论文部分内容阅读
KAl(7075)alloy/Mg(AZ31)alloy laminated composite plates were successfully fabricated by the equalchannelangular processing(ECAP)by using route A for 1,2,and 3 passes at 573 K,respectively.After fabrication,the 1-pass ECAPed laminated composite plates were annealed at different temperatures.The microstructure evolution,phase constituent,and bonding strength near the joining interface of Al(7075)alloy/Mg(AZ31)alloy laminated composites plates were evaluated with scanning electron microscopy,X-ray diffraction,and shear tests.The experimentalresults indicated that a 20 μm diffusion layer was observed at the joining interface of Al(7075)alloy/Mg(AZ31)alloy laminated composites plates fabricated by the 1-pass ECAP,which mainly included Al_3Mg_2 and Mg_(17)Al_(12) phases.With the increase of passes,the increase of diffusion layer thickness was not obvious and the form of crack in these processes led to the decrease of bonding strength.For 1-pass ECAPed composites,the thickness of diffusion layer remained unchanged after annealed at 473 K,while the bonding strength reached its maximum value 29.12 MPa.However,after elevating heat treatment temperature to 573 K,the thickness of diffusion layer increased rapidly,and thus the bonding strength decreased.
KAl (7075) alloy / Mg (AZ31) alloy laminated composite plates were successfully fabricated by the equal mechanism of plastic processing (ECAP) by using route A for 1,2 and 3 passes at 573 K, respectively. After fabrication, the 1-pass ECAPed laminated composite plates were annealed at different temperatures. microstructure evolution, phase constituent, and bonding strength near the joining interface of Al (7075) alloy / composites composites plates were evaluated with scanning electron microscopy, X-ray diffraction, and shear tests. The experimental results indicated that a 20 μm diffusion layer was observed at the joining interface of Al (7075) alloy / Mg (AZ31) alloy laminated composites fabricated by the 1-pass ECAP, which mainly included Al 3 Mg 2 and Mg 17 ) Al 12 (12) phases. The increase of passes, the increase of diffusion layer thickness was not obvious and the form of crack in these processes led to the decrease of bonding strength. For 1-pass ECAPed composites, the thickness of diffusion l After the bonding strength reaches its maximum value of 29.12 MPa. After elevating heat treatment temperature to 573 K, the thickness of the diffusion layer increased rapidly, and thus the bonding strength decreased.