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Fracture of Metals

Author: Rostoker, W.
Corporate Author: Armour Research Foundation
Corporate Report Number: ARF-B183-12
Date of Publication: 1962-11-19
Pages: 41
Contract: DA 11-ORD-022-3108
AD Number: AD0294459
Original AD Number: AD-294 459

Research results show that the mercury embrittlement of an Al-4 1/2 Mg alloy is related to the strain-aging behavior of this alloy and that strain aging produces embrittlement effects which are similar to precipitation hardening. The temperature dependence of stress-corrosion cracking is shown in two cases to be small compared to that expected for corrosion processes and more closely comparable to that encountered in liquid-metal embrittlement. There is also shown to be a close similarity between liquid metal and stress-corrosion cracking in their strong dependence on small degrees of plastic prestrain. Evidence is presented in terms of kinetics and appearance of intergranular penetration without external application of stress to suggest that large stresses exist between grains of an age-hardened polycrystalline aluminum alloy.

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