Microstructure and mechanical properties of nickel aluminide powders consolidated by extrusion and hot isostatic pressing
The influence of alloying additions of iron and chromium, alone and in combination with molybdenum and zirconium, on the heat treatment response and mechanical properties of powder metallurgy Ni{sub 3}Al based materials consolidated by hot extrusion has been characterized in detail. Consolidation of the nickel aluminide powders by hot isostatic pressing (HIP) has been examined as an alternative to extrusion. Densification has been simulated using a model that describes consolidation by the additive effects of plastic flow, power-law creep, boundary diffusion, and Nabarro-Herring and Coble creep. The model has been used to develop maps that describe densification for any combination of time, temperature, and pressure. The best available material property data and parameters from experiments have been used to develop maps that describe HIP consolidation experiments with reasonable accuracy. Finite element models were developed as an extension of the HIP map approach to provide detailed simulations of particle deformation during densification. Preliminary results for both monosized and bimodal particle distributions indicate that this particle level approach is useful for simulating microstructural development resulting from different combinations of consolidation parameters. 45 refs., 22 figs., 22 figs., 4 tabs.
- Research Organization:
- EG and G Idaho, Inc., Idaho Falls, ID (United States)
- Sponsoring Organization:
- DOE/FE
- DOE Contract Number:
- AC07-76ID01570
- OSTI ID:
- 7035465
- Report Number(s):
- EGG-MS-8865; ON: DE90009777
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINIUM ALLOYS
MECHANICAL PROPERTIES
CHROMIUM ALLOYS
IRON ALLOYS
NICKEL BASE ALLOYS
ANNEALING
DUCTILITY
EXTRUSION
GRAIN SIZE
HOT PRESSING
METALLURGICAL EFFECTS
MICROSTRUCTURE
MOLYBDENUM ADDITIONS
PHASE TRANSFORMATIONS
POWDERS
PRESSURE EFFECTS
TEMPERATURE EFFECTS
ZIRCONIUM ADDITIONS
ALLOYS
CRYSTAL STRUCTURE
FABRICATION
HEAT TREATMENTS
MATERIALS WORKING
MOLYBDENUM ALLOYS
NICKEL ALLOYS
PRESSING
SIZE
TENSILE PROPERTIES
ZIRCONIUM ALLOYS
360103* - Metals & Alloys- Mechanical Properties
360102 - Metals & Alloys- Structure & Phase Studies
360101 - Metals & Alloys- Preparation & Fabrication