Effect of Particle Size Distribution on Strength of Precipitation-Hardened Alloys
Aging of precipitation hardened alloys results in particle coarsening, which in turn affects the strength. In this study, the effect of particle size distribution on the strength of precipitation-hardened alloys was considered. To better represent real alloys, the particle radii were distributed using the Wagner and Lifshitz and Slyozov (WLS) particle size distribution theory. The dislocation motion was simulated for a range of mean radii and the critical resolved shear stress (CRSS) was calculated in each case. Results were also obtained by simulating the dislocation motion through the same system but with the glide plane populated by equal strength particles, which represent mean radii for each of the aging times. The CRSS value with the WLS particle distribution tends to decrease for lower radii than it does for the mean radius approach. The general trend of the simulation results compares well with the analytical values obtained using the equation for particle shearing and the Orowan equation.
A. J. Kulkarni et al., "Effect of Particle Size Distribution on Strength of Precipitation-Hardened Alloys," Journal of Materials Research, vol. 19, no. 9, pp. 2765-2773, Materials Research Society, Sep 2004.
The definitive version is available at http://dx.doi.org/10.1557/JMR.2004.0364
Mechanical and Aerospace Engineering
Materials Science and Engineering
National Science Foundation (U.S.)
University of Missouri Research Board
Keywords and Phrases
Computer simulation; Particle size analysis; Probability density function; Shear stress; Critical resolved shear stress; Precipitation hardened alloys; Age hardening
International Standard Serial Number (ISSN)
Article - Journal
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