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采用金相显微镜,扫描电镜,观察了Al/LZ91/Al复合板界面组织和形貌,研究了不同退火参数对复合板界面扩散和拉伸性能的影响,并建立了扩散方程。结果表明,Al/LZ91/Al三层复合板退火后中间层LZ91镁合金发生了回复和再结晶,先前轧制被拉长而变形了的晶粒退火后转变为均匀而细小的等轴晶粒。Al/LZ91/Al三层复合板退火后界面发生了Mg和Al等元素的扩散,界面由基体α-Mg+β-Li相、Mg17Al12相、Al3Mg2相以及α-Al相等组成;退火温度为300℃保温1h后的三层复合板抗拉强度和伸长率最大,分别达到130 MPa和15.8%。
The microstructure and morphology of Al / LZ91 / Al composite sheet were observed by optical microscope and scanning electron microscope. The effects of different annealing parameters on the interface diffusion and tensile properties were studied. The diffusion equation was also established. The results show that the LZ91 alloy recovers and recrystallizes after the Al / LZ91 / Al three-layer composite sheet is annealed. Previously elongated and deformed grains were annealed and transformed into uniform and fine equiaxed grains . Al / LZ91 / Al three-layer composite plate annealing occurred at the interface of Mg and Al and other elements of the diffusion, the interface by the matrix α-Mg + β-Li phase, Mg17Al12 phase, Al3Mg2 phase and α-Al equal composition; annealing temperature of 300 The highest tensile strength and elongation of the three-layer composite board after holding at 1 ℃ for 1h reached 130 MPa and 15.8% respectively.