Sintering atmosphere effects on the ductility of W-Ni-Fe heavy metals

Journal Article · Sun Apr 01 00:00:00 EST 1984 · Metall. Trans., A; (United States)

DOI:https://doi.org/10.1007/BF02644206· OSTI ID:6217397

German, R M; Churn, K S

Residual porosity has a strong negative effect on the ductility of tungsten-nickel-iron heavy metals. This investigation examined the sintering atmosphere role in stabilizing detrimental residual pore structures. Experiments are reported on alloys containing 93, 95, or 97 wt pct W with Ni:Fe ratios of 7:3. The negative effect of prolonged sintering is attributed to pore coarsening involving trapped gas. Calculated pore growth rates for hydrogen filled pores suggest that pore coarsening involves both ripening and coalescence driven by tungsten grain growth. A change in sintering atmosphere from hydrogen to argon midway through the sintering cycle can aid pore degassing and increase ductility and strength.

• Research Organization: Rensselaer Polytechnic Institute, Troy, NY
• OSTI ID: 6217397
• Journal Information: Metall. Trans., A; (United States), Vol. 15A:4
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
IRON ALLOYS
DUCTILITY
SINTERING
NICKEL ALLOYS
TUNGSTEN ALLOYS
DEGASSING
GRAIN GROWTH
MICROSTRUCTURE
POROSITY
ALLOYS
CRYSTAL STRUCTURE
FABRICATION
MECHANICAL PROPERTIES
TENSILE PROPERTIES
360101* - Metals & Alloys- Preparation & Fabrication
360103 - Metals & Alloys- Mechanical Properties