Steel clad NiAl rods were prepared by high-temperature gas extrusion (HTGE) of steel cartridges stuffed with reactive Ni–Al powder compacts upon variation in warmup temperature T_w (600–780 °C) and gas (Ar) pressure P (200–480 MPa). A largest amount of NiAl and Ni₃Al intermetallics in rod core was obtained at T_w = 780°С and P = 200 MPa. For T_w < 660°С (m.p. of Al), the rod core was found to contain significant amounts of unreacted Al and Ni. A transition zone of Al–Fe intermetallics (10 μm thick) was found only in the rod obtained at T_w = 780°С and P = 200 MPa. The core material of such rods exhibited a largest mean value of hardness (1050 HV). It is suggested that the yield of target intermetallics can be improved by using charge compacts prepared from mechanically activated Ni–Al blends. Combined use of (a) in-situ synthesis of target product in a core and (b) extrusion of the entire fixture seem promising for fabrication of composite materials with unique properties.

在预热温度T _w (600–780 °C) 和气体 (Ar) 压力P (200– 480 兆帕）。在T _w  = 780°С 和P  = 200 MPa 时，在棒芯中获得了最大量的 NiAl 和 Ni ₃ Al 金属间化合物。对于T _w  < 660°С（Al 的 mp），发现棒芯含有大量未反应的 Al 和 Ni。仅在T _w  = 780°С 和P获得的棒中发现了 Al-Fe 金属间化合物的过渡区（10 μm 厚） = 200 兆帕。这种棒的芯材表现出最大的硬度平均值 (1050 HV)。建议使用由机械活化的 Ni-Al 混合物制备的电荷压块可以提高目标金属间化合物的产率。结合使用（a）在核心中原位合成目标产品和（b）整个夹具的挤出似乎有希望制造具有独特性能的复合材料。