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Xiao L.,Beijing Institute of Technology | Song W.,Beijing Institute of Technology | Tang H.,Northwest Institute for Nonferrous Metal Research | Zhu Z.,Southwest Jiaotong University | And 2 more authors.
Materials and Design | Year: 2015

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. © 2015 Elsevier B.V. Source


Wang H.,Northwest Institute for Nonferrous Metal Research | Wang H.,Xian Sailong Metal Materials Co. | Jia W.-P.,Northwest Institute for Nonferrous Metal Research | Jia W.-P.,Xian Sailong Metal Materials Co. | And 10 more authors.
Fenmo Yejin Cailiao Kexue yu Gongcheng/Materials Science and Engineering of Powder Metallurgy | Year: 2013

TiAl pre-alloyed powder with nominal composition of Ti-47Al-2Cr-2Nb-0.2W (atom fraction, %) was prepared by plasma rotating electrode atomizing process, and then hot isostatic pressed to obtain high quality ingot. The high temperature mechanical properties of TiAl based alloys were studied after the ingot had been canned-forged with temperature in the range of 1 150~1 200°C and strain rate in the range of 0.1~0.01 s-1. The results show that the high temperature mechanical properties of such alloy increase due to the refining and homogenization of the microstructure after canned-forging, while the elongation is still not high enough due to the existence of micro-cracks. When high temperature tensile tests are conducted, the micro-cracks or micro-pores occurred in the test samples will expand and connect during tensile process which results in the rupture of the samples. Source


Wang H.,Northwest Institute for Nonferrous Metal Research | Wang H.,Xian Sailong Metal Materials Co. | Tang H.,Northwest Institute for Nonferrous Metal Research | Tang H.,Xian Sailong Metal Materials Co. | And 9 more authors.
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2014

The Ni-20Cr foam filter with gradient pore structure was prepared by impregnating using polyurethane foams as templates. The effects of sintering temperature and loading mode on mechanical properties of Ni-Cr foam were studied. Also mechanical property and gas permeability of two-step sintered Ni-Cr foam filter were tested. The results show that Ni-Cr foam filter with gradient pore structure can be obtained after two-step sintering. The Ni-Cr foam has a reticulated structure composed of open, interconnected pores and uniform framework structure as well as good bonding at gradient pore interface. The yield strength of such foam is above 3 MPa, and with the increase of coating amount it could reach to 4.43 MPa. Due to higher porosity, bigger pore size and gradient pore structure, the differential pressure of Ni-Cr foam filter at the same gas flow rate is much less than that of traditional porous metal filter. Copyright © 2014, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved. Source

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