EFFECT OF ALLOYING ON THE MECHANICAL PROPERTIES OF CAST TANTALUM,
Abstract
The effect of alloying with Ti, Zr, V, Nb, Cr, Mo, W, Re, Co, or Ni on the mechanical properties of cast tantalum have been investigated. The hardness of unalloyed tantalum drops with increasing purity. Alloying, as a rule, increased hardness and strength, but reduced ductility. Cobalt and nickel produce the sharpest increase in hardness; titanium and niobium had practically no effect. The best combination of properties was achieved by alloying with tungsten, molybdenum, or rhenium, which raises the room temperature strength of the alloy while maintaining sufficient ductility. At 1500 and 1800C, the strength of tantalum-tungsten and tantalum-rhenium alloys is 2-3 times higher than that of unalloyed tantalum. The maximum strength of tantalum-niobium alloy is attained at a niobium content of 30-40 percent; in this case, however, the alloy elongation drops to 18-20 percent and the reduction of area to 38-47 percent. Tantalum-niobium alloy has good formability at room temperature regardless of the amount of components. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 23, 1969
- Accession Number
- AD0695911
Entities
People
- I. A. Tsyganov
- M. A. Tylkin
Organizations
- National Air and Space Intelligence Center