| RESEARCH PAPER |
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| Preparation and Mechanical Response Characteristics of TiAl Foam with Innovative Configuration |
| HAO Gangling, XU Qiaoping
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| Institute of Material Physics, Yan’an University, Yan’an 716000 |
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Abstract There are incontrovertible performance advantage and objective demand for TiAl intermetallic compound foam materials with metal and ceramic properties, which has a wide application prospect in the fields of high temperature insulating material, filter material in acid-base environment, catalyst carrier etc. The TiAl alloy powder in the present study was firstly fabricated using the Ti/Al elemental power sintering. Then the open pore TiAl foam with single structure was prepared using the dissolution-sintering method. The TiAl foam has a well uniform pore distribution and the porosity, pore size and pore shape can be tailored according to the desirable demand. The quasi-static compression was carried out to characterize the mechanical properties of the TiAl foam. It was found that the TiAl foam belongs to typical brittle foam material. However, the TiAl will completely collapsed and become invalid once the compressive stress exceeds the upper yield strength after linear elastic region. Moreover, the yield strength, Young’s modular, elastic region of the TiAl foam decrease with increasing the porosity. The relationship between yield strength and porosity coincides well with the Gibson-Ashby model.
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Published: 06 July 2018
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2018, Vol. 32 
