The　effect　of　the　densification　mechanism　on　the　Sigma　2　grain　boundary　plane　distribution　was　investigated　in　WC-Co　composites.　Specimens　were　prepared　separately　by　sintering　in　hot　isostatic　press　(sinterHIP)　and　spark　plasma　sintering　(SPS).　It　was　found　that　the　Sigma　2　twist　boundary　is　the　most　common　boundary　in　both　cases,　but　that　the　SPS　material　had　more　than　three　times　the　relative　area　of　these　boundaries　compared　to　the　sinter-HIP　material.　Measurements　of　the　WC/WC　and　WC/Co　boundary　lengths　are　compared　to　measured　mechanical　properties　and　found　to　be　consistent　with　established　stereological　results,　suggesting　a　path　to　link　interface　area　measurements　to　the　mechanical　properties　of　WC-Co　samples.　(C)　2012　Elsevier　B.V.　All　rights　reserved.