The effect of directional solidification parameter on the structure and property of Ni{sub 50}Al{sub 20}Fe{sub 30}
Journal Article
·
· Scripta Metallurgica et Materialia
- Academia Sinica, Shenyang (China). Institute of Metal Research
The authors have found that the directional solidification parameters affect the structure and properties of Ni{sub 50}Al{sub 20}Fe{sub 30} markedly. When the pulling rates are >0.19mm/min, coarse dendritic pro-eutectic {beta} phase with interdendritic {gamma} phase surrounded by eutectic area structure is formed. When the pulling rates are {le}0.19mm/min, completely eutectic lamellae structure is formed. Primary dendrite arm spacing, thickness of {beta} lamellae and thickness of the {gamma} lamellae increase with decreasing pulling rate. The yield stress and fracture stress decrease slightly with decreasing pulling rate. An anomalous decrease of the {gamma} lamellae thickness nd increase of the yield stress with decreasing pulling rate occur, which are caused by the chance from dendritic solidification to the planar solidification process. Fracture mode changes with different microstructure. The directionally solidified samples with dendritic structure exhibit the high ductility. The easy load transfer from the pro-eutectic area to the eutectic area and plastic deformation of the interdendritic {gamma} phase together with the appearance of thick interdendritic {gamma} phase and a relatively thicker lamellae {gamma} phase induces the higher ductility.
- OSTI ID:
- 103583
- Journal Information:
- Scripta Metallurgica et Materialia, Journal Name: Scripta Metallurgica et Materialia Journal Issue: 4 Vol. 33; ISSN SCRMEX; ISSN 0956-716X
- Country of Publication:
- United States
- Language:
- English
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