High temperature compression properties of open-cell Ni–20Cr foams produced by impregnation

• Published in: Materials & design 2015-11, Vol.85, p.47-53
• Main Authors: Xiao, Lijun, Song, Weidong, Tang, Huiping, Zhu, Zhiwu, Wang, Jianzhong, Wang, Hui
• Format: Article
• Language: English
• Subjects: Compression; Compressive properties; Compressive strength; Constitutive model; Foams; Impregnation; Mathematical models; Mechanical properties; Nickel; Open-cell Ni–20Cr foam; Strain rate; Stress-strain relationships; Temperature
• ISSN: 0264-1275; 1873-4197
• DOI: 10.1016/j.matdes.2015.06.167

The mechanical properties of open-cell Ni–20Cr foams were studied by uniaxial compression tests, which were performed at a strain rate of 10−3s−1 at ambient temperature, 250°C, 400°C and 550°C respectively. Then, the effect of temperature on the mechanical properties of these foams was analyzed. It was found that both the compressive strength and energy absorbed by Ni–20Cr foam at elevated temperatures became lower than those at room temperature. The compressive strength changed with temperatures in a form of parabola, which satisfied the model derived from Gibson–Ashby model combined with Kocks' kinetic model. A multi-parameter phenomenological elasto-plastic constitutive model was modified to take the temperature effect into consideration. The relationships between model parameters and temperature were determined. The fitting stress–strain curves of the model were in good agreement with the experimental results. [Display omitted] •A kind of Ni–Cr alloy foam is prepared by organic foam impregnation.•The yield strength of Ni–20Cr foam is in a parabola form with temperature.•The energy absorbed by Ni–20Cr foam decreases with increasing temperature.•A multi-parameter elasto-plastic constitutive model is proposed.•The dependency of model parameters on temperature is determined.