Al single crystals were compressed or rolled 10-30% at room temperature and annealed at 250°C and measured their hardness by a micro-Vickers hardness tester.
Hardness does not decrease monotonously with the time of annealing but shows some anomalous hardening effects. Variation of the lattice constant measured by back reflection of Cu K
α shows some irregularities and closely related to those of hardness, the maximum of the deviation from the lattice constant of well annealed Al being coincided to the peak of hardness.
X-ray diffraction patterns show some anomalies, such as (i) double diffraction by (111)and (242), (ii) double diffraction by (113) and (420), (iii) K
α3 line by (333). All these patterns appear near that of (333).
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