Cemented carbide material

A cemented carbide for neutron shielding consists of WC, Fe and Cr where Cr is present in an amount from 1-150 % by weight with respect to the Fe content, and optionally up to 50 % by weight Mn with respect to the Fe content and optionally up to 5 % by weight in total of Si, Ti, V, Ge, Ta, Pb and/or Y with respect to the Fe content. The material has a microstructure comprising WC grains, cementite grains and an iron-based binder in which Cr, W and C are dissolved. The material can be made by milling together powders of tungsten carbide, iron and a chromium containing material (e.g. chromium carbide or chromium nitride), and optionally one or more of Si, Ti, V, Ge, Ta, Pb, Y and/or Mn in the form of a carbide, carbonitride and/or intermetallic, pressing the milled powder to form a green body and then sintering at a temperature in the range 1200-1500 0C in a vacuum for at least 15 minutes. The material can be used as a neutron shield in a fusion reactor.