Journal
COMPOSITES PART B-ENGINEERING
Volume 229, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2021.109457
Keywords
NiAl-based composites; 3-Dimensional network structure; Strength-ductility synergy; Strengthening and toughening mechanisms
Funding
- National Natural Science Foundation of China [51675126, 52175297]
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A novel 3-dimensional network structure-reinforced NiAl-based composite was designed and prepared in this study, with a microstructure containing desirable distribution of the 3-dimensional network structure and the best mechanical properties obtained by controlling sintering temperature and time. The strengthening and toughening mechanisms were discussed in detail.
NiAl intermetallic compounds have attracted the attention of researchers in the field of high-temperature structural materials, but their poor room-temperature ductility and insufficient high-temperature strength crying out for solutions have hindered their practical application. To solve these problems, a novel 3-dimensional network structure-reinforced NiAl-based composite was designed by hot presing sintering sinter with pre-alloyed powders. The 3-dimensional network structure was composed of discrete nearly spherical HfO2 and rod-shaped HfRe2. The mechanical properties of the composites were closely correlated with the distribution of the 3-dimensional network structure in the matrix, which was controlled by the sintering temperature and holding time. A microstructure with a desirable 3-dimensional network structure distribution and the best comprehensive mechanical properties was produced at 1375 degrees C/60 min. The microstructural evolution along with the strengthening and toughening mechanisms were discussed in detail. The increase in the high-temperature strength was mainly attributed to the pinning effect of the 3-dimensional network structure on dislocations and the restraining effect on the sliding and rotation between the matrix grains, while the increase in room-temperature ductility was mainly due to the grain refinement and hindering of crack propagation by the 3-dimensional network structure. In this paper, the development of a novel low-density NiAl-based composite with a 3-dimensional network structure improved both the strength and ductility, providing design ideas for the application of NiAl-based materials.
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