Precipitate strengthening mechanisms in magnesium zinc alloy single crystals |
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| Authors: | J S Chun J G Byrne |
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| Affiliation: | (1) Division of Materials Science and Engineering, University of Utah, USA |
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| Abstract: | The mechanical behaviour of Mg-5.1 wt % Zn alloy single crystals was studied in the 4.2 to 300° K temperature range. Quenched crystals have activation energies and volumes best associated with the cutting of small clusters of Zn atoms by dislocations. Fully hardened crystals contain fine 
1 and occasional
2 precipitates with an average
1 interparticle spacing of 330 to 660 Å. Strengthening in these crystals is mainly ascribed to the cutting of
1 particles by dislocations. In the overaged condition
1,
2 and equilibrium particles are present and lead to a considerable temperature-dependence unusual for an overaged condition. Analysis of this temperature-dependence suggests that below 77° K the relatively easy cutting of
1 particles by dislocations takes place in addition to the cutting of
2 and particles. Above 77° K the difficult cutting of
2 and particles alone controls the deformation,
1 being more easily cut with the aid of thermal fluctuations. |
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