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Abstract:
The softening and hardening effect of irradiation was investigated by means of static tensile tests using simpliest test samples (metal crystals, zinc and aluminum). Softening occurs, if irradiation is superimposed on the static strain during deformation. It may become so marked that the samples may be deformed practically without stresses. Crystals thus deformed, however, prove to be hardened to a great extent. Hardening can also be observed with samples, which to a certain extent only were deformed with superimposed ultrasonics. This implies that softening occurs during superimposed irradiation, whereas a hardening takes place as soon as irradiation is ceased (superposition of two processes possible, one of them being prevailing). This hardening effect occurring after straining is proven by tests in which increasing straining with ultrasonics took place prior to the static tensile test. The extent of prestrain of samples turns out to be of utmost importance for the effect of irradiation. Whereas with low degrees of plastic deformation irradiation hardens, this effect passes into a softening with high degrees of plastic pre-deformation. Experiments with zinc crystals proved that thermal recovery occurs much faster with samples hardened by irradiation than with cold-worked ones. (Author)
| Description: |
Final rept., 1 Feb 63-31 Jan 64. |
| Pages: |
25 |
| Report Date: |
31 JAN 1964 |
| Contract Number: |
N625583436 |
| Report Number: |
0383006 |
Report Unavailable |
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