Accession Number : ADA622903


Title :   Sensitization of Naturally Aged Aluminum 5083 Armor Plate


Descriptive Note : Memorandum rept. Dec 2010-Dec 2014


Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC MATERIALS SCIENCE AND TECHNOLOGY DIV


Personal Author(s) : Holtz, Ronald L ; Goswami, Ramasis ; Pao, Peter S


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a622903.pdf


Report Date : 29 Jul 2015


Pagination or Media Count : 10


Abstract : A sample of aluminum armor plate, approximately 40 to 50 years old, containing a large intergranular stress corrosion crack was evaluated. Scanning electron microscopy examination of the fracture surfaces is consistent with intergranular stress corrosion cracking and some evidence of variable environmental and stress history is noted. ASTM G-67 nitric acid mass-loss values were 19 to 25 mg/cm2. The transmission electron microscopy microstructure of the sample was found to be consistent with sensitization due to aging at low temperatures for a long time. The grain boundary magnesium-rich phase is continuous, although non-uniform, and only 10 to 15 nm thick.


Descriptors :   *ALUMINUM , *ARMOR PLATE , *SENSITIZING , *STRESS CORROSION , AGING(MATERIALS) , CRACKING(FRACTURING) , GRAIN BOUNDARIES , LOW TEMPERATURE , MASS , MICROSTRUCTURE , NITRIC ACID , NONUNIFORM , SCANNING ELECTRON MICROSCOPY , THICKNESS , TRANSMISSION ELECTRON MICROSCOPY


Subject Categories : Properties of Metals and Alloys
      Mfg & Industrial Eng & Control of Product Sys
      Armor


Distribution Statement : APPROVED FOR PUBLIC RELEASE