二元アルミニウム合金とマグネシウム合金の実測密度と多元系への拡張

摘要

Equation representing dependence of density on composition was deduced for dilute binary solid solutions. The constants in an expression of D/kgm~(-3)=D_0 +triangle open D (6Vmass percent) were obtained from Vegard's law. For an easy calculation from contents of commercial alloys expressed commonly in mass percent, previously measured values of density were put in order, as functions of mass percent. This expression was expanded to multicomponent systems and it has been clarified that the values of triangle open D determined by measurement on binary alloys arc also-valid for Al 7, Mg and Al Mg Si Cu systems. Using the present triangle open D values, the density of rather widespread multicomponent alloys can be easily estimated, excepting Al -Si binary system which density is increased by solute Si and decreased by precipitation of elemental Si from Al(Si) solid solution. Effect of dislocations introduced by severe cold rolling is rather small. Only about 0.2 percent or 5kgm~(-3) decrease of density was observed in a 87 percent cold rolled 6N01 alloy.