Ni₃ Al / NiAl / Ni 复合板组织性能及其薄壁构件反应成形一体化工艺研究

Aiming at the forming difficulty of Ni-Al intermetallic compound materials, the microstructure and properties and integrated process of reaction forming for Ni₃Al/ NiAl/ Ni composite sheets were studied. Taking Ni/ Al foil as the test material, the Ni₃Al/ NiAl/ Ni composite sheets obtained by hot pressing composite method at 1200 ℃ and hot pressing time of 0. 5、 1、 2 and 4 h was characterized by microstructure and uniaxial tensile tests at room temperature and high temperature (1000 ℃). According to the test results, the composite sheets have better comprehensive mechanical properties after hot pressing reaction at 1200 ℃ for 1 h. The tensile strength and elongation at room temperature are 527. 6 MPa and 4. 4%, respectively; and the tensile strength and elongation at 1000 ℃ are 165. 7 MPa and 21. 2%, respectively. Further research on the integrated process of reaction forming was carried out with these parameters, and the thin-walled conical cylinder shell with good surface quality and dimensional accuracy was prepared. The microstructure and mechanical properties of thin-walled conical cylinder shell were characterized by sampling, it is found that the microstructure and mechanical properties of thin-walled conical cylinder shell are similar to those of the composite sheets prepared under the same process conditions.