Tsutomu Kishimoto’s research while affiliated with NGH Japan Co., Ltd. and other places

The relationship between the cast structure of commercially pure aluminum ingots and the intermetallic compounds were studied by using an E. P. M. A., a scanning electron microscope, an X-ray diffractometer and a Mössbauer effect spectrometer. The intermetallic compounds were extracted out of several regions of A1100 ingots made by semi-continuous casting with the method reported previously. The size of the intermetallic compounds was found within the range of 0.8μ and 50μ. The intermetallic compounds in the inner region of the “Fir tree” structure were mainly Al6Fe, while outside this region the intermetallic compounds were mostly Al3Fe. However, besides these two major compounds, the unknown compound, which presumably corresponded to the Al-Si-Fe phase, was also found. © 1973, The Japan Institute of Light Metals. All rights reserved.