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

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

Bibliographic Details
Main Author: Caris, Joshua
Language:English
Published: Case Western Reserve University School of Graduate Studies / OhioLINK 2007
Subjects:
Cu alloy
Cu-Ni-Sn
Spring Alloy
Fatigue
Tension
Hardness
Microstructure
DSC
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=case1184360740
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-case11843607402021-08-03T05:32:18Z Heat Treatment Effects on Mechanical Behavior of Cu-15Ni-8Sn Produced via Powder Metallurgy Caris, Joshua Cu alloy Cu-Ni-Sn Spring Alloy Fatigue Tension Hardness Microstructure DSC 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. 2007-07-18 English text Case Western Reserve University School of Graduate Studies / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=case1184360740 http://rave.ohiolink.edu/etdc/view?acc_num=case1184360740 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
topic Cu alloy
Cu-Ni-Sn
Spring Alloy
Fatigue
Tension
Hardness
Microstructure
DSC
spellingShingle Cu alloy
Cu-Ni-Sn
Spring Alloy
Fatigue
Tension
Hardness
Microstructure
DSC
Caris, Joshua
Heat Treatment Effects on Mechanical Behavior of Cu-15Ni-8Sn Produced via Powder Metallurgy
author Caris, Joshua
author_facet Caris, Joshua
author_sort Caris, Joshua
title Heat Treatment Effects on Mechanical Behavior of Cu-15Ni-8Sn Produced via Powder Metallurgy
title_short Heat Treatment Effects on Mechanical Behavior of Cu-15Ni-8Sn Produced via Powder Metallurgy
title_full Heat Treatment Effects on Mechanical Behavior of Cu-15Ni-8Sn Produced via Powder Metallurgy
title_fullStr Heat Treatment Effects on Mechanical Behavior of Cu-15Ni-8Sn Produced via Powder Metallurgy
title_full_unstemmed Heat Treatment Effects on Mechanical Behavior of Cu-15Ni-8Sn Produced via Powder Metallurgy
title_sort heat treatment effects on mechanical behavior of cu-15ni-8sn produced via powder metallurgy
publisher Case Western Reserve University School of Graduate Studies / OhioLINK
publishDate 2007
url http://rave.ohiolink.edu/etdc/view?acc_num=case1184360740
work_keys_str_mv AT carisjoshua heattreatmenteffectsonmechanicalbehaviorofcu15ni8snproducedviapowdermetallurgy
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