Mechanical properties of advanced nickel aluminides [Book Chapter]

Conference · Tue Sep 17 00:00:00 EDT 1991 · High Temperature Aluminides and Intermetallics: Proceedings of the Second International ASM Conference on High Temperature Aluminides and Intermetallics

DOI:https://doi.org/10.1016/B978-1-85166-822-9.50022-4· OSTI ID:5908275

Alexander, D. J. ^[1]; Sikka, V. K. ^[1]

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1. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

The mechanical properties of two nickel aluminide alloys have been studied over a range of temperatures. Testing included tensile, impact, and fracture toughness testing. The wrought alloy was studied in cold-worked and cold-worked plus annealed conditions. The cast alloy was studied in the as-cast condition. At room temperature, the annealed wrought alloy showed good tensile properties and fracture toughness. The cold-worked material had much higher strength, but the fracture toughness was reduced. At 650 °C both the cold-worked and the annealed conditions showed reduced toughness. The cast alloy showed acceptable tensile properties and fracture toughness at room temperature, and good tensile properties at 650 °C. However, the fracture toughness was reduced at the higher temperature. Impact testing showed relatively little effect of temperature. Intergranular fracture for the wrought alloy, and interdendritic fracture for the cast material were found to be responsible for the low toughness observed at 650 °C. The availability of oxygen to the freshly exposed metal at the strained crack tip is believed to cause oxygen embrittlement of the grain boundaries, and thus intergranular fracture for the wrought alloy, and interdendritic failure for the cast material.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Industrial Efficiency & Decarbonization Office (IEDO)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5908275
• Report Number(s): CONF-910938--8; ON: DE92006853
• Journal Information: High Temperature Aluminides and Intermetallics: Proceedings of the Second International ASM Conference on High Temperature Aluminides and Intermetallics, Journal Name: High Temperature Aluminides and Intermetallics: Proceedings of the Second International ASM Conference on High Temperature Aluminides and Intermetallics
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE