Accession Number : AD0695911

Title :   EFFECT OF ALLOYING ON THE MECHANICAL PROPERTIES OF CAST TANTALUM,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Tylkin,M. A. ; Tsyganov,I. A.

Report Date : 23 APR 1969

Pagination or Media Count : 18

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)

Descriptors :   (*TANTALUM ALLOYS, MECHANICAL PROPERTIES), HARDNESS, DUCTILITY, REDUCTION OF AREA, ARC MELTING, ELECTRON BEAM MELTING, MICROSTRUCTURE, MELTING POINT

Subject Categories : Properties of Metals and Alloys
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE