【摘 要】
：
Mo foil (10-20 μm in thickness) and Al foil (20-60 μm in thickness) were vacuum diffusion bonded at 600-640 ℃ under 20 MPa for 54 min-6 h. The joints were ex
【机 构】
：
Shaanxi Key Laboratory of Friction Welding Technologies,China
论文部分内容阅读
Mo foil (10-20 μm in thickness) and Al foil (20-60 μm in thickness) were vacuum diffusion bonded at 600-640 ℃ under 20 MPa for 54 min-6 h. The joints were examined by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) to study the evolution mechanism of the reaction layers. The results show that Al atoms diffuse into Mo grain boundaries and form reaction products as Mo3Als, MoAl4, MoAl5 and MoAl12. The surface oxide film is eroded by the growths of the reaction products that plow into the lamellar texture of Mo grain boundaries. Mo3Al8 layer grows by "taking root" downwards and transforms into MoAl4 and MoAl5 phases upwards by absorbing Al atoms. MoAl12 layer grows up from MoAl5 layer in the same way. When the supplement of Al atoms ceases, MoAl12 transforms reversely into MoAl5 and MoAl3 into MoAl4 via the loss of Al atoms. However, MoAl4 continues to precipitate from Mo3Al8 layer. At last, there are MoAl4 and Mo3Al8 remained on the joint interface.
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