SYSTEM NIOBIUM - TUNGSTEN - MOLYBDENUM AIRCONIUM.
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
Pagination or Media Count:
By microscopic methods, the determination of the melting point, microphardness, and X-ray methods the structure of six primary sections of the tetrahedron niobium - tungstenmolybdenum -zirconium, parallel to the edge of the ternary system tungsten - molybdenum - zicronium, and also a number of secondary sections were studied the investigated alloys contained totals of 5 7.5 10 15 20 and 30 wt. of tunngsten, molybdenum and zirconium, the remainder being niobium. Projections were constructed of the surfaces of the solidus curve and also the isotherm of cited primary sections at temperatures of 2000, 1800, 1500, and 1100C. The investigated alloys had a single-phase or two-phase structure single-phase alloys constituted quaternary solid solutions of tungsten, molybdenum, and zirconium in niobium, and in the structure of the two-phase alloys there were also observed cystals of the excess phase W, Mo2Zr. A three-dimensional projection of the quaternary system niobium - tungsten - molybdenum - zirconium was consturcted in the form of a polythermic tetrahedron, making it possible to explain the processes of crystallization of the various alloys and their structure in the solid state. Author
- Physical Chemistry
- Properties of Metals and Alloys