RESEARCH ON PHASE RELATIONSHIPS IN MAGNESIUM ALLOYS. Period covered: June 15, 1954 to June 15, 1955

Technical Report · Tue Nov 01 04:00:00 EST 1955

OSTI ID:4157346

Yamamoto, A; Levinson, D W; Rostoker, W

The constitutions of the Mg-rich areas of the systems Mg-Th, Mg-Th-Zn, and Mg-Th-Zr were studied. A partial diagram from 0 to 70 wt.% Th of the binary Mg-Th system was constructed. The features of the diagram include a eutectic reaction at 582 deg C and at about 45% Th with the participating phases of the Mg solid solution (4.5% Th) and compound Mg/sub 5/Th (65% Th). The compound was formed on cooling by a peritectic reaction involving a liquid phase of about 53% Th and an unidentified Th-rich phase. The solid solubility of Th in Mg decreased with decreasing temperature from 4.5% Th at the eutectic temperature to less than 1% Th at 300 deg C. The crysthllography of the Mg/sub 5/Th phase, determined by lineal analysis, was included. The isothermal sections at 400 and 300 deg C were constructed for the terrary system Mg-Th-Zn. The uncertainty concerning some of the invariant reactions in the Mg-Zn birary apply to these sections. At the lower temperature, there are lution. A terrary intermediate phase, B, or a Th- Zn binary phase entered into equilibrium with Mg. Partial results were obtained on the Mg-Th-Zr system and complete vertical section diagrams were not constructed. Although the addition of Zr was found inconsistent, it was evident that the effect of Zr on the Mg-Th alloys seems rather small. The freezing mechanism of the ternary alloys was explored. (See also WADC-TR-56-411.) (C.T.G.)

• Research Organization: Illinois Inst. of Tech., Chicago. Armour Research Foundation
• NSA Number: NSA-14-018180
• OSTI ID: 4157346
• Report Number(s): WADC-TN-55-649; AD-89697
• Country of Publication: United States
• Language: English

Related Subjects

COOLING
CRYSTALS
EUTECTICS
INTERMETALLIC COMPOUNDS
LATTICES
LIQUID METALS
MAGNESIUM
MAGNESIUM ALLOYS
METALS, CERAMICS, AND OTHER MATERIALS
QUANTITY RATIO
REACTION KINETICS
SOLID SOLUTIONS
SOLIDIFICATION
TEMPERATURE
THORIUM
THORIUM ALLOYS
ZINC ALLOYS
ZIRCONIUM
ZIRCONIUM ALLOYS