5Roebuck B. Ultrafine grained hardmetals grain size and distribution [R].London:NPL Measurement Note03,2001 : 1-12.
6Gille G, Szesny B,Dreyer K,et al.Submicro and Ultrafine Grained Hardmetals for Microdrills and Metal Cutting Inserts [J]. International Journal of Refractory Metals&Hard Materials,2002,20(1):3-22.
7Quigley D G F, Luyckx S, James M N. New results on the relationship between hardness and fracture toughness of WC-Co hardmetal[J]. Materials Science and Engineering 1996,209:228-230.
8Angastiniotis N C, Kear B H. Bulk synthesis of novel nanocrystalline and amorphous tungsten-base materials [J]. Mater. Sci. Forum, 1995, 179-181:357.
9Gille G, Szesny B, Dreyer K, et al. Submicro and Ultrafine Grained Hanimetals for Microdrills and Metal Cutting Inserts[A]. Proceedings of 15th International Plansee Seminar[C]. Reutte,Austria: Plansee Holding AG, 2001,782.
10Gurland J. The fracture strength of sintered tungsten carbide-cobalt alloys in relation to composition and particle spacing [J]. Trans. TMS, 1963, 227:1146.
