Metallurgical and Materials Transactions A

, Volume 47, Issue 3, pp 1367–1377 | Cite as

Environmentally Assisted Cracking of Alloy 7050-T7451 Exposed to Aqueous Chloride Solutions

  • Reinhold BraunEmail author


The stress corrosion cracking (SCC) behavior of 7050-T7451 plate material was investigated in short-transverse direction performing constant load and constant extension rate tests. Smooth and notched tensile specimens were permanently immersed in substitute ocean water and in an aqueous solution of 0.6 M NaCl + 0.06 M (NH4)2SO4. Alloy 7050-T7451 exhibited high SCC resistance in both synthetic environments. However, conducting cyclic loading tests, environment-induced cracking was observed. Applying a sawtooth waveform, notched tensile specimens were strained under constant load amplitude conditions at constant displacement rates ranging from 2 × 10−6 to 2 × 10−4 mms−1. The stress ratio R = σ min/σ max was 0.1 with maximum stresses of 300 and 400 MPa. When cyclically loaded in substitute ocean water, notched specimens failed predominantly by transgranular environment-induced cracking. Striations were observed on the cleavage-like facets. The number of cycles-to-failure decreased with decreasing displacement rate. A slope of 0.5 was obtained by fitting the logarithmic plot of number of cycles-to-failure vs nominal loading frequency, indicating a hydrogen embrittlement mechanism controlled by diffusion.


Stress Corrosion Crack Slow Strain Rate Testing Stress Corrosion Crack Resistance Stress Corrosion Crack Susceptibility Constant Load Test 
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© The Minerals, Metals & Materials Society and ASM International 2016

Authors and Affiliations

  1. 1.Institute of Materials ResearchDLR – German Aerospace CenterKölnGermany

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