ISSN:
1662-8985
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Nanostructured and ultra-fine grained metals have higher strength but extremely limitedductility compared to coarse grained metals. However, their ductility can be greatly improved byintroducing a specific range of grain sizes in the microstructures. In the paper, multiscale unit cellapproach (UCA) is developed and applied to predict the averaged stress-strain relations of the multiscalemicrostructure metals. The unit cell models are three-phase structured at different scalelengths of 100 nm, 1 μm and 10 μm with different volume fractions and periodic boundaryconditions. The contributions of multi-scale microstructures to the macroscopic structural propertiesof metals are also studied using a analytic approach—two-step mean-field method (TSMF), wherethree microstructural parameters are introduced and thus mechanical properties such as strength andductility are presented as a function of these parameters. For verification of these proposednumerical and theoretical algorithms, the structural properties of the pure nickel with three-grainmicrostructures are studied and the results from FEA and the proposed theory have good agreement
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.83.pdf
