Journal of Japan Institute of Light Metals

The relationship between the surface condition of heat-treated aluminum and its adhesive strength to epoxy adhesives was investigated. The adhesive strength was determined by 180-degree peel test. The chemical state of the aluminum surface was evaluated using Fourier transform infrared spectroscopy (FT-IR) and Time of flight secondary ion mass spectrometry (TOF-SIMS). The results showed that adhesive strength was decreased with increasing heat-treatment temperature above 120°C and the amount of hydroxy group on the aluminum surface was decreased with increasing heating temperature. There was a significant linear relationship between the adhesive strength and the amount of hydroxy group. From these results hydrogen bonding is concluded to be the dominant factor of the adhesion.

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The texture and hardness of high purity aluminum single crystals that have been deformed by recurrent biaxial compression were investigated. Three types of specimens, WW, BW, and RR, were prepared using a modified Bridgeman method. The two compression axes were［100］and［0-10］in WW,［ 101］and［0-10］in BW, and［596］ and［15 -11 4］in RR. The specimens were deformed along one compression axis under plane strain conditions at a strain of 0.25, and then they were deformed along the other axis at the same strain conditions. Biaxial compressions up to eight times were repeatedly performed, for which the cumulative strain was 2. The textures of all the specimens after eight biaxial compressions showed that the average crystal orientations were within approximately 15° relative to the initial orientations. Textures were formed because of the forward/inverse slips of identical active slip systems during biaxial compression. The hardness tests of the three specimens indicated an obvious dependency on initial orientation. The WW specimen exhibited the lowest hardness value, which was ascribed to the occurrence of cross slips that continued for the eight biaxial compressions.

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