Al-Ca-Zn3元系状態図の研究

Micrography, inverse rate thermal analysis, X-ray diffraction and EPMA analysis were made. Al-Ca-Zn system is composed of two quasibinary system of Al-CaZnAl and Al-CaZn13 and devided into three regions by these quasibinary systems. Two invariant reactions, peritectic and eutectic, occur in Al-CaZnAl quasibinary system at 856° and 625°C respectively. The eutectic point lies at approximately Al-4.5%Ca-7.3%Zn. Al-CaZn13 quasibinary system has an eutectic point, L=Al+CaZn13, at 546°C at approximately Al-2.4%Ca-57.9%Zn. A binary compound CaAl4 in Al-Ca system gradually changes into a ternary compound CaZnAl3. The axial ratio of its tetragonal structure increases with quantity of Zn. A ternary eutectic reaction proceeds both in Zn concentrated and dilute sides of the Al-CaZn13 quasibinary system at 543° and 380°C respectively.