Influences of sub-micrometer Ta and Co dopants on
microstructure and properties of tungsten heavy alloys①
microstructure and properties of tungsten heavy alloys①
(1. China Academy of Engineering Physics, P.O. Box 919-71, Mianyang 621907, China;
2. Nuclear Power Institute of China, P.O. Box 436-4, Chengdu 610041, China)
2. Nuclear Power Institute of China, P.O. Box 436-4, Chengdu 610041, China)
Abstract: Tungsten heavy alloys are aggregates of particles of tungsten bonded with Ni/Fe or Ni/Cu via liquid-phasesintering. The sub-micrometer Ta Co powder was added to this aggregate to strengthen the bonding phase. It is found that the main fracture pattern of the alloys is cleavage of tungsten grains and ductile rupture of bond phase, leading to improved tensile strength and elongation. Dopant Ta can act as grain size inhibitor in tungsten heavy alloys.
Key words: tungsten heavy alloys; sub-micrometer; Co powder; Ta powder; cleavage fracture