Effect of the structure of the fatigue resistance of dispersion-strengthened copper-based condensates I. Experimental dependences

Three groups of DS (dispersion strengthened) materials were produced by condensation of copper and dispersoid vapors in vacuum on a substrate heated to 700 deg C. The preparation parameters varied were dispersoid chemistry (NbC, Mo and 5%Al-Mo), dispersoid volume (0.7-12%) and annealing temperature....

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Published in:Powder metallurgy and metal ceramics 1998-03, Vol.37 (3-4), p.210-216
Main Authors: Lugovskoi, Y F, Kuz'menko, V A, Grechanyuk, N I, Osokin, V A, Molodkina, T A
Format: Article
Language:English
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Summary:Three groups of DS (dispersion strengthened) materials were produced by condensation of copper and dispersoid vapors in vacuum on a substrate heated to 700 deg C. The preparation parameters varied were dispersoid chemistry (NbC, Mo and 5%Al-Mo), dispersoid volume (0.7-12%) and annealing temperature. Microstructure was characterized using TEM micrographs. Tensile strength and fatigue strengths were evaluated (as discussed and described in detail in this article). Microstructural features categorized included dispersoid diameter and mean distance between dispersoid particles. Dispersoid diameters decreased as dispersoid volume fraction was increased and tensile strength increased (a consequence of enhanced dislocation clusters produced by the dispersoid particles). Almost all samples displayed higher fatigue strength (except overannealed groups). Best fatigue strength was provided by Cu-3.7% NbC which displayed fatigue strengths above 300 Mpa (over 10 exp 7 cycles). Theoretical and technological implications are discussed in detail in this article.
ISSN:1068-1302
1573-9066
DOI:10.1007/BF02675985