QUANTITATIVE ANALYSIS OF THE Al-Cu-Mg-Mn-Si PHASE DIAGRAM AS APPLIED TO COMMERCIAL ALUMINUM ALLOYS OF SERIES 2XXX

摘要

The Thertno-Calc software is used for analyzing the Al-Cu-Mg-Mn-Si system as applied to alloys of the 2xxx series including computation of isothermal and polythermal sections. It is shown that the solidus temper ature of alloys D16, Dl, AK6 and AK8 differs by 22, 38,40 and 38℃, respectively, within the standardized compositions. The total fraction of excess phases may differ by more than a factor of 5 in alloy AK8 depend ing on the concentrations of the alloying elements. The data of the computation show that the standardized compositions of alloys of series 2xxx have to be corrected.