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Title: Iron-aluminum alloys having high room-temperature and method for making same

Iron-aluminum alloys having selectable room-temperature ductilities of greater than 20%, high resistance to oxidation and sulfidation, resistant pitting and corrosion in aqueous solutions, and possessing relatively high yield and ultimate tensile strengths are described. These alloys comprise 8 to 9.5% aluminum, up to 7% chromium, up to 4% molybdenum, up to 0.05% carbon, up to 0.5% of a carbide former such as zirconium, up to 0.1 yttrium, and the balance iron. These alloys in wrought form are annealed at a selected temperature in the range of 700.degree. C. to about 1100.degree. C. for providing the alloys with selected room-temperature ductilities in the range of 20 to about 29%.
Inventors:
 [1];  [2]
  1. (Oak Ridge, TN)
  2. (Knoxville, TN)
Issue Date:
OSTI Identifier:
868894
Assignee:
Martin Marietta Energy Systems, Inc. (Oak Ridge, TN) ORNL
Patent Number(s):
US 5238645
Contract Number:
AC05-84OR21400
Research Org:
LOCKHEED MARTIN ENRGY SYST INC
Country of Publication:
United States
Language:
English
Subject:
iron-aluminum; alloys; room-temperature; method; selectable; ductilities; 20; resistance; oxidation; sulfidation; resistant; pitting; corrosion; aqueous; solutions; possessing; relatively; yield; ultimate; tensile; strengths; described; comprise; aluminum; chromium; molybdenum; 05; carbon; carbide; former; zirconium; yttrium; balance; iron; wrought; form; annealed; selected; temperature; range; 700; degree; 1100; providing; 29; ultimate tensile; balance iron; aqueous solution; aqueous solutions; aluminum alloy; tensile strength; selected temperature; aluminum alloys; alloys comprise; iron-aluminum alloys; /420/148/