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Fabrication of a NiAl–Cr(Mo) eutectic alloy with network microstructure for high-temperature strengthening
Materials Science and Engineering: A  (IF5.234),  Pub Date : 2022-01-10, DOI: 10.1016/j.msea.2022.142628
Dongjun Wang, Hanwei Ning, Bao Wang, Gang Liu, Shijian Yuan

To improve the high temperature (up to 1100 °C) strength of NiAl-based alloy, a method of the microstructural optimization for achieving network Cr(Mo) reinforcements was proposed. A network Cr(Mo) microstructure was successfully obtained by evolution of the ultrafine lamellas in the sintering of rapid-solidified powders. As a result, the micro-sized Cr(Mo) networks are formed at the sintering necks and nano-sized Cr(Mo) networks exist inside the powders. Moreover, the Cr(Mo) phases are interconnected and their network morphology is characterized in 3D using micro-CT, as well as light optical tomography based on OM and SEM. Compared with other NiAl-based alloys, the sintered sample with network Cr(Mo) reinforcements has a considerably improved strength at high temperature. Based on detailed TEM analysis, the high temperature strengthening mechanism is discussed and the proposed network microstructure for NiAl-based alloy can provide synergetic strengthening effect, which is beneficial for achieving enhanced high temperature strength.