The　deformation　behavior　in　polycrystalline　Laser　melting　deposited　(LMD)　TA15　alloy　was　investigated　at　a　temperature　of　500　degrees　C　using　advanced　in-situ　Secondary　electron　microscopy　(SEM)　tensile　setup　coupled　with　Electron　backscatter　diffraction　(EBSD).　The　grains　morphology,　crystal　orientation,　preferred　pole　texture,　activated　slip　traces,　grain　boundaries　evolution,　and　strain-induced　misorientation　were　systematically　analyzed　during　tensile　straining.　It　was　determined　that　the　diverse　alpha-grains　(crystal　orientation　and　morphology)　revealed　inhomogeneous　deformation　under　tensile　loading.　The　overall　strain　was　allocated　by　grain　rotation　and　substructure　formation.　The　preferred　oriented　(0001)　pole　texture　maximum　was　increased　during　initial　strain　level.　In　contrast,　at　higher　strain,　the　texture　intensity　was　decreased　due　to　the　formation　and　relocation　of　the　newly　formed　substructures.　The　fraction　of　low　angle　grain　boundaries　(LAGBs　2-10　degrees)　was　increased　continually　with　increasing　strain.　Strain-induced　dislocations　within　larger　grains　formed　new　LAGBs,　and　the　increasing　fraction　of　LAGBs　was　validated　by　Kernel　average　misorientation　(KAM)　map.　The　prismatic　slip　mode　was　identified　as　the　primary　active　slip　system　at　the　initial　deformation　stage.　The　fraction　of　basal　and　pyramidal　　slips　increased　as　the　strain　increased,　describing　the　opposite　trend　to　prismatic　slip.　The　grains　rotation　and　strain　accumulation　at　the　grain　boundaries　accommodated　the　plastic　deformation,　ultimately　causing　boundary　sliding.