Arc deposition creates multilayer Ni?Al alloys. Ni/NiAl has higher yield strength (750?MPa) and ultimate compressive strength (1810?MPa) at 650?°C and 0.6?MPa, with faster strain hardening. Ni?Ni/NiAl?NiAl has higher maximum hardness (573?HV) but less uniform hardness distribution. Both show mixed ductile and brittle fracture under dynamic impact, with Ni/NiAl having better overall performance.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 ??Ni/???Ni3Al biphasic spherical structure, along with a small quantity of massive ???Ni3Al. 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.

» Author: Cui Xin Chen, Chen Gu, Xin Hang Li, Hai Tao Xue, Wei Bing Guo, Bin Feng, Cai Wang Pei

» Publication Date: 08/09/2025

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