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Mechanical properties of Al2O3-Cr2O3/Cr3C2 nanocomposite fabricated by spark plasma sintering |
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| Authors: | Hao-Tung LinPramoda K Nayak Bo-Zon LiuWei-Hsio Chen Jow-Lay Huang |
| Affiliation: | a Electrical Technology Center, Cheng Shiu University, Kaohsiung County 833, Taiwan b Department of Materials Science and Engineering, National Cheng-Kung University, Tainan 701, Taiwan c Center for Micro/Nano Science and Technology, National Cheng Kung University, Tainan 701, Taiwan d Research Center for Energy Technology and Strategy, National Cheng Kung University, Tainan 701, Taiwan |
| Abstract: | The fine grains of Al2O3-Cr2O3/Cr-carbide nanocomposites were prepared by employing recently developed spark plasma sintering (SPS) technique. The initial materials were fabricated by a metal organic chemical vapor deposition (MOCVD) process, in which Cr(CO)6 was used as a precursor and Al2O3 powders as matrix in a spouted chamber. The basic mechanical properties like hardness, fracture strength and toughness, and the nanoindentation characterization of nanocomposites such as Elastics modulus (E), elastic work (We) and plastic work (Wp) were analyzed. The microstructure of dislocation, transgranular and step-wise fracture surface were observed in the nanocomposites. The nanocomposites show fracture toughness of (4.8 MPa m1/2) and facture strength (780 MPa), which is higher than monolithic alumina. The strengthening mechanism from the secondary phase and solid solution are also discussed in the present work. Nanoindentation characterization further illustrates the strengthening of nanocomposites. |
| Keywords: | Al2O3 Spark plasma sintering Nanocomposites Mechanical properties Nanoindentation |
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