Abstract
Tensile-stress-strain data over a strain range from 0.2 to 30% were obtained at room temperature for 99.999 and 99.5% aluminium as a function of grain size.
The yield stress-grain size relationship can be expressed by a Petch-Hall relation with approximately the same slope for the two materials. The flow stress-grain size relationship can adequately be expressed by a modified Petch-Hall relation; for 99.999% aluminium material the slope increases with strain through a maximum around 15–20%, whereas for 99.5% aluminium the slope decreases with the strain to zero at strains about 10%.
The flow stress-grain size relationship was analyzed in terms of matrix strengthening and grain boundary strengthening according to the dislocation concept of Ashby. At intermediate strains this approach gives a good description of the effect of strain, grain size and purity on the flow stress.
Original language | English |
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Journal | Acta Metallurgica |
Volume | 25 |
Issue number | 8 |
Pages (from-to) | 863-869 |
ISSN | 0001-6160 |
DOIs | |
Publication status | Published - 1977 |