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HomeAdvanced Engineering ForumAdvanced Engineering Forum Vol. 15Effect of Relative Density and Strain Rate on the...

Effect of Relative Density and Strain Rate on the Deformation Behaviour Ni-Ti Foam Made through Powder Metallurgy Route Using NH₄(HCO₃) as Space Holder

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Abstract:

Ni-Ti foams of varying relative densities have been made by varying the size and volume fraction of NH₄(HCO₃), which was used as space holder. The green compacted pellets, after evaporation of NH₄(HCO₃), were sintered at 1100°C for 2 hrs. The XRD and EDX analysis confirms that there is no residual space holder. The extent of openness of cell walls increases with increase in porosity. The compressive stress-strain behavior of these foams varies with the relative density. The peak stress and energy absorption of these foam increases with relative density following power law and linear relationships respectively, and the densification strain decreases with relative density following a linear relationship. The pseudo elastic recovery strain and shape recovery strain decrease with increase in porosity. The overall recovery increases with decrease in degree of deformation. This phenomenological behavior indicates that these foams can be used for their shape memory effect.

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Advanced Engineering Forum Vol. 15

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Periodical:

Advanced Engineering Forum (Volume 15)

Pages:

35-55

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https://doi.org/10.4028/www.scientific.net/AEF.15.35

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Online since:

February 2016

Authors:

D.P. Mondal*, Ajay Kumar Barnwal, Rupa Dasgupta, A.N.Ch. Venkat

Keywords:

Deformation Behavior, Energy Absorption, Ni-Ti Foams, Sintering, Space Holder

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© 2016 Trans Tech Publications Ltd. All Rights Reserved

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