|
|||||
|
|
Processing, microstructure and properties of C40 Mo(Si,Al)2/Al2O3 composites |
|
| Authors: | P V Krakhmalev E Strm M Sundberg C Li |
| Affiliation: | a Department of Materials Science and Engineering, Chalmers University of Technology, S-412 96, Gothenburg, Sweden b KANTHAL AB, Box 502, S-734 27, Hallstahammar, Sweden |
| Abstract: | The C40 Mo(Si0.75Al0.25)2/Al2O3 composites were prepared by spark plasma sintering (SPS) of mechanically alloyed (MA) powders. The Mo(Si0.75Al0.25)2/0–20 vol.% Al2O3 materials, showing micron and submicron composite structure, possess a hardness of 13.9–14.6 GPa but a poor toughness of 1.78–1.80 MPa m1/2. The addition of 30 vol.% Al2O3 leads to the formation of the micron C40 Mo(Si0.75Al0.25)2/Al2O3 composite with an intergranular distribution of Al2O3, that results in a drop of the hardness to 10.2 GPa and an improvement of the toughness to 3.67 MPa m1/2. The transition of the cleavage facets to the intergranular fracture with the addition of Al2O3 is assumed as the main toughening mechanism. |
| Keywords: | Mechanical alloying Spark plasma sintering Mo(Si0 75Al0 25)2/Al2O3 intermetallic compound Microstructure Hardness Indentation toughness |
| 本文献已被 ScienceDirect 等数据库收录！ | |