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Influence of Rolling Temperature and Copper Content on Creep and Other Properties of Zinc-copper and Zinc-titanium-copper Alloys.
NTIS: PB 190 971 :45 pages
The Bureau of Mines evaluated the properties and anisotrophy in properties of rolled zn-cu and zn-0.12 pct ti-cu alloys with various copper additions to 1.25 pct. The alloys were rolled cold and at various hot-rolling temperatures to reductions as high as 92 pct after breakdown rolling. The properties are extremely sensitive to various combinations of composition, rolling temperature, and rolling reduction. Zn-cu alloys can develop good creep resistance, but they are inferior in that respect to zn-ti-cu alloys. For alloys either with or without the titanium addition, cold-rolling results in recrystallization of the matrix and rejection of copper from solution, causing poor hardness, tensile, and creep properties, but high ductility. Peak tensile strengths develop when the alloys are rolled in the range 320 deg. to 400 deg. F. Best creep resistance for zn-cu alloys requires higher rolling temperatures when copper content is increased. Creep resistance is best for zn- ti-cu alloys with about 0.75 to 1.0 pct cu rolled near 480 deg. F. Some copper is soluble in the tizn15 phase, which forms into "stringers" during rolling. The possible contributions to creep behavior of factors such as distribution of second-phase particles, grain size, and preferred orientation are discussed.
IH; Report of Investigation;
NTIS Accession No.
NTIS: PB 190 971
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division