In order to improve the mechanical properties of MGH956 alloy fusion weZding joint, two kinds of self-made materials were used as filler materials to MGH956 alloy for TIG welding respectively. Microstracture and tensi...In order to improve the mechanical properties of MGH956 alloy fusion weZding joint, two kinds of self-made materials were used as filler materials to MGH956 alloy for TIG welding respectively. Microstracture and tensile fracture of joints were researched by scanning electron microscope（SEM）. Reinforced particles were researched by SEM, X-ray diffraction （ XRD ） and energy dispersive X-ray spectrometry （EDS）. These results were compared with joint which is filled with base materials. The results show that new reinforced phases such as TiC, TiN, Ni3Al and A1Ni are produced in the weld metal zone with two kinds of self-made materials as filler materials. The size of these reinforcements is about 1 μm, and the distribution of particles is very uniform in the matrix. The number of pores is reduced. Agglomerate Al-Y-O composite oxides are correspondingly decreased compared to the joint filled with base material. Thus, welded joint perormanee is enhanced. The average room temperature tensile strength of joints are 581 MPa and 607 MPa respectively. The fracture of joints both in general exhibit brittle fracture.展开更多
文摘In order to improve the mechanical properties of MGH956 alloy fusion weZding joint, two kinds of self-made materials were used as filler materials to MGH956 alloy for TIG welding respectively. Microstracture and tensile fracture of joints were researched by scanning electron microscope（SEM）. Reinforced particles were researched by SEM, X-ray diffraction （ XRD ） and energy dispersive X-ray spectrometry （EDS）. These results were compared with joint which is filled with base materials. The results show that new reinforced phases such as TiC, TiN, Ni3Al and A1Ni are produced in the weld metal zone with two kinds of self-made materials as filler materials. The size of these reinforcements is about 1 μm, and the distribution of particles is very uniform in the matrix. The number of pores is reduced. Agglomerate Al-Y-O composite oxides are correspondingly decreased compared to the joint filled with base material. Thus, welded joint perormanee is enhanced. The average room temperature tensile strength of joints are 581 MPa and 607 MPa respectively. The fracture of joints both in general exhibit brittle fracture.
