在喷气发动机中，工作温度不低于９５０℃的大多数定向凝固高温合金涡轮叶片和导向叶片通常含有铪，以提高力学性能和使用性能。加入铪增加了合金的成本，从而限制了其应用。北京航空材料研究院在７０年代后期开发了一种无铪的定向凝固高温合金ＤＺ４。该合金力学性能高，可铸性好，成本低，适于生产应用。本文将讨论ＤＺ４合金的成分和显微组织特征，并介绍该合金的力学性能和工程应用 In jet engines, most of the directional solidification superalloy turbine blades and vanes that operate at temperatures not lower than 950 ° C typically contain hafnium to improve mechanical and service properties. The addition of hafnium increases the cost of the alloy, limiting its use. Beijing Institute of Aeronautical Materials developed a hafnium-free directional solidification superalloy DZ4 in the late 1970s. The alloy has high mechanical properties, good castability, low cost and suitable for production and application. This article will discuss the composition and microstructure of DZ4 alloy, and describes the mechanical properties of the alloy and engineering applications