135°周向轧制对高纯铌组织均匀性的优化  

Optimization of 135°Clock-Rolling for Microstructure Uniformity of High-Purity Niobium

作　　者：曹招 谭敦强[1] 唐晔 冯美兵 朱芳 刘俊荣 聂腾飞 朱楹楹 侯肖 Cao Zhao;Tan Dunqiang;Tang Ye;Feng Meibing;Zhu Fang;Liu Junrong;Nie Tengfei;Zhu Yingying;Hou Xiao(College of Physics and Materials,Nanchang University,Nanchang 330031,China;Jiujiang Tanbre Co.,Ltd,Jiujiang 332014,China)

机构地区：[1]南昌大学物理与材料学院,江西南昌330031 [2]九江有色金属冶炼有限公司,江西九江332014

出　　处：《稀有金属材料与工程》2022年第5期1705-1712,共8页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51564036);江西省重点研发计划(20192BBE50034)。

摘　　要：传统工业上获取铌板多采用单向轧制(unidirectional rolling,UR),该工艺下获得的铌板在晶粒尺寸和织构分布上常表现出强烈的不均匀性,导致其在现代工业的使用上具有一定局限性。本实验采用135°周向轧制(135°clock-rolling,CR)和单向轧制获得铌板,研究了2种工艺条件下获得的铌板在厚度方向上的组织差异。结果表明,135°周向轧制有助于减小高纯Nb板材在厚度方向上的织构梯度。此外,135°周向轧制工艺条件下可以获得具有更高{001}<uvw>择优取向程度的铌板,且再结晶后,仍然具有较强的{001}<uvw>择优取向,该织构的占优有助于获得微观组织更均匀的铌板,本实验的显微硬度曲线、再结晶显微组织表征、储存能的半定量计算结果都印证了这一点。还有一点值得注意,相比于单向轧制,135°周向轧制下获得的Nb板材在厚度方向上{111}、{100}取向的储存能差异较小,不会显示明显的能量梯度,这一点同样有助于对高纯铌组织均匀性的优化。In traditional industries,niobium plates are usually obtained by unidirectional rolling.The niobium plates obtained by unidirectional rolling often show strong unevenness in grain size and texture distribution,which restricts their use in modern industries.In this experiment,135°clock rolling and unidirectional rolling were used to obtain niobium plates,and the differences in the thickness direction of the niobium plates obtained under the two process conditions were studied.The results show that 135°clock rolling can help reduce the texture gradient of the high-purity niobium sheet in the thickness direction.In addition,niobium plates with a higher degree of{001}<uvw>preferred orientation can be obtained under the conditions of 135°clock rolling process,and after recrystallization,they still have a strong{001}<uvw>preferred orientation.The dominance of this texture helps to obtain a more uniform niobium plate,which is confirmed by the microhardness curve,microscopic characterization of recrystallized structure,and semi-quantitative calculation results of storage energy in this experiment.It is also worth noting that compared to unidirectional rolling,the niobium plate obtained under 135°clock rolling has a smaller difference in the storage energy of{111}and{100}orientations in the thickness direction,and does not show a significant energy gradient.This also helps to optimize the uniformity of high-purity niobium.

关 键 词：高纯Nb 135°周向轧制 织构 储存能 

分 类 号：TG146.416[一般工业技术—材料科学与工程]