A　new　cobalt-based　coating,　CoNiTi,　was　developed　for　brake　disc　applications.　The　effect　of　temperature　on　the　tensile　and　thermal　fatigue　cracking　properties　of　CoNiTi　was　evaluated　between　room　temperature　(RT)　and　700　°C,　and　compared　with　those　of　the　commercial　CoCrMoW　and　Stellite　6　coatings.　The　strength　of　all　coatings　decreased　with　increasing　test　temperature,　and　the　elongation　to　fracture　of　Stellite　6　increased　with　increasing　test　temperature.　However,　CoNiTi　and　CoCrMoW　presented　deterioration　in　elongation　to　fracture　at　400–500　°C.　In　addition,　the　crack　propagation　rate　of　CoCrMoW　and　CoNiTi　also　presented　a　trend　of　accelerated　increase　under　RT　∼700　°C　thermal　fatigue　condition.　By　combining　the　finite　element　simulation　of　thermal　fatigue　and　in-situ　tensile　test,　the　grain　boundary　weakness　at　middle　temperature　was　revealed　to　clarify　the　reason　for　the　deterioration　of　plasticity　and　crack　growth　resistance　in　CoCrMoW　and　CoNiTi.　The　microstructure　evolution　of　γ-Co　→　Ε-Co　martensitic　transformation　during　tests　depended　on　the　temperature　and　chemical　composition　associated　with　stacking　fault　energy　(SFE).　Increasing　temperature　and　nickel　content　could　improve　SFE,　stabilize　γ-Co,　and　make　dislocation　glide　in　cross-slip　mode,　on　the　contrary,　γ-Co　tended　to　undergo　martensitic　transformation,　and　the　dislocation　was　in　planar-slip　mode,　when　SFE　was　low.　©　2022　Elsevier　B.V.