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邓莉萍,鲁世强,汤斌兵.细晶Cr-NbCr2合金的热稳定性[J].稀有金属材料与工程(英文),2018,47(1):7~12.[Deng Liping,Lu Shiqiang,Tang Binbing.Thermal stability of fine-crystal Cr-NbCr2 alloy[J].Rare Metal Materials and Engineering,2018,47(1):7~12.]
Thermal stability of fine-crystal Cr-NbCr2 alloy
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Received:April 14, 2017  Revised:June 06, 2017
Key words: Cr-NbCr2 alloy  fine-crystal  thermal stability  crystal defects
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Author NameAffiliationE-mail
Deng Liping Nanchang Hongkong University denglp790331@aliyun.com 
Lu Shiqiang 南昌航空大学  
Tang Binbing 南昌大学  
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      Thermal stability of 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 particles 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. The as-thermally exposed compressive strength is not lower than the as-hot pressed strength. The Cr-NbCr2 alloy can still keep higher yield strength and plastic strain after thermal exposure from 800℃ to 1200℃ for 50h. However, the yield strength and plastic strain will decline obviously by further extending the thermal exposure time because of the increase of the grain size.