Abstract
Abstract Thermal stability of the fine-crystal Cr-NbCr2 alloy prepared by mechanical alloying and hot pressing was researched. The results show that the grain size of Cr matrix has a certain degree of growing up after the thermal exposure, while the particle size of Laves phase NbCr2 has no obvious change due to its high thermal stability. At the same time, the dislocation in the Cr matrix and the stacking faults/twins in the Laves phase NbCr2 particles appear in the as-thermally exposed microstructure because of the increase of the compressive stress between Cr matrix and NbCr2 particles. Due to the variation in particle size and the occurrence of crystal defects, the Cr-NbCr2 alloy can keep higher compressive strength, yield strength and plastic strain after thermal exposure from 800 °C to 1200 °C for 50 h. However, the yield strength and plastic strain of the Cr-NbCr2 alloy decline obviously by prolonging the thermal exposure because the growth of grains becomes the determining factor of properties.
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