アルミニウム溶接金属におけるミクロ偏析

概要

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Bead-on-plate welding was performed on thin sheets of 99.96%-, 1050- and 1100- aluminum. Then, the microsegreagation was investigated in the weld metal of these materials with the aid of electron probe microanalyser. Morevoer, distribution of dislocations and compounds in the weld meatl were examined by means of electorn microscope. Main conclusions obtained are as follows : 1) Compounds of Al_3Fe and AlFeSi were observed in the weld metal of 1050-aluminum. 2) It was observed that Fe segregated in boundaries of subgrains. This was due to the phenomenon that compounds mentioned in (1) were developed in subboundaries. 3) Content of compounds in boundaries of columnar grains was almost the same as in boundaries of subgrains. 4) Boundaries of subgrains observed in 99.96% -aluminum consisted of dislocations parallel to the growth direction and tangled dislocations. In this case compounds were not observed. 5) There existed compounds in boundaries of subgrains in the weld metal of commercially pure aluminum and dislocations tangled in the compounds. Besides, some boundaries consisted only of dislocations.
1973-08-25