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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.55  No.2 (2014)  >  pp.357-362

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Hall–Petch Tensile Yield Stress and Grain Size Relation of Al–5Mg–0.5Mn Alloy in Friction-Stir-Processed and Post-Thermal-Exposed Conditions

Chun-Yi Lin1), Truan-Sheng Lui1), Li-Hui Chen1), Fei-Yi Hung1)
1) Department of Materials Science and Engineering, National Cheng Kung University

Friction stir process (FSP) and post thermal exposure were carried out to a microstructure-thermostable cast Al–5Mg–0.5Mn alloy to examine the grain size dependence of tensile yield stress by using Hall–Petch relation, σy = σ0 + kyd−1/2. The measurement of preferred crystalline orientations and grain boundaries characteristic is used to explain the difference of the Hall–Petch parameters. FSP produces fine grain structure and, for the obtained average grain size from 3.7 to 12.8 µm, near-random crystalline orientations and certain proportion of rigid coincident site lattice boundaries (CSLs) is detected. Two-step post thermal exposure leads to a quick development of rotated ⟨001⟩ type crystalline orientations and the obtained coarse grains with average size from 229 to 508 µm are also commonly surrounded by general high angle boundaries. The calculation of Taylor factor and CSLs proportion reveals that stronger texture and grain boundary hardening effects exist in FSPed specimens than in thermal exposed specimens. These items are the major factors leading to larger σ0 and ky in FSPed specimens than in thermal exposed specimens.

friction stir process, thermal exposure, aluminum–magnesium alloy, Hall–Petch relation

Received: August 28, 2013
Accepted: October 29, 2013 , Published online: January 25, 2014
Copyright © 2014 The Japan Institute of Metals and Materials



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