Effect of pore structure on the compressive property of porous Ti produced by powder metallurgy technique |
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| Affiliation: | 1. Liaoning Key Materials Laboratory for Railway, School of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, China;2. Traffic and Transportation School, Dalian Jiaotong University, Dalian 116028, China;1. Graduate School of Science and Technology, Gunma University, Kiryu 376-8515, Japan;2. Institute of Industrial Science, The University of Tokyo, Tokyo 153-8505, Japan;1. Laboratory of Energetics and of Theoretical and Applied Mechanics, University of Lorraine, 54500 Vand?uvre-lès-Nancy, France;2. French Environment and Energy Management Agency ADEME, 49000 Angers, France;1. Beijing Key Laboratory of Materials Utilization of Non-metallic Minerals and Solid Waste, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing, 100083, China;2. School of Engineering and Technology, China University of Geosciences (Beijing), Beijing, 100083, China;1. School of Materials Science and Engineering, Beihang University, Beijing 100191, China;2. Key Laboratory of Aerospace Advanced Materials and Performance (Beihang University), Ministry of Education, Beijing 100191, China |
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| Abstract: | Porous Ti with an average macro-pore size of 200–400 μm and porosity in the range of 10–65% has been manufactured using polymethyl methacrylate (PMMA) powders as spacer particles. The compressive strength and elastic modulus of resultant porous Ti are observed in the range of 32–530 MPa and 0.7–23.3 GPa, respectively. With the increasing of the porosity and macro-pore size, the compressive strength and modulus decrease as described by Gibson–Ashby model. The failure due to cracking (complete fracture) of the struts on porous Ti is controlled primarily by macro-pores. Fractography shows evidence of the brittle cleavage fracture mainly, but containing a few fine shallow dimples and a small amount of transcrystalline fracture of similarly oriented laths. The failure mechanism has been discussed by taking the intrinsic microstructural features into consideration. |
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| Keywords: | Porous titanium Powder metallurgy Pore structure Compressive property Fracture |
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