology　after　960　degrees　C　solution.　By　the　analyzation　of　pole　figues　(PFs),　after　alpha+beta　heat　treatments,　the　overall　texture　intensity　increased　with　the　increasing　solution　temperature,　and　after　beta　heat　treatments,　textures　with　comparatively　high　intensities　were　concentrated　around　various　directions.　The　equiaxed　alpha　grains　and　lamellar　alpha　phase　had　similar　main　texture　components.　But　the　maximum　texture　intensity　of　lamellar　alpha　phase　was　obviously　higher　than　that　of　equiaxed　alpha　grains.　Moreover,　the　textures　of　equiaxed　alpha　gains　and　lamellar　alpha　phase　exhibited　higher　similarity　after　980　degrees　C　solution　comparing　with　after　960　degrees　C　solution.　Alloy　after　980　degrees　C　solution　exhibited　an　excellent　combination　of　RT　and　650　degrees　C　mechanical　properties　which　was　ascribed　to　the　microstructure　tailoring　and　the　load-sharing　effect　of　TiB　whiskers.　Fracture　of　alloys　was　due　to　the　debonding　of　TiB　whiskers,　and　the　growth　and　coalescence　of　micro-voids　in　matrix　and　around　the　cracks　of　fractured　TiB　whiskers.　(C)　2019　Elsevier　B.V.　All　rights　reserved.