Methods of Improving Creep Resistance of Alloys.
U S Pat 3 730 781 1973 May; :
Zinc alloys containing cu and ti have substantially improved creep resistance after cold rolling >90 pct and subsequently annealing at 300 deg-400 deg f for 2-8 h, compared with that after just hot rolling. The improvement is caused by the arrangement of tizn15 particles in the structure. Annealing also decreased the difference in creep rate that is usually found in sheet transversely and longitudinally to the rolling direction. It likewise decreased the thermal expansion and its anisotropy. A representative zn alloy containing cu 0.75 and ti 0.12 pct had after 92 pct reduction by cold-rolling 83 and 98 pct/day longitudinal and transverse creep rate, respectively. After annealing 2h at 400 deg f, the respective creep rates were 0.0048 and 0.0017 pct/day. Most of the annealed alloys had a longitudinal to transverse creep rate of approximately 3.
U.S. Pat. 3,730,781; May 1, 1973; Chem. Abstr. 79:45,039S