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Pore Structure and Compressive Properties of Open-Cell Aluminum Foams Prepared by Infiltration Casting Based on NaCl Space-Holder
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1.School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, China;2.School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;3.Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Tsinghua University, Beijing 100084, China

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National Natural Science Foundation of China (51771101)

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    Abstract:

    Nearly spherical NaCl particles prepared by a disc granulator were used to produce open-cell aluminum foams via infiltration casting. The average compressive strength of the salt balls is 3.9 MPa, and they can be completely collapsed within 5 min in the ultrasonic cleaner. By controlling the hot-pressure sintering duration as 0.5?2 h and the hot-pressing temperature at 700 °C, the preforms with bulk density of 0.66?0.83 g/cm3 can be prepared. Prolonging the duration of hot-pressure sintering can increase the pore size of the open-cell aluminum foams from 0.48 mm to 1.16 mm, and also increase the porosity from 64% to 82%. Compression test results show that the macroscopic deformation characteristics of the foams with different pore structures are basically the same, and they all exhibit the deformation characteristic of layer-by-layer collapse. In addition, the densification strain value, elastic modulus, plateau yield stress, and energy absorption capacity of open-cell aluminum foams are al decreased with increasing the porosity. The energy absorption capacity is the largest (15.0 MJ·m-3) when the porosity is 64%.

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[Wang Zhaoming, Liu Yuan, Xu Fating, Wan Tan, Jin Yunxue. Pore Structure and Compressive Properties of Open-Cell Aluminum Foams Prepared by Infiltration Casting Based on NaCl Space-Holder[J]. Rare Metal Materials and Engineering,2023,52(1):119~124.]
DOI:10.12442/j. issn.1002-185X.20220365

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History
  • Received:April 28,2022
  • Revised:May 21,2022
  • Adopted:May 26,2022
  • Online: February 09,2023
  • Published: February 08,2023