This　interdisciplinary　work　concerns　misorientations　across　various　interfaces　in　spark　plasma-sintered　(SPSed)　WC-Co　cemented　carbides,　as　well　as　how　these　misorientations　affect　the　intergranular　fracture.　The　whole　boundaries　in　cemented　carbides　were　divided　according　to　the　phases　on　the　two　sides　of　the　boundary　plane,　and　carbide/carbide　grain　boundaries　were　further　divided　according　to　the　misorientation　across　the　boundary　plane.　Stereological　statistics　and　five-parameter　analysis　were　comprehensively　performed　on　the　concerned　boundary　types.　For　Sigma　2　carbide/carbide　boundaries,　multiple　boundary　structures　are　observed.　How　Sigma　2　twist　inhibits　intergranular　fracture　and　how　such　boundary　structure　is　formed　are　analyzed.　For　random　carbide/carbide　boundaries,　the　habit　planes　that　they　are　terminated　by　are　calibrated,　and　their　responses　to　intergranular　fracture　are　examined　according　to　their　energy　anisotropy.　For　WC/alpha-cobalt　and　WC/beta-cobalt　phase　boundaries,　misorientations　across　these　boundary　planes　and　the　corresponding　crack　propagation　routines　are　illustrated.　On　these　bases,　approaches　to　improve　the　fracture　strength　of　SPSed　cemented　carbides　are　suggested.　This　interdisciplinary　work　concerns　misorientations　across　various　interfaces　in　spark　plasma-sintered　(SPSed)　WC-Co　cemented　carbides,　as　well　as　how　these　misorientations　affect　the　intergranular　fracture.　Taken　Sigma　2　carbide/carbide　boundaries　as　an　example,　how　Sigma　2　twist　inhibits　intergranular　fracture　and　how　such　boundary　structure　is　formed　are　analyzed.　Efforts　to　improve　the　fracture　strength　of　SPSed　cemented　carbides　are　also　suggested.　image