Abstract
Effects of single addition of Sn and combined addition of Sn and other element (Cu, Mg, Zn, Ti, Si, Bi, Cr, Mn, Ni) to aluminum on the diffusion bondability of molybdenum and aluminum alloys in the atmosphere were investigated. Diffusion bonding was carried out at 873 K for 3.6 ks under the pressure of 2 MPa. After the bonding, Al12Mo, Al4Mo and Al8Mo3 whose total thicknesses range from about 25 μm to 45 μm according to different alloying elements in aluminum, are formed in the diffusion layer. There is not correspondence between the shear fracture strength and the total thickness. The combined addition of Sn and Mg to aluminum produces the couple showing good bondability with the strength of about 40 MPa, while the single addition of Sn shows the strength of only 25 MPa. All bonding couples except Mo/Al–0.5Sn and Mo/Al–0.5Sn–1Bi, which fractures at near the interface of aluminum alloy and Al12Mo, tear at the interface of Al8Mo3 and molybdenum.
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