In:
Journal of Materials Research, Springer Science and Business Media LLC, Vol. 34, No. 18 ( 2019-09), p. 3061-3070
Abstract:
The effect of off-stoichiometry on the microstructures and tensile properties of Ni 3 Al–Ni 3 V pseudo-binary alloys was investigated by a scanning electron microscope, a transmission electron microscope, Vickers hardness test, and high-temperature tensile test. As the alloy deviates from a just-stoichiometric composition toward Ni-rich one, the microstructures constituted by two ordered phases, Ni 3 Al and Ni 3 V changed to those constituted by two ordered phases, Ni 3 Al and Ni 3 V, and one disordered phase, Ni solid solution. Also, the deviation from the stoichiometric composition resulted in a decrease in flow strength as well as Vickers hardness and conversely increase in tensile elongation. Higher tensile elongation in the off-stoichiometric alloys was induced by the transition from intergranular fracturing to transgranular fracturing. The trade-off relation in the yield strength (or hardness) versus tensile elongation curve, which was drawn plotting the data obtained from the alloys with different off-stoichiometric compositions, was most excellent at 600 °C but rapidly became worse at high temperatures beyond 600 °C. It was demonstrated that the deviation to the off-stoichiometric composition in the two-phase Ni 3 Al–Ni 3 V pseudo-binary alloy system was a useful alloying parameter to improve the balance of the flow strength and tensile ductility.
Type of Medium:
Online Resource
ISSN:
0884-2914
,
2044-5326
DOI:
10.1557/jmr.2019.269
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2019
detail.hit.zdb_id:
54876-5
detail.hit.zdb_id:
2015297-8
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