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Grain size, orientation, and morphology effects on AA6061-T652 mechanical properties
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DOI：10.1007/s10853-026-13209-6.png)
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Abstract
En 中文
Predicting the mechanical behavior of engineering alloys with grain sizes on the order of the component has proven a consistent challenge to modeling efforts, especially when these metals are deformed beyond their yield stress. In particular, grain morphology effects are generally ignored. This study is a first step toward addressing this gap by examining the effects of grain morphology on the yield stress and work hardening of oligocrystalline AA6061-T652. Tension testing and electron backscatter diffraction were used to study the impacts on elastic and plastic mechanical properties of grain morphology, orientation, and size. Columnar versus Bamboo grain morphologies were found to significantly impact the mechanical properties of this material. Columnar grain morphologies exhibited greater yield stresses but less work hardening than Bamboo grain morphologies. Island grains significantly increased the work hardening but had little effect on yield stress. Grain morphology was found to significantly influence the elastic and plastic behavior of this material through the parallel versus series loading inherent to the Columnar and Bamboo grain morphologies. Grain orientation appeared to have a secondary influence with some trends within the Columnar morphology and specimen groups. In all cases, grain sizes were on the order of the specimen size, and specimen-to-specimen variations in grain size had no clear effect on mechanical properties. This study demonstrated that grain morphology effects cannot be ignored when examining the mechanical properties of large-grained materials.
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3.9
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3.2W
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