引言 钨钼铌钽及其合金是非常吸引人的高温材料。作为高温材料,除应具有很好的高温强度外,还应有良好的低温延性。早些时候,着重用固溶强化方法提高合金的高温强度。近年来则着重研究用沉淀强化和形变热处理的方法,提高合金的高温强度,改善合金的低温塑性。在钨和铝合金中,碳化铪 Introduction Tungsten, molybdenum, niobium, tantalum and their alloys are very attractive high temperature materials. As a high temperature material, in addition to having a good high temperature strength, but also should have good low temperature ductility. Earlier, focusing on the use of solid solution strengthening method to improve the high temperature strength of the alloy. In recent years, the emphasis has been placed on methods of precipitation strengthening and heat treatment to improve the high temperature strength of the alloy and to improve the low temperature plasticity of the alloy. In tungsten and aluminum alloys, hafnium carbide