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Heat Treatment Effects on Mechanical Behavior of Cu-15Ni-8Sn Produced via Powder Metallurgy

Caris, Joshua

Abstract Details

2007, Doctor of Philosophy, Case Western Reserve University, Materials Science and Engineering.
Certain spring applications require a material with a combination of high strength, stiffness, and electrical conductivity. An alloy, Cu-15wt%Ni-8wt%Sn, formed via a powder metallurgy process, is one of several copper-based alloys which can be heat treated/processed to form a metallic nano-structured alloy with good combinations of yield strength and electrical conductivity. For certain heat treatment conditions, this alloy decomposes spinodally from a face centered cubic disordered phase to form tin-rich and tin-lean composition fluctuations that are 10-100nm thick. Additional time at temperature produces ordering of the tin-rich regions. Uniaxial tensile tests have been used to identify the aging conditions with the highest yield strength. The uniaxial tensile and fully-reversed, flexural fatigue properties of the various heat-treated conditions were compared with observed fracture surfaces to characterize the failure mechanisms of the various time and temperature evolved microstructures. The mechanical properties have been correlated with structural information obtained from a variety of different techniques. Optical metallography, transmission electron microscopy, resistivity measurements, differential scanning calorimetry traces and X-ray diffraction spectra were used to map the evolution of specific micro-and nano-structural features with various heat treatments. Scanning electron microscopy(SEM) and laser confocal microscopy were used to detail the effects of heat treatment/microstructural changes on the operative flow and fracture mechanisms. Distinct changes to the flow and fracture behavior were observed and are correlated with the changes in microstructure provided by the different heat treatments.
John Lewandowski (Advisor)
301 p.

Recommended Citations

Citations

  • Caris, J. (2007). Heat Treatment Effects on Mechanical Behavior of Cu-15Ni-8Sn Produced via Powder Metallurgy [Doctoral dissertation, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1184360740

    APA Style (7th edition)

  • Caris, Joshua. Heat Treatment Effects on Mechanical Behavior of Cu-15Ni-8Sn Produced via Powder Metallurgy. 2007. Case Western Reserve University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1184360740.

    MLA Style (8th edition)

  • Caris, Joshua. "Heat Treatment Effects on Mechanical Behavior of Cu-15Ni-8Sn Produced via Powder Metallurgy." Doctoral dissertation, Case Western Reserve University, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=case1184360740

    Chicago Manual of Style (17th edition)