Recent developments in aluminides and silicides
This paper summarizes recent alloy development in Ni/sub 3/Al, Ni/sub 3/Si, Fe/sub 3/Al, and Al/sub 3/Ti, alloys at ORNL. Micro- alloying with boron suppresses brittle intergranular fracture and dramatically improves ductilities of Ni/sub 3/Al and Ni/sub 3/Si with hypostoichiometric compositions. Chromium additions reduce environmental embrittlement and increase the ductility of the alloys at elevated temperatures. Alloying with chromium also reduces brittle cleavage fracture and enhances tensile ductility in Fe/sub 3/Al, alloys. Hardness measurements reveal that Al/sub 3/Ti alloys with the Ll/sub 2/ structure, stabilized by Ni, Fe, and Cu, retain their strength at high temperatures. Ductile nickel and iron aluminides and silicides developed at ORNL have the potential to be used as new engineering materials for elevated-temperature structural use. 44 refs., 12 figs., 2 tabs.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 7128412
- Report Number(s):
- CONF-880855-4; ON: TI88012926
- Country of Publication:
- United States
- Language:
- English
Similar Records
Brittle fracture and ductility improvement in nickel and iron aluminides
Current status of research and development on nickel and iron aluminides
Related Subjects
360101* -- Metals & Alloys-- Preparation & Fabrication
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
CORROSION RESISTANCE
DUCTILITY
ELONGATION
EMBRITTLEMENT
FRACTURE PROPERTIES
IRON ALLOYS
MECHANICAL PROPERTIES
MELTING POINTS
NICKEL ALLOYS
PHYSICAL PROPERTIES
SILICON ALLOYS
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES
THERMODYNAMIC PROPERTIES
TITANIUM ALLOYS
TRANSITION TEMPERATURE