Microstructure and properties of a shape memory alloy Ti–Ni–Al–V fabricated by double-wire arc additive manufacturing
Xiaoxin Zhao,
Xinya Chen,
Tao Ma,
Peng Zhang,
Jianguo Li,
Xin Zhang
Affiliations
Xiaoxin Zhao
Research Center of Energy Engineering Advanced Joining Technology, Beijing Institute of Petrochemical Technology, Beijing 102627, China; State Key Laboratory of Smart Manufacturing for Special Vehicles and Transmission System, Baotou 014030, China; Corresponding author. Research Center of Energy Engineering Advanced Joining Technology, Beijing Institute of Petrochemical Technology, Beijing 102627, China.
Xinya Chen
School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300382, China
Tao Ma
Inner Mongolia First Machinery Group Co., Ltd, Baotou 014030, China; State Key Laboratory of Smart Manufacturing for Special Vehicles and Transmission System, Baotou 014030, China
Peng Zhang
Inner Mongolia First Machinery Group Co., Ltd, Baotou 014030, China; State Key Laboratory of Smart Manufacturing for Special Vehicles and Transmission System, Baotou 014030, China
Jianguo Li
Inner Mongolia First Machinery Group Co., Ltd, Baotou 014030, China; State Key Laboratory of Smart Manufacturing for Special Vehicles and Transmission System, Baotou 014030, China
Xin Zhang
School of Automobile Engineering, Changshu Institute of Technology, Suzhou 215506, China
In this study, a novel heterogeneous double-wire arc additive manufacturing method was used for the in-situ synthesis of a novel Ti–Ni–Al–V alloy wall. The results indicated that the synthesis wall was composed of the NiTi2, B2, and Ni4Ti3 phases from the bottom to the top. With an increase in deposition layers, the Ti2Ni content decreased. The hardness at the bottom was ∼685.4 HV0.2, while that of the middle and stable regions was 553 HV0.2. The maximum compressive strength was 2100 MPa. The fracture morphology was brittle. After cyclic compression, the recoverable and unrecoverable strains were 4.79 % and 1.21 %, respectively, indicating excellent recovery characteristics. Highlights: • A novel Ti–Ni–Al–V alloy fabricated in situ for the first time • Reaction between pure Ni and Ti–6Al–4V wires occurs in weld pool • As-Built wall is composed of NiTi2, B2, and Ni4Ti3 phases • Microhardness of Ti–Ni–Al–V alloy stabilized at 553 HV0.2.
