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Dispersion Strengthening of Lead by Coprecipitation.
Tilman-MM; Crosby-RL; Desy-DH
NTIS: PB 205 497 :9 pages
The Bureau of Mines conducted research into the dispersion strengthening of lead by the coprecipitation method. Commercially available reagents in water solutions were reacted to form homogeneous precipitates of lead and aluminum compounds. The resulting precipitates were roasted to oxides and reduced in hydrogen to form mixtures of lead powder and alumina. The powders were isostatically pressed into billets which were extruded into rods. The rods were rolled into strip to provide material for testing. Alloys containing 0.5, 1, 2, and 3 nominal volume-percent al2o3 were tested in short-time tensile tests and in tensile creep tests. An alloy of pb-3 volume-percent al2o3 exhibited an average tensile strength of 8,570 psi after rolling to 75-percent reduction at 125 deg c but had no measurable elongation. Alloys of lower al2o3 content provided a better compromise between tensile strength and ductility. For example, an alloy of pb-0.5 Volume-percent al2o3 content had an average tensile strength of 6,590 psi with 9-percent elongation after rolling to 75-percent reduction at 125 deg c. Creep rates of dispersion-strengthened pb-al2o3 alloys were below 1 percent in 10,000 hours at stresses of 2,000 to 4,000 psi.
IH; Report of Investigation;
NTIS Accession No.
NTIS: PB 205 497
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division