Irradiation tensile fracture stress

Figure 10.8a shows the effect of irradiation on the tensile fracture stress with the corresponding effect on the Charpy impact toughness in Fig. 10.8b as a shift of the ductile-brittle transition to higher temperatures and... 

The effect of elevated irradiation temperatures is to reduce the yield stress increase, but the tensile strength increase may be greater under the higher temperature conditions. The uniform elongation is usually greater for elevated temperatures of irradiation. In some cases the reduction of area is drastically reduced by elevated temperature irradiations, and fracture has occurred without necking. Thus it is not clear whether elevated irradiation temperatures are always beneficial. 

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