Dynamic Compression Performance of Multilayer Nickel Aluminum Alloy Produced by Arc Deposition

To enhance the high‐temperature strength and ductility of nickel‐based alloys and to address the research gap in the dynamic mechanical properties of nickel–aluminum intermetallic compounds, the microstructure, hardness, and dynamic mechanical properties of multilayer gradient Ni‐Al alloys fabricated by arc deposition are investigated. The surface layer is primarily composed of acicular and lath M‐NiAl. With decreasing deposition height, the structure transitions to a γ‐Ni/γ′‐Ni 3 Al biphasic spherical structure, along with a small quantity of massive γ′‐Ni 3 Al. The Ni‐Ni/NiAl‐NiAl sediment exhibits a maximum hardness of 573 HV, whereas the Ni/NiAl sediment has a hardness of 388 HV. However, the Ni/NiAl sediment exhibits superior hardness and uniformity. At 650 °C and 0.6 MPa, it achieves a stress of 1770 MPa, coupled with a faste strain hardening rate. At 650 °C, under identical impact pressure and layer count conditions, the Ni/NiAl sediment exhibits superior yield strength (750 MPa) and ultimate compressive strength (1810 MPa) compared to the Ni‐Ni/NiAl‐NiAl sediment. The fracture surfaces of both sediments exhibit smooth surfaces and dimples, indicating a combination of ductile and brittle fracture modes. Finally, NiAl and Ni alternating multilayer composites fabricated by arc deposition technology demonstrate superior plasticity and high‐temperature strength.