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,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.]
细晶Cr-NbCr2合金的热稳定性
投稿时间:2017-04-14  修订日期:2017-06-06
中文关键词:  Cr-NbCr2合金  细晶  热稳定性  晶体缺陷
基金项目:
中文摘要:
      本文研究了通过机械合金化+热压工艺制备的细晶Cr-NbCr2合金的热稳定性。结果表明:热暴露过程中,Cr基体的颗粒尺寸有一定程度的长大,而Laves相NbCr2颗粒由于其高热稳定性无明显变化。随着热暴露的进行,Cr基体颗粒与Laves相NbCr2颗粒间压应力增加,使得基体和Laves相中分别出现了位错和层错/孪晶结构。所有热暴露条件下的Cr-NbCr2合金的强度均不低于热压态的。在800-1200℃热暴露50h后,Cr-NbCr2合金仍保持了较高的屈服强度和良好的塑性。但随着热暴露时间的继续延长,此时颗粒的长大成为主导因素,使得Cr-NbCr2合金的屈服强度和塑性明显下降。
Thermal stability of fine-crystal Cr-NbCr2 alloy
英文关键词:Cr-NbCr2 alloy  fine-crystal  thermal stability  crystal defects
英文摘要:
      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.
作者单位E-mail
邓莉萍 南昌航空大学 denglp790331@aliyun.com 
鲁世强 南昌航空大学  
汤斌兵 南昌大学  
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