708 Basic Study for Large Area's Friction Stir Processing on Cold Sprayed Aluminum Coating (original) (raw)
2016, Hokuriku Shin'etsu Shibu Sokai, koenkai koen ronbunshu
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Ultrasonic Detection of Crack Opening at Cold Flake Interface of Aluminum Alloy Die-Cast
2007
Ultrasonic measurement was carried out with specimens made by aluminum alloy die-cast plates (ADC12) having a cold flake to observe echoes reflected from the surface, bottom and cold flake. The echo reflected from the cold flake had the same phase as that of the surface echo, and it was found that the ultrasonic wave was reflected from the oxide layer of the cold flake. This means that the cold flake and the matrix are not separated but stick together or join together. Next, ultrasonic measurement was carried out with specimens containing cold flake transversely to the tensile direction during tensile testing with a water bag to examine the change in the echo reflected from the cold flake. In the case of the specimen containing coarse cold fake, the phase of the echo reflected from the cold flake was reversed in the tensile testing, and it was found that debonding occurred between the cold flake and matrix to open the crack at the cold flake. And in some cases, the echo reflected fr...
The anodizing of ADC 12 aluminum die-casting alloy, ADC 12 without Cu, Fe, or Mn (M-ADC 12), cast ADC 12 (C-ADC 12), and rapidly solidified ADC 12 (RS-ADC 12) has been investigated in 10 and 30wt% H2SO4 solutions at 293K with a constant current density of 100A/m2. Anodic oxide film formation was examined by measuring the time variations in anode potential, the amount of dissolved Al3+, Cu2+ and Fe2+ ions, and the volume of O2 evolved on the anode, as well as by electron microscopic observation of the oxide film. The steady value of the anode potential in 10wt%-solution was 35-57V, increasing in the order C-ADC 12<RS-ADC 12=M-ADC 12<ADC 12. The metal dissolution current was 22-25A/m2, independent of the kind of specimen, while the gas evolution current was 15-30A/m2, increasing in the order M-ADC 12 <RS-ADC 12 =C-ADC 12
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