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61S and its families have begun to be used for constructing aircrafts, vessels and buildings in recent days. These alloys belong to Al-Mg2Si alloys which include A-51S, 53S, 61S and 63S etc. in U. S. A. This report covers the explanation on the compositions, mechanical property of these alloys and the result of chemical experiments made with such alloys. With the heat-treated alloys, 6 experiments were made to investigate the effect of the compositions on the mechanical property and corrosion resistance of the alloys. Then the tensile test and corrosion test were made with those alloys. As the result, the conclusions of 7 item mentioned in the last part of this report could be given.

EFFECTS OF COMPONENTS ON THE PROPERTY OF 61S ALLOY